JP5635393B2 - Activity meter - Google Patents

Description

  The present invention relates to an activity meter that measures an activity amount of a human body based on an acceleration detection result by an acceleration sensor.

  It is known that the activity intensity, which is the amount of activity, is measured by attaching the activity meter to the waist, which is the trunk. In addition, it is known that an activity meter equipped with an acceleration sensor measures the number of steps and calculates the activity intensity based on the acceleration detected by the acceleration sensor (see, for example, Patent Document 1).

International Publication No. 2008/120710 Pamphlet

  The calculated amount of activity varies depending on the behavior of the measurement target person. For example, when the measurement subject is walking, the calculated amount of activity is larger than when the person to be measured is running. However, although the activity intensity meter described in Patent Document 1 calculates the activity intensity based on the acceleration, there is a possibility that the activity amount cannot be accurately estimated. That is, since the acceleration detection result by the acceleration sensor differs depending on the part where the activity meter is worn, for example, when the activity meter is worn on the arm, the activity amount is accurately estimated according to the behavior of the person being measured. There is a problem that you can not.

  The objective of this invention is providing the active mass meter which can estimate an active mass accurately according to the action aspect of the measuring subject of an active mass.

  [1] According to an independent form of the activity meter, the activity meter measures an activity amount of a measurement subject based on a detection result of acceleration, which is an acceleration detected by an acceleration sensor, the acceleration meter Based on the detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the behavior mode of the measurement subject is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. The activity intensity that is the activity amount, the parameter related to the activity intensity, or the calorie consumption is calculated according to the result, and the standard deviation of the acceleration is equal to or less than the running determination value, and the number of steps per predetermined time Is determined that the action mode corresponds to a walking scene, the standard deviation of the acceleration is greater than or equal to the travel determination value, Based on the fact that the number of steps per fixed time is equal to or greater than the number of travel determination steps, it is determined that the behavior mode corresponds to a travel scene, and when it is determined that the behavior mode corresponds to the walking scene, the behavior mode is the travel scene. The weight of the number of steps per predetermined time in the calculation of the amount of activity is set to be larger than that when it is determined that the amount of activity corresponds, and then the amount of activity based on the standard deviation of the acceleration and the number of steps per predetermined time Is calculated.
  [2] According to another independent form of the activity meter, the activity meter measures an activity amount of a measurement subject based on an acceleration detection result detected by an acceleration sensor, Based on the acceleration detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the measurement subject's behavior is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. A mode is determined, and an activity intensity that is the activity amount, a parameter related to the activity intensity, or a calorie consumption is calculated according to the result, and a standard deviation of the acceleration is equal to or less than a running determination value, Is determined that the behavior mode corresponds to a walking scene, and the standard deviation of the acceleration is greater than or equal to the travel determination value, Based on the fact that the number of steps per predetermined time is equal to or greater than the travel determination step count, it is determined that the behavior mode corresponds to a travel scene, and when it is determined that the behavior mode corresponds to the travel scene, the behavior mode is determined to be the walking. The weight of the standard deviation of the acceleration in the calculation of the amount of activity is set larger than when it is determined to fall under the scene, and then the amount of activity based on the standard deviation of the acceleration and the number of steps per predetermined time Is calculated.
  [3] According to one mode subordinate to the activity meter, the behavior mode corresponds to a non-walking scene based on the determination that the behavior mode does not correspond to either the walking scene or the running scene. Judge that.
  [4] According to one mode subordinate to the activity meter, when it is determined that the behavior mode corresponds to the non-walking scene, an upper limit value is set for the activity amount calculated based on the determination result. The activity amount is calculated within a range not exceeding the upper limit value.
  [5] According to another independent form of the activity meter, the activity meter measures an activity amount of a measurement subject based on an acceleration detection result that is an acceleration detected by an acceleration sensor, Based on the acceleration detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the measurement subject's behavior is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. A mode is determined, and an activity intensity that is the activity amount, a parameter related to the activity intensity, or a calorie consumption is calculated according to the result, and a standard deviation of the acceleration is equal to or less than a running determination value, Is determined that the behavior mode corresponds to a walking scene, and the standard deviation of the acceleration is greater than or equal to the travel determination value, Based on the fact that the number of steps per predetermined time is equal to or greater than the number of steps for determining the driving, it is determined that the behavior mode corresponds to a driving scene, and the behavior mode does not correspond to either the walking scene or the driving scene. Then, when it is determined that the action mode corresponds to a non-walking scene and it is determined as such, an upper limit is set for the amount of activity calculated based on the determination result, and the upper limit is not exceeded. The amount of activity is calculated.
  [6] According to an embodiment subordinate to the activity meter, when it is determined that the behavior mode corresponds to the non-walking scene, the acceleration standard deviation and the acceleration standard of the number of steps per predetermined time are determined. The amount of activity is calculated based only on the deviation.
  [7] According to an embodiment subordinate to the activity meter, when it is determined that the behavior mode corresponds to the walking scene, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time. To do.
  [8] According to an embodiment subordinate to the activity meter, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time when it is determined that the action mode corresponds to the traveling scene. To do.
  [9] According to an embodiment dependent on the activity meter, the parameter related to the activity intensity is an activity intensity per predetermined time, a sum of the activity intensity, or a product of the activity intensity and the activity execution time. is there.

  According to the activity meter, the activity amount can be accurately estimated according to the behavior of the activity amount measurement target person.

The front view of the measurement object person equipped with the active mass meter of embodiment. The block diagram of the active mass meter of embodiment. The flowchart which shows the flow of calculation of the active mass meter of embodiment. An example of the relationship between the standard deviation of acceleration and the pitch, which is the number of steps per given time Graph. Standard deviation of acceleration in walking scenes and pitch, which is the number of steps per given time The graph which shows an example of a relationship with. The activity intensity of the walking scene measured by the activity meter attached to the arm and the waist The graph which shows the relationship with the activity intensity of the walking scene measured with the active mass meter worn. The activity intensity of the running scene measured by the activity meter attached to the arm and the waist The graph which shows the relationship with the activity intensity | strength of the driving | running | working scene measured by the active mