JP6281876B2 - Exercise device evaluation system and exercise device evaluation method - Google Patents

Description

  The present invention relates to an exerciser evaluation system and an exerciser evaluation method.

  In Japan, which has become an aging society, the increase in the number of supporters and care recipients whose independence has fallen due to bedridden has become a social problem. There are various factors leading to fall under the category of support / care required, such as musculoskeletal disorder, cerebrovascular disorder, dementia, weakness, etc. Among them, musculoskeletal disorder is the biggest factor in 2011 It is made clear by the Ministry of Health, Labor and Welfare's National Life Basic Survey.

  An exercising device is a general term for organs that support and move the body, such as muscles, bones, joints, cartilage, intervertebral discs, ligaments, spines, spinal cords, tendons, and peripheral nerves. The musculoskeletal disorders are roughly divided into two, and one is a disease of the musculoskeletal itself such as a fracture, osteoporosis, osteoarthritis, and osteoarthritis. The other is dysfunction of motor organs such as muscle weakness, endurance decline, skillfulness, and deep sensation.

  Such a state in which there is a high risk of needing assistance or needing care due to a musculoskeletal disorder is called locomotive syndrome. Japan has entered an era of aging society in the world, and the era of continuing to use exercise equipment for a long time has come. Locomotive syndrome is attracting attention as a new national disease following metabolic syndrome (visceral fat syndrome). (See Non-Patent Document 1)

  Therefore, the Japanese Orthopedic Association currently recommends a start-up test for the purpose of grasping the risk corresponding to locomotive syndrome in the future. The standing-up test is to examine the leg strength of the subject by testing whether he can stand up from a certain height on both feet or one foot.

  Specifically, a table having a height of 10, 20, 30, 40 cm is prepared, and the subject first sits with his arms crossed on the 40 cm table. The subject then tests whether he can stand up and hold his / her position with both feet without recoil. If the subject is able to stand and stand up with both feet, then test whether the left and right feet can be raised and the other foot can stand up and keep standing. If both the left and right are successful, move to the lower level by 10 cm and repeat the test. And the height of the lowest stand which can stand up with one leg on both right and left is taken as the measurement result.

  On the other hand, if the subject was unable to stand up on either the left or right foot on the 40 cm base, move to a lower base by 10 cm and test whether he can stand up and keep standing without rebounding with both feet. repeat. And the height of the lowest stand which can stand up with both feet is made into a measurement result.

  The subject compares the measurement result with a standard corresponding to his / her age. The standard of measurement results is determined by age. For example, the standard for men aged 20-29 is one leg / 20 cm, the standard for a female aged 20-29 is one leg / 30 cm, and the standard for a male aged 70 and over is 10 cm for both legs. When the measurement result matches or is better than the standard, the subject maintains the leg strength corresponding to the age and determines that the risk of falling into the future locomotive syndrome is low. On the other hand, when the measurement result is worse than the standard, it is determined that the leg strength corresponding to the age cannot be maintained and the risk of falling into the future locomotive syndrome is high.

Nakamura, “Locomotive Syndrome”, Journal of the Japan Geriatrics Society, July 2012, Vol. 49, No. 4, p. 4-7

  Prevention of locomotive syndrome is indispensable for realizing a quality life in the future, and a method for quantitatively evaluating the risk corresponding to locomotive syndrome is required. However, the conventional standing-up test only prepares the stands with different heights and tests whether the subject succeeds in standing up from each stand, and shows a quantitative evaluation value for each subject. It is not a thing. That is, the conventional start-up test cannot quantify the state of the subject's exerciser.

  The standing-up operation refers to an operation of shifting from a seated state to a standing-up state, and then stabilizing and maintaining the standing posture. In addition, the period from when the subject is seated to when the standing posture is stabilized after standing up and standing may be referred to as a rising motion period.

  Further, in the conventional start-up test, the start-up operation must be performed a plurality of times, which places a heavy burden on the subject. In particular, in the case of an elderly person, the burden of standing up is larger than that of a young person, and if multiple tests are required, there is a risk of falling due to fatigue.

  An object of the present invention is to provide an exerciser evaluation system and an exerciser evaluation method capable of quantifying the state of the exerciser of the subject and reducing the burden on the subject in view of the above problems. And

  Stand-up motion requires a large joint torque and accurate balance control, as it requires moving the body's center of gravity from the seating surface to the back of both feet and simultaneously moving the body upward. On the other hand, it is also a basic and important operation in daily life. The inventors of the present invention paying attention to such a standing motion, and having performed a standing motion for a plurality of subjects and measuring various parameters, found that a tendency specific to the standing motion appears. .

  In view of this, the present inventors considered defining a new index based on the standing-up motion, and further considered whether it is possible to evaluate the state of the exerciser using this index. That is, if the state of the exercising device is different, it is considered that there is a difference in the newly defined index.

Under such consideration, the exerciser evaluation system of the present invention is
The load during the rising operation period from when the subject is seated with both feet placed on the detector to when the subject stands up and stands on the detector until the standing posture stabilizes, and the load A first calculation unit for calculating a barycentric coordinate which is a coordinate on the detector of the action point of
Based on the change in the center-of-gravity coordinates during the rising motion period, a first index representing the balance ability of the subject is calculated, and based on the change in the load during the rising motion period, the subject motion A second calculator for calculating a second index representing agility of
And a third calculation unit that calculates a third index for evaluating the subject's exercise device using the first index and the second index.

  The present inventors not only control the musculoskeletal system such as lower limb muscle strength, but also control the sensory system such as vision, vestibule, somatic sensation, and nervous systems such as the central nerve and peripheral nerve. Focusing on the fact that the control of the musculoskeletal system is also necessary, we considered defining an index for evaluating the exercising device from these viewpoints. Then, as an index representing the three control abilities of the musculoskeletal system, sensory system, and nervous system, a first index that represents the balance ability of the subject and a second index that represents the agility of the subject's movement We have invented a technique to newly define and calculate a new index (third index) for evaluating the exercise device from the first index and the second index. According to the above system, the third index for evaluating the exercising device is calculated using the two indexes related to the control of the rising motion. Thereby, since a 3rd parameter | index is quantified, a quantitative exercise machine evaluation system is realizable.

  The rising motion period is a period from the time when the subject is seated with both feet placed on the detector to the time when the standing posture is stabilized after standing up and standing on the detector. is there. That is, it corresponds to a period in which one rising operation is performed. According to the above system, the subject only needs to perform the rising motion once, and is not required to perform the rising motion multiple times. Thereby, compared with the conventional standing-up test, the burden placed on the subject can be reduced.

In the above system,
The first calculation unit further calculates a centroid locus length, which is a length of a locus drawn by the centroid coordinates from the start of the rising motion period, at each time point before the end of the rising motion period,
The second calculation unit includes:
Based on the center-of-gravity coordinates, identify the time point when the subject switches from a seated state to a standing state,
The first index is calculated using a difference between the center of gravity locus length from the start to the end of the rising motion period and the center of gravity locus length from the start of the rising motion period to the specified time point. And
The second index may be calculated using at least two time points from the time point at which the load becomes minimum to the time point at which the load becomes maximum.

  Although details will be described later, the time point when the subject switches from the seated state to the standing state is the moment when the subject leaves the chair. According to the system, the second calculation unit calculates the first index representing the balance ability according to the length of the locus drawn by the barycentric coordinates from the moment when the subject leaves the chair to the end of the rising motion period. It can be calculated.

  Further, according to the above system, the second calculation unit calculates a second index representing the agility of the subject's movement based on at least two time points from the time point when the load becomes minimum to the time point when the load becomes maximum. it can.

In the above system,
The second calculation unit includes:
The reciprocal of the difference between the center of gravity trajectory length from the start to the end of the rising motion period and the center of gravity trajectory length from the start of the rising motion period to the specified time is calculated as the first index. And
The change rate of the load obtained by using at least two of the time points and the load at the at least two of the time points may be calculated as the second index.

  According to the above system, the second calculation unit calculates the reciprocal of the difference between the centroid locus length from the start to the end of the rising motion period and the centroid locus length from the start to the specified time. The first index can be calculated. In addition, the second calculation unit, based on the load change rate obtained by using at least two time points from the time point when the load becomes minimum to the time point when the load becomes maximum, and the load at least two time points, An index can be calculated.

In the above system,
The second calculation unit includes:
The reciprocal of the difference between the center of gravity trajectory length from the start to the end of the rising motion period and the center of gravity trajectory length from the start of the rising motion period to the specified time point is used as the first index. Calculate
The reciprocal of the time required from the time point when the load becomes minimum to the time point when the load becomes maximum may be calculated as the second index.

  According to the above system, the second calculation unit calculates the reciprocal of the difference between the centroid locus length from the start to the end of the rising motion period and the centroid locus length from the start to the specified time. The first index can be calculated. Further, the second calculation unit can calculate the second index by the reciprocal of the time required from the time when the load becomes the minimum to the time when the load becomes the maximum.

In the above system,
The second calculation unit may calculate the third index by integrating the first index and the second index.

In the above system,
The rising operation period may be started when the subject is seated so that the subject and the detector satisfy a certain positional relationship.

  In the conventional standing-up test, there is a problem that the physique difference of the subject tends to affect the success or failure of the standing-up operation, and the accuracy of the determination result is low. Specifically, the description will be made taking two subjects in the twenties having a height difference as an example.

  If one person is 180 cm tall and the other is 140 cm, considering the difficulty of standing up from a 20 cm base, the 180 cm subject is more difficult than the 140 cm subject. However, in the conventional standing-up test, if a 180 cm subject could not stand up from a 20-cm base on one foot, the height of the standing-up operation increased because of the relatively high height, and the standing-up might have failed. In spite of this, the subject is determined to be at high risk of falling into the future locomotive syndrome. Conversely, when a 140 cm subject can stand up from a 20 cm base on one foot, the height of the standing motion is reduced because the height is relatively low, and despite the possibility of successful standing up, The subject is determined to have a low risk of falling into the future locomotive syndrome. That is, the conventional standing-up test cannot take into account the difficulty of the subject's standing-up operation.

  On the other hand, according to the above system, the subject and the detector satisfy a certain positional relationship in the rising operation. Therefore, it is possible to equalize the difficulty level of the rising operation for each subject, and to obtain an evaluation value with higher accuracy than the conventional rising test.

In the above system,
The exercise device evaluation system includes the detector and an exercise device evaluation device,
The exercise device evaluation device is:
The first calculation unit;
The second calculation unit;
The third calculation unit;
May be included.

In addition, the exercising device evaluation method of the present invention includes:
The load during the rising operation period from when the subject is seated with both feet placed on the detector to when the subject stands up and stands on the detector until the standing posture stabilizes, and the load A first calculation step of calculating a barycentric coordinate which is a coordinate on the detector of the action point of
Based on the change in the center-of-gravity coordinates during the rising motion period, a first index representing the balance ability of the subject is calculated, and based on the change in the load during the rising motion period, the subject motion A second calculating step for calculating a second index representing the agility of
A third calculation step of calculating a third index for evaluating the subject's exercising device using the first index and the second index;
And an evaluation step for evaluating the exercise device of the subject based on the third index.

  According to the above method, it is possible to realize an exerciser evaluation method that can quantify the state of the exerciser and reduce the burden on the subject.

It is a block diagram which shows typically the structure of one Embodiment of the exerciser evaluation system of this invention. It is a figure which shows typically the XY coordinate system defined on a detector. It is an example of the locus | trajectory which the gravity center of a subject (young person) draws in standing up operation. It is an example of the graph showing each time change of the load P, the gravity center coordinate Y, and the gravity center locus | trajectory length D of a subject (young person) in standing-up operation. It is a figure which shows typically the evaluation method in one Embodiment of the exerciser evaluation system of this invention. It is an example of the locus | trajectory which the gravity center of a subject (elderly person) draws in standing up operation. It is an example of the graph showing each time change of the load P of a test subject (elderly person), the gravity center coordinate Y, and the gravity center locus | trajectory length D in standing-up operation. It is a figure for demonstrating the usefulness of the exerciser evaluation system which is one Embodiment of the exerciser evaluation system of this invention. It is a block diagram which shows typically the structure of 2nd embodiment of the exerciser evaluation system of this invention. It is an example of the graph showing each time change of the load P ', the gravity center coordinate Y, and the gravity center locus | trajectory length D of a subject (elderly person) in standing-up operation. It is an example of the graph showing each time change of the load P ', the gravity center coordinate Y, and the gravity center locus | trajectory length D of a subject (young person) in standing-up operation. It is a figure for demonstrating the usefulness of the exerciser evaluation system which is 2nd embodiment of the exerciser evaluation system of this invention. It is a figure for demonstrating the usefulness of the exerciser evaluation system which is 2nd embodiment of the exerciser evaluation system of this invention. It is an example of the rectangle which surrounds the locus | trajectory of a gravity center coordinate utilized with another embodiment of the exerciser evaluation system of this invention.

(First embodiment)
[Constitution]
With reference to FIG. 1, the structure of one Embodiment of the exerciser evaluation system of this invention is demonstrated. The exerciser evaluation system 100 includes a chair 110, a detector 120, and an exerciser evaluation device 130. In the present embodiment, the chair 110 and the detector 120 are configured separately, but the chair 110 may be configured integrally so as to include the detector 120.

  The height of the chair 110 can be adjusted. When the subject sits on the chair 110, the evaluator adjusts the height of the chair 110 so that the subject's shin is at a predetermined angle θ (for example, 70 degrees) with respect to the detector 120. When the height of the chair 110 is adjusted, the subject sits on the chair 110 and performs a standing motion.

  In addition, without changing the height of the chair 110, a plurality of plates having different thicknesses are prepared, and the positional relationship between the subject and the detector 120 is adjusted by installing the plates under the detector 120. You may make it do.

  The subject sits down on the chair 110 with both feet placed on the upper surface of the detector 120. Thereafter, the robot stands up and stands on the detector 120 to adjust the standing posture. The detector 120 includes a plurality of sensors (not shown) such as load cells. The sensor measures the component force of the pressure applied to the detector 120 by the subject during the rising operation. The pressure applied to the detector 120 by the subject varies with the operation of the subject. For this reason, the component force measured by each sensor also varies with the movement of the subject. The sensor measures the component of the pressure applied by the subject during the rising operation period.

  The detector 120 has an XY coordinate system as shown in FIG. FIG. 2 schematically shows the back surface of both feet of the subject. The X axis and the Y axis are orthogonal to each other in the upper surface of the detector 120 and pass through the center O of the upper surface of the detector 120, respectively.

  The detector 120 is electrically connected to the exerciser evaluation device 130. The detector 120 outputs the component force measured by each sensor and the position coordinates of each sensor to the control unit 140 of the exerciser evaluation device 130. The detector 120 and the exerciser evaluation device 130 may be connected by wireless communication such as WiFi (registered trademark), Bluetooth (registered trademark), or infrared communication. The detector 120 is configured by a device such as a force plate, a gravity center shake meter, or a health meter.

  The exerciser evaluation device 130 includes a control unit 140, a display unit 150, and an operation unit 160. The exerciser evaluation device 130 is configured by a PC, for example.

  The control unit 140 includes a CPU and a storage device (not shown), and inputs a signal from each device and outputs a signal to each device. In addition, the control unit 140 calculates a locomotive result L (hereinafter referred to as “locomo result L”) indicating a risk that the subject will fall into the future locomotive syndrome. The control unit 140 evaluates the current state of the exercise device of the subject based on the locomotive result L. Details of the Locomo results L and the control unit 140 will be described later. The Locomo results L correspond to the third index.

  The display unit 150 includes a display panel such as an LCD. Display unit 150 displays locomotive result L, an evaluation message (described later), and the like.

  The operation unit 160 is configured by a keyboard, for example. Operation unit 160 outputs an instruction to calculate locomotive result L to control unit 140. When receiving a calculation instruction from operation unit 160, control unit 140 starts a process for calculating locomotive result L. In addition, the display part 150 and the operation part 160 may be comprised integrally, for example like a touch panel.

  Next, the control unit 140 will be described. The control unit 140 includes a first calculation unit 141, a second calculation unit 142, a third calculation unit 143, and an evaluation unit 145. The first calculation unit 141 acquires the component force measured by each sensor and the position coordinates of each sensor from the detector 120. The 1st calculation part 141 performs the calculation by a predetermined calculation formula using the component force which the sensor measured. For example, the sum of component forces measured by a plurality of sensors is calculated. Hereinafter, the calculation result by this calculation formula is referred to as a load P. The load P is a force corresponding to the pressure applied to the detector 120 by the subject during the rising operation. The load P varies with the movement of the subject. The first calculation unit 141 calculates the load P during the rising operation period.

  Further, the first calculation unit 141 calculates an X coordinate and a Y coordinate of an action point (COP: Center Of Pressure) of the load P.

  For example, the first calculation unit 141 calculates the X coordinate and the Y coordinate of the action point of the load P using the component force measured by each sensor and the position coordinates of each sensor. The calculation formula for calculation is determined by the number and arrangement of sensors included in the detector 120. Since the calculation of the X coordinate and the Y coordinate of the point of application of the load P is a well-known technique, details are omitted here. Hereinafter, the action point of the load P may be referred to as the center of gravity, and the coordinates of the action point of the load P may be referred to as the center of gravity coordinates.

  The action point (that is, the center of gravity) of the load P varies with the movement of the subject. Therefore, the coordinates of the point of application of the load P (that is, the barycentric coordinates) also vary with the movement of the subject. The first calculation unit 141 calculates barycentric coordinates during the rising motion period.

  Further, the first calculation unit 141 calculates the length of the trajectory drawn by the barycentric coordinates by the rising motion (hereinafter referred to as “center of gravity trajectory length D”). Specifically, the first calculation unit 141 calculates the center-of-gravity locus length at each time before the end of the rising motion period from the start of the rising motion period. That is, the first calculation unit 141 calculates the center of gravity locus length at each time point during the rising operation period.

  FIG. 3 shows an example of a locus drawn by the barycentric coordinates. The example shown in FIG. 3 is a trajectory drawn by the barycentric coordinates from the start operation start time to the end operation. The horizontal axis in FIG. 3 is the above-mentioned X axis, and the vertical axis is the above-mentioned Y axis. The first calculation unit 141 measures the center of gravity locus length by performing line integration on the locus shown in FIG. The example shown in FIG. 3 is a locus of the center of gravity when the subject is a young person.

  As described above, the first calculation unit 141 calculates the load P and the center-of-gravity coordinates X and Y during the rising motion period, and calculates the center-of-gravity locus length D for each time point during the rising motion period. The first calculation unit 141 stores each of the load P, the barycentric coordinates X and Y, and the barycentric locus length D in association with the time point t in the rising motion period in the storage unit (not shown) of the exerciser evaluation device 130. To do.

  Returning to FIG. 1, the description will be continued. The first calculation unit 141 outputs the load P, the centroid coordinate Y, and the centroid locus length D that are associated with the time point t to the second calculation unit 142. The first calculation unit 141 does not output the barycentric coordinates X to the second calculation unit 142. This is because the second calculation unit 142 can perform calculations without using the barycentric coordinates X as described later. Note that the first calculation unit 141 may output the barycentric coordinates X to the second calculation unit 142.

  The second calculation unit 142 plots the load P acquired from the first calculation unit 141 and the time point t corresponding to the load P on the t-P coordinate, and creates a graph representing the time change of the load P. Also, a graph representing the time change of the barycentric coordinate Y is created by plotting the barycentric coordinate Y and the time t corresponding to the barycentric coordinate Y on the t-Y coordinate. Further, a graph representing the time change of the center of gravity locus length D is created by plotting the center of gravity locus length D and the time t corresponding to the center of gravity locus length D on the t-D coordinates.

  FIG. 4 shows an example of a graph representing time changes of the load P, the barycentric coordinates Y, and the barycentric locus length D during the rising motion period. In FIG. 4, the horizontal axis indicates the time point t, and the vertical axis indicates the load (kg), the barycentric coordinates (cm), and the barycentric locus length (cm). The example shown in FIG. 4 is a graph when the subject is a young person.

As shown in FIG. 4, the load P decreases when t immediately after the start-up operation starts is between 0 and t (P _min ). In the example of FIG. 4, t (P _min ) = 0.670 (s). This is because immediately after the start of the rising motion, a part of the back of both feet of the subject is temporarily separated from the detector 120 due to a reaction to the rising motion. By this reaction, the load P decreases to the minimum value _Pmin . When the recoil disappears, the force that the subject tries to stand up acts on the detector 120, so that the load P starts to increase and reaches the maximum value _Pmax . While the load P reaches the maximum value P _max from the minimum value P _min , the subject leaves the chair 110. Thereafter, the subject prepares a standing posture. Therefore, the load P converges to a constant value corresponding to the subject's weight.

The time point t (hereinafter referred to as t (Y _min )) at which the barycentric coordinate Y takes the minimum value Y _min corresponds to the moment when the subject leaves the chair 110. When the toe side of the subject's foot is the front and the heel side is the rear, t (Y _min ) is when the center of gravity is the rearmost. That is, t (Y _min ) can be defined as the moment when the subject is least stable in the standing up motion, and can be defined as the moment away from the chair 110. In the example of FIG. 4, t (Y _min ) is 0.795 (s), and when t is 0 to 0.795 (s), the subject is in a state of sitting on the chair 110 and t is 0. After .795 (s), the subject is standing on the detector 120. Note that the moment when the subject leaves the chair 110 corresponds to the time when the subject switches from the seated state to the standing state.

  As shown in FIG. 4, the center of gravity locus length D increases with the elapse of t. In particular, in the seating state where t is 0 to 0.795 (s), the center of gravity locus length D significantly increases. This is because when t is between 0 and 0.795 (s), the subject moves greatly from the sitting state to the standing state, and thus the fluctuation range of the center of gravity is large. On the other hand, in the standing state after t is 0.795 (s) or later, the center-of-gravity locus length D gradually increases. This is because after changing from the sitting state to the standing state, the subject only performs an operation of adjusting the standing posture, and the range of fluctuation of the center of gravity is small.

  The second calculation unit 142 outputs, to the display unit 150, a graph that represents changes over time of the load P, the barycentric coordinate Y, and the barycentric locus length D. The display unit 150 displays a graph as shown in FIG. An embodiment in which the graph as shown in FIG. 4 is not displayed on the display unit 150 may be used. In this case, the second calculation unit 142 does not have to create a graph of each time change of the load P, the barycentric coordinate Y, and the barycentric locus length D.

  The second calculation unit 142 extracts the following feature amount from the load P, the centroid coordinate Y, and the centroid locus length D input from the detector 120.

The second calculation unit 142 extracts the minimum value Y _min of the barycentric coordinates Y, and extracts the time point t (Y _min ) corresponding to the minimum value Y _min . Then, _{t (Y min)} at the center of gravity trajectory length D (hereinafter, taken out _{D (t (Y min))} . In addition, _{t (Y min)} from 3 seconds after _{t (Y} min) centroid trajectory length in +3 D Then, (t (Y _min ) +3) is taken out, and an index B (hereinafter referred to as B) representing balance ability is calculated by the following equation, where the index B corresponds to the first index.

As described above, t (Y _min ) can be defined as the moment when the subject leaves the chair 110. Further, t (Y _min ) +3 can be defined as the time when the rising operation is sufficiently completed, that is, the time when the rising operation period ends. This is because at t = t (Y _min ) +3, the load P is stable at the value of the body weight of the subject, and it can be said that the subject is in a stationary state after finishing the standing posture.

From the above, the difference between D (t (Y _min ) +3) and D (t (Y _min )) is the center of gravity of the subject from when the subject leaves the chair 110 to when the standing up operation is completed. It represents how much fluctuated. It can be said that the smaller the difference between D (t (Y _min ) +3) and D (t (Y _min )), the smaller the variation in the center of gravity, and the better the balance ability of the subject. In the present embodiment, B is the reciprocal of the difference between D (t (Y _min ) +3) and D (t (Y _min )). Therefore, the larger B is, the better the balance ability of the subject.

  It should be noted that at least one control ability is good among control of the musculoskeletal system such as muscle strength of the lower limbs, control of the sensory system such as somatic sensation, and control of the nervous system such as peripheral nerves. expressing.

In addition, the second calculation unit 142 extracts the maximum value P _max and the minimum value P _min of the load P, and extracts time points t (hereinafter, t (P _max ), t (P _min )) corresponding to each. Then, an index S (hereinafter, “S”) representing the agility of the subject's movement is calculated by the following formula. The index S corresponds to the second index.

As described above, t (P _min ) is a moment at which the reaction to the rising motion disappears and the force that the subject tries to stand up acts on the detector 120. That is, it is a time when the load P starts to rise. t (P _max ) is the moment when the maximum force that the subject is trying to stand up acts on the detector 120, and is the time when the increase in the load P ends.

From the above, the difference between t (P _max ) and t (P _min ) can be defined as the time during which the subject continues to apply the force to stand up (hereinafter referred to as “loading time”). The shorter the load time, the shorter the time required for the load P to rise from the minimum value to the maximum value, and the subject is more agile. In the present embodiment, S is the reciprocal of the difference between t (P _max ) and t (P _min ). Therefore, as S is larger, the subject is more agile.

  It should be noted that at least one of the control capabilities of the control of the musculoskeletal system such as the lower limb muscle strength, the control of the sensory system such as somatic sensation, and the control of the nervous system such as peripheral nerves is good. expressing.

  The second calculation unit 142 outputs the calculated B and S to the third calculation unit 143. The third calculation unit 143 calculates the locomotive result L by integrating B and S. That is, L = B × S. The third calculation unit 143 outputs the calculated locomotive result L to the evaluation unit 145.

  B and S have a so-called trade-off relationship. Specifically, when the rising motion is performed quickly, S becomes a relatively large value, while it becomes difficult to control the body, balance is lost, and B becomes a relatively small value. Further, when the rising motion is performed slowly, S becomes a relatively small value, while body control is easy and balance can be maintained, and B becomes a relatively large value. When the state of the exerciser is good, B and S can be made compatible with a relatively large value. In view of this, L was defined by the integration of B and S.

  The evaluation unit 145 uses the locomotive result L to evaluate the current state of the subject's exerciser. Control unit 140 stores a regression equation indicating the relationship between locomotive performance L and age in a storage device (not shown). In this regression equation, dozens of subjects with different ages are subjected to a standing motion to obtain the Lokomo score L, and the regression line is obtained by taking the Lokomo score L on the horizontal axis and the age on the vertical axis. Is derived by As the age increases, the subject tends to lack balance ability and agility of movement, and L takes a smaller value. Therefore, the regression line is represented by a linear function having a negative slope.

  The evaluation unit 145 receives the actual age of the subject from the operation unit 160. The evaluation unit 145 reads the above regression equation from the storage device, and calculates the age of the subject with respect to the locomotive result L (hereinafter referred to as “locomo age”). The evaluation unit 145 compares the actual age and the locomotive age, and evaluates the current state of the exercise device of the subject. If the actual age is greater than or equal to the locomotive age, the subject's current musculoskeletal state is good and the risk of falling into the locomotive syndrome in the future is low. If the actual age is less than the locomotive age, the subject's current musculoskeletal state cannot be said to be good, and it is evaluated that there is a high risk of falling into the locomotive syndrome in the future. For example, when the real age is 35 years old and the locomotive age is calculated to be 28 years old, it is evaluated that the risk corresponding to the future locomotive syndrome is low. Conversely, when the locomotive age is calculated to be 40 years old, it is evaluated that there is a high risk of falling into the future locomotive syndrome.

  Evaluation unit 145 outputs locomo results L, locomo age, and an evaluation message to display unit 150. Display unit 150 displays Locomo results L, Locomo age, and evaluation message. The evaluation message is, for example, a message saying “Lokomo's risk is high. Try to exercise” when the actual age is less than the Lokomo age. "The risk is low. Please continue your exercise in this condition."

[Evaluation method]
With reference to FIG. 5, the evaluation method in one Embodiment of the exerciser evaluation system of this invention is demonstrated. The subject sits on the chair 110 with both arms assembled at the chest position and both feet placed on the detector 120. At this time, the subject places both feet such that the direction from the heel toward the toes is parallel to the Y-axis direction of the detector 120. Here, the term “parallel” includes not only the case where the direction from the heel to the toes is completely parallel to the Y-axis direction, but also includes the case where an angle of 0 to 30 degrees is formed with respect to the Y-axis. Then, the subject stands up from the chair 110 with both arms folded, stands on the detector 120, and stands still for 5 seconds to maintain the standing posture.

  As described above, the exerciser evaluation device 130 calculates the load P and the center-of-gravity coordinates X and Y during the rising motion period, and calculates the center-of-gravity locus length D for each time point during the rising motion period. Then, the exerciser evaluation device 130 calculates the locomotive result L using the calculated load P, the center of gravity coordinates Y, and the center of gravity locus length D, and evaluates the current state of the subject's exerciser.

  As described above, according to the exerciser evaluation system 100, the subject can obtain the evaluation of the exerciser only by performing a single standing motion. Therefore, the burden placed on the subject can be reduced as compared with the conventional start-up test.

  Further, as described above, the locomotive result L is calculated by integrating the index B representing the balance ability and the index S representing the action agility. Thereby, the index for evaluating the state of the exercising device can be quantified as the Lokomo performance L.

  Further, as described above, the height of the chair 110 is adjusted so that the subject and the detector 120 satisfy a certain positional relationship. Thereby, since the difficulty level of the standing motion can be made equal for each subject, an evaluation value considering the difficulty level of the standing motion of the subject can be calculated.

[Evaluation example]
The center-of-gravity locus length D and the locomotive result L when the subject is a young person and an elderly person will be described with reference to FIGS. 3, 4, 6, and 7. FIG. 6 is an example of a trajectory drawn by the barycentric coordinates from the start time to the end time when the subject is an elderly person. Compared with FIG. 3 showing the trajectory of the center of gravity of the young person. The center of gravity locus length D of the young person is 20.48 (cm), and the center of gravity locus length D of the elderly is 31.63 (cm). Thus, it can be seen that the young person has a shorter center of gravity locus length D than the elderly. That is, it can be seen that the younger person has a smaller range of fluctuation of the center of gravity in the standing up motion than the elderly person and has better balance ability.

FIG. 7 is an example of a graph showing time changes of the load P, the center-of-gravity coordinates Y, and the center-of-gravity locus length D during the rising motion period when the subject is an elderly person. 7, Y _min is −7.50 (cm), t (Y _min ) is 0.718 (s), D (t (Y _min ) +3) is 71.11 (cm), D (T (Y _min )) was 39.48 (cm). Therefore, the index B representing the balance ability was calculated to be 3.16 (1 / m). Further, P _max was 100.42 (kg), t (P _max ) was 0.843 (s), P _min was 2.15 (kg), and t (P _min ) was 0.546 (s). . Therefore, the index S representing the agility of the motion was calculated as 3.37 (1 / S). Therefore, the Lokomo performance L was 10.64.

On the other hand, the young person shown in FIG. 4 has Y _min of −9.00 (cm), t (Y _min ) of 0.795 (s), and D (t (Y _min ) +3) of 44.09 ( cm) and D (t (Y _min )) were 22.30 (cm). Therefore, B was calculated to be 4.59 (1 / m). Moreover, P _max was 72.9 (kg), t (P _max ) was 0.920 (s), P _min was 3.52 (kg), and t (P _min ) was 0.670 (s). . Therefore, S was calculated to be 4.00 (1 / S). Therefore, Lokomo performance L was 18.36. It can be seen that the younger person has a larger B and S and a higher Lokomo performance L than the elderly person.

[Verification]
With reference to FIG. 8, the usefulness of the locomotive result L will be described. As subjects, a total of 37 healthy elderly 15 people and 22 young people are targeted, and each subject is caused to perform a rising motion, and the exercise device evaluation system 100 loads P, barycentric coordinates X, Y, The time change of the center of gravity locus length D was measured. Then, the same waveform pattern was seen in the young and the elderly, and it was found that there was a waveform pattern unique to the rising motion. In addition, the average age of 15 elderly people is 61.5 years old, and the average age of 22 young people is 26.2 years old.

  The locomotive performance L of each subject was calculated by the exerciser evaluation system 100, and the average value of the locomotive performance L of 15 elderly people and 22 young people was obtained. As shown in FIG. 8, the average value of the locomotive performance L of the elderly was 12.15, and the average value of the locomotive performance L of the young was 16.13.

  The result shown in FIG. 8 is verified based on the hypothesis test. First, a null hypothesis is made that there is no significant difference between the elderly group and the young group with respect to Lokomo performance L. Then, the significance probability P is calculated by the Mann-Whitney U test. The details of Mann-Whitney U test are omitted.

  According to the hypothesis test, the significance level α is compared with the significance probability P. If P <α, the null hypothesis is rejected. On the other hand, if P> α, the null hypothesis is not rejected. The significance level α is typically 0.05.

  As shown in FIG. 8, according to Mann-Whitney U test, the significance probability P was 0.006. Therefore, P (= 0.006) <α (= 0.05), and the null hypothesis is rejected. That is, there is a significant difference between the locomotive results of the elderly and the young people, and the locomotive performance L of the elderly is significantly lower than that of the young people. It can be said that the locomotive performance L of the present invention is significantly higher than the locomotive performance L of the elderly. As mentioned above, since the fall of the musculoskeletal function accompanying an aging was able to be detected by the locomotive result L, the usefulness of the musculoskeletal evaluation system 100 was shown.

(Second embodiment)
Next, a second embodiment of the exerciser evaluation system of the present invention will be described. The second embodiment is different from the first embodiment in a method of calculating an index representing the agility of the subject's movement. Hereinafter, an index representing the agility of the subject's movement in the second embodiment is denoted as an index Sa.

[Constitution]
FIG. 9 shows an exerciser evaluation system 200 according to the second embodiment. The exerciser evaluation system 200 includes a chair 110, a detector 120, and an exerciser evaluation device 130a. The exerciser evaluation system 200 of the second embodiment is different from the exerciser evaluation system 100 of the first embodiment in that an exerciser evaluation device 130a is provided instead of the exerciser evaluation device 130, and the other configurations are the same. Hereinafter, the exerciser evaluation device 130a will be described.

  The exerciser evaluation device 130a differs from the exerciser evaluation device 130 of the first embodiment only in that a control unit 140a is provided instead of the control unit 140. The control unit 140a includes a first calculation unit 141a, a second calculation unit 142a, a third calculation unit 143a, and an evaluation unit 145a.

  The first calculation unit 141a differs from the first calculation unit 141 in the first embodiment in that a load P ′ is calculated instead of the load P, and the other points are the same. That is, the first calculation unit 141a calculates the load P ′ and the centroid coordinates X and Y during the rising motion period, and calculates the centroid locus length D for each time point during the rising motion period. The load P ′ is obtained by dividing the load P by the body weight of the subject. The unit of the load P ′ is “BW (bodyweight)”. Thus, the 1st calculation part 141a calculates load P 'which is a ratio with respect to the body weight of the load P. FIG. This is because the weight of each subject is different. In addition, the 1st calculation part 141a may calculate the load P like the 1st calculation part 141 of 1st embodiment.

  The second calculation unit 142a is different from the second calculation unit 142 in the first embodiment in that an index Sa is calculated instead of the index S as an index indicating the agility of the subject's movement, and the other configurations are the same. is there. In addition, the 2nd calculation part 142a calculates the parameter | index B as a parameter | index showing balance ability similarly to the 2nd calculation part 142 in 1st embodiment. Hereinafter, the index Sa calculated by the second calculation unit 142a will be described.

  The second calculation unit 142a acquires the load P ′ at each time point within the rising motion period from the first calculation unit 141a. The second calculation unit 142a extracts the maximum value P′max from the load P ′ acquired from the first calculation unit 141a. Subsequently, the second calculation unit 142a calculates 90% and 25% of the maximum value P′max. That is, the second calculation unit 142a calculates 0.90 × P′max and 0.25 × P′max. And the 2nd calculation part 142a is the time t (0.90 * P'max) when the load P 'becomes 0.90xP'max, and the time when the load P' becomes 0.25xP'max. t (0.25 × P′max) is acquired. And the 2nd calculation part 142a calculates the parameter | index Sa showing the agility of a test subject's operation | movement by the following formula | equation. Note that the index Sa corresponds to the second index.

  That is, the second calculation unit 142a calculates the rate of change of the load P ′ at time t (0.25 × P′max) and time t (0.90 × P′max).

  It can be said that the movement of the subject is quicker as the change rate of the load P ′ is larger. That is, the larger the index Sa, the more agile the subject's movement is. On the other hand, it can be said that the movement of the subject is slower as the change speed of the load P ′ is smaller. That is, the smaller the index Sa, the less agile the subject's movement.

  The second calculation unit 142a outputs the calculated index B and the index Sa to the third calculation unit 143a. The third calculation unit 143a calculates the locomotive result La by integrating the index B and the index Sa. That is, La = B × Sa. The third calculation unit 143a outputs the calculated locomotive score La to the evaluation unit 145a. Note that the reason why the third calculation unit 143a calculates the locomotive result La by integrating the index B and the index Sa is the same as in the first embodiment, and thus the description thereof is omitted.

  The evaluation unit 145a evaluates the current state of the exercise device of the subject using the Locomo score La. Since a specific evaluation method is the same as that of the evaluation unit 145 of the first embodiment, description thereof is omitted. As described above, the locomotive result La is calculated by integrating the index B and the index Sa. Here, the larger the index B, the higher the balance ability of the subject, and the greater the index Sa, the richer the action of the subject. Therefore, the better the condition of the subject's exercising apparatus, the larger the Locomo result La.

[Evaluation example]
With reference to FIG.10 and FIG.11, the locomotive result La in the case where a subject is a young person and an elderly person is demonstrated.

  FIG. 10 is an example of a graph showing time changes of the load P ′, the barycentric coordinate Y, and the barycentric locus length D during the rising motion period when the subject is an elderly person. For the elderly shown in FIG. 10, the index B representing the balance ability was calculated to be 2.64 (1 / m). Further, 0.90 × P′max is 1.13 (BW), t (0.90 × P′max) is 1.88 (s), 0.25 × P′max is 0.31 (BW), t (0.25 × P′max) was 1.75 (s). Therefore, the index Sa representing the agility of the motion was calculated as 6.31 (BW / s). Therefore, the Locomo result La was 16.7 (BW / m · s).

  FIG. 11 is an example of a graph representing time changes of the load P ′, the barycentric coordinate Y, and the barycentric locus length D during the rising motion period when the subject is a young person. For the young person shown in FIG. 11, the index B representing balance ability was calculated to be 4.81 (1 / m). Further, 0.90 × P′max is 1.36 (BW), t (0.90 × P′max) is 1.06 (s), 0.25 × P′max is 0.38 (BW), t (0.25 × P′max) was 0.99 (s). Therefore, the index Sa representing the agility of the motion was calculated as 14.0 (BW / s). Therefore, Locomo result La was 67.3 (BW / m · s).

  As described above, the Sa of young people is much larger than Sa of elderly people, and as a result, the Locomo results La also differed greatly between young people and elderly people.

[Verification]
With reference to FIG. 12, the usefulness of Locomo results La will be described. As subjects, a total of 52 healthy 27 elderly people and 25 young people were targeted, causing each subject to perform a standing-up motion, and the exercise device evaluation system 200 applied the load P ′, the barycentric coordinates X, Y The time change of the center of gravity locus length D was measured. The average age of 27 elderly people is 76.7 years old, and the average age of 25 young people is 22.3 years old.

  The locomotive performance La of each subject was calculated by the exerciser evaluation system 200, and the average value of the locomotive performance La of 27 elderly people and 25 young people was obtained. As shown in FIG. 12, the average value of Locomo results La of the elderly is 28.2 (BW / m · s), and the average value of Locomo results La of the young is 47.0 (BW / m · s). s).

  The result shown in FIG. 12 is verified based on the same hypothesis test as in the first embodiment. As shown in FIG. 12, the significance probability P was a value smaller than 0.001. That is, there is a significant difference between the locomotive results La of the elderly and the young people's Lacomo results La, the locomotive results La of the elderly are significantly lower than the young people's Locomo results La, conversely, It can be said that the locomotive performance La of young people is significantly higher than the locomotive performance La of elderly people. As mentioned above, since the fall of the musculoskeletal function accompanying an aging was able to be detected by Locomo result La, the usefulness of the musculoskeletal evaluation system 200 was shown.

  In particular, in the Locomo score L of the first embodiment, the significance probability P was 0.006, whereas in the Locomo score La of the second embodiment, the significance probability P is a smaller value than the first embodiment. It became. That is, according to the Locomo results La of the second embodiment, it has been shown that a decrease in musculoskeletal function accompanying aging can be detected with high accuracy. The present inventor considers the point that the accuracy of the Locomo results is improved according to the second embodiment as follows.

  That is, the inventor considers that the agility of the movement of the subject can be expressed more accurately according to the index Sa of the second embodiment. That is, according to the index Sa, it is considered that the variation of the measurement result in the same subject can be suppressed, and the accuracy of the locomotive results is improved by calculating the locomotive results using the index Sa. Actually, when the present inventor conducted a hypothesis test on the index Sa of the above-mentioned 27 elderly people and the index Sa of the 25 young people, as shown in FIG. The average value was 8.94 (BW / s), and the average value of the index Sa for young people was 12.14 (BW / s). And it turned out that the significance probability P becomes a value smaller than 0.001. That is, there is a significant difference between the index Sa of the elderly and the index Sa of the young, and the index Sa of the elderly shows a significantly lower value than the index Sa of the young, It was confirmed that the index Sa is significantly higher than the index Sa of the elderly.

[Another embodiment]
Hereinafter, another embodiment will be described.

  <1> In the present embodiment, the detector 120 and the exerciser evaluation device 130 are configured separately, but the present invention is not limited to this. That is, the detector 120 and the exerciser evaluation device 130 may be configured integrally, and the detector 120 may have the configuration of the exerciser evaluation device 130. In this case, when the subject completes the standing-up operation and stands on the detector 120, the Lokomo results L, the Lokomo age, and the like may be displayed on the display unit of the detector 120.

  <2> In the present embodiment, the control unit 140 of the exerciser evaluation device 130 includes the evaluation unit 145, but may not include the evaluation unit 145. In this case, the evaluator prepares a correspondence table between the locomotive result L and the locomotive age in advance, and when the third calculation unit 143 calculates the locomotive result L, the evaluator derives the locomotive age based on the correspondence table, The actual age of the examiner may be compared. The evaluator may verbally convey the comparison result to the subject.

  <3> In the present embodiment, the evaluation unit 145 calculates the locomotive age using the regression equation and compares the actual age of the subject with the subject, but is not limited thereto. That is, a regression equation different from the regression equation of the present embodiment, which represents a standard value of locomotive results with respect to age (hereinafter, standard value), may be derived in advance. Then, the standard value for the actual age of the subject is compared with the actually calculated Locomo score L, and if the Locomo score L is equal to or greater than the standard value, the condition of the exercising apparatus is evaluated as good and less than the standard value If so, it may be evaluated that the state of the exercise device is not good.

  <4> In this embodiment, the exerciser evaluation device 130 includes the first calculation unit 141, the second calculation unit 142, and the third calculation unit 143, but is not limited thereto. That is, the detector 120 may include at least one of the first calculation unit 141, the second calculation unit 142, and the third calculation unit 143. More generally, the exerciser evaluation system 100 may include a first calculation unit 141, a second calculation unit 142, and a third calculation unit 143.

<5> In the present embodiment, the second calculation unit 142 defines the time when the rising operation is completed as t (Y _min ) +3 in order to calculate B, but is not limited thereto. That is, the time when the rising operation is completed is not limited to 3 seconds after t (Y _min ), and may be 1 second or 5 seconds later. More generally, it may be at a point in time when the load P has converged without changing.

<6> In the present embodiment, the second calculation unit 142 calculates the index B indicating the balance ability using the barycentric locus length D, but the present invention is not limited thereto. For example, the first calculation unit 141 calculates a rectangular area (see FIG. 14) surrounding the locus of the centroid coordinates instead of the centroid locus length D, and the second calculation unit 142 calculates t (Y _min ) to t (Y _min ). The index B may be calculated using the reciprocal of the rectangular area surrounding the barycentric locus at Y _min ) +3. More generally, the index B may be calculated based on the fluctuation of the subject's center of gravity in the standing up motion, that is, the change in the center of gravity coordinates. The first calculation unit 141 may set a rectangle based on the maximum value and the minimum value of the barycentric coordinates X and Y during the rising motion period. The rectangular area can be calculated more easily than the centroid locus length D. Therefore, there is an effect that the processing load applied to the first calculation unit 141 can be reduced.

  The center-of-gravity locus length D is a value that is more faithful to the locus drawn by the center-of-gravity coordinates than the rectangular area. In the present embodiment, a more accurate index B can be calculated by using the center of gravity locus length D instead of the rectangular area.

  <7> In the second embodiment, the second calculation unit 142a uses the change rate of the load P ′ at the time point t (0.25 × P′max) and the time point t (0.90 × P′max) as the subject. Although calculated as the index Sa representing the agility of the operation, the present invention is not limited to this. For example, the second calculation unit 142a calculates 80% and 30% of the maximum value P′max of the load P ′, and the time t (0... 0) when the load P ′ becomes 0.30 × P′max. 30 × P′max) and the rate of change of the load P ′ at the time point t (0.80 × P′max) when the load P ′ becomes 0.80 × P′max may be calculated as the index Sa. In addition, the second calculation unit 142a loads the load at time t (P'max) when the load P 'becomes the maximum value P'max and at time t (P'min) when the load P' becomes the minimum value P'min. The rate of change of P ′ may be calculated as the index Sa. That is, the second calculation unit 142a performs the period from the time point t (P'min) when the load P 'becomes the minimum value P'min to the time point t (P'max) when the load P' becomes the maximum value P'max. Any two points in time may be specified, and the change rate of the load P ′ at the two points may be calculated as the index Sa. In addition, the second calculation unit 142a performs the period from the time point t (P'min) at which the load P 'becomes the minimum value P'min to the time point t (P'max) at which the load P' becomes the maximum value P'max. In the meantime, three or more time points may be arbitrarily specified, and the change rate of the load P ′ obtained by a known least square method may be used as the index Sa.

DESCRIPTION OF SYMBOLS 100: Exerciser evaluation system of 1st embodiment 110: Chair 120: Detector 130: Exerciser evaluation apparatus 130a of 1st embodiment: Exerciser evaluation apparatus of 2nd embodiment 140: Control part 140a of 1st embodiment : Control unit 141 in the second embodiment 141: first calculation unit 141a in the first embodiment 141: first calculation unit 142 in the second embodiment 142: second calculation unit 142a in the first embodiment 142a: second embodiment Second calculation unit 143: third calculation unit 143a of the first embodiment 143a: third calculation unit of the second embodiment 145: evaluation unit of the first embodiment 145a: evaluation unit 150 of the second embodiment 150: Display unit 160: operation unit 200: exercise device evaluation system of the second embodiment

Claims (7)

The load during the rising operation period from when the subject is seated with both feet placed on the detector to when the subject stands up and stands on the detector until the standing posture stabilizes, and the load A first calculation unit for calculating a barycentric coordinate which is a coordinate on the detector of the action point of
Based on the change in the center-of-gravity coordinates during the rising motion period, a first index representing the balance ability of the subject is calculated, and based on the change in the load during the rising motion period, the subject motion A second calculator for calculating a second index representing agility of
Using the first index and the second index, a third calculation unit for calculating a third index for evaluating the exercise device of the subject,
The first calculation unit further calculates a centroid locus length, which is a length of a locus drawn by the centroid coordinates from the start of the rising motion period, at each time point before the end of the rising motion period,
The second calculation unit includes:
Based on the center-of-gravity coordinates, identify the time point when the subject switches from a seated state to a standing state,
The first index is calculated using a difference between the center of gravity locus length from the start to the end of the rising motion period and the center of gravity locus length from the start of the rising motion period to the specified time point. And
Using at least two time points, exercise device evaluation system that is characterized in that to calculate the second index in to the point where the maximum from the time when the load is minimum. The second calculation unit includes:
The reciprocal of the difference between the center of gravity trajectory length from the start to the end of the rising motion period and the center of gravity trajectory length from the start of the rising motion period to the specified time is calculated as the first index. And
It said at least two time points, at least with the load at two time points, a rate of change of the load obtained with the exercise device according to claim 1, characterized in that calculated as the second indicator Evaluation system. The second calculation unit includes:
The reciprocal of the difference between the center of gravity trajectory length from the start to the end of the rising motion period and the center of gravity trajectory length from the start of the rising motion period to the specified time is calculated as the first index. And
Musculoskeletal evaluation system according to claim 1, characterized in that the reciprocal of the time required until the time when the maximum from the time when the load is minimum, is calculated as the second indicator. The exercise according to any one of claims 1 to 3 , wherein the third calculation unit calculates the third index by integrating the first index and the second index. Evaluation system. The rising operation period, according to any one of claims 1 to 4, characterized in that begins when the can and the detector and the subject said subject so as to satisfy the predetermined positional relationship is seated Exercise device evaluation system. The exercise device evaluation system includes the detector and an exercise device evaluation device,
The exercise device evaluation device is:
The first calculation unit;
The second calculation unit;
The third calculation unit;
The exerciser evaluation system according to any one of claims 1 to 5 , further comprising: A method of operating a musculoskeletal evaluation system,
After the first calculation unit provided in the exerciser evaluation system is seated with both feet placed on the detector , the subject stands up and stands on the detector, and then the standing posture is A first calculation step of calculating a load in a rising operation period until a stable time point and a barycentric coordinate which is a coordinate on the detector of an action point of the load;
The second calculator included in the exerciser evaluation system calculates a first index representing the balance ability of the subject based on the change in the barycentric coordinates in the rising motion period, and in the rising motion period A second calculation step of calculating a second index representing the agility of the subject's movement based on the change in the load;
A third calculation unit provided in the exercise device evaluation system calculates a third index for evaluating the subject's exercise device using the first index and the second index. Three calculation steps;
An evaluation unit included in the exercise device evaluation system includes an evaluation step of evaluating the exercise device of the subject based on the third index ,
In the first calculation step, the first calculation unit further calculates a centroid trajectory length that is a length of a trajectory drawn by the centroid coordinates from the start of the rising motion period before the end of the rising motion period. Calculated at each point of time,
In the second calculation step, the second calculation unit includes:
Based on the center-of-gravity coordinates, identify the time point when the subject switches from a seated state to a standing state,
The first index is calculated using a difference between the center of gravity locus length from the start to the end of the rising motion period and the center of gravity locus length from the start of the rising motion period to the specified time point. And
The method of operating an exerciser evaluation system , wherein the second index is calculated using at least two time points from a time point at which the load becomes minimum to a time point at which the load becomes maximum .

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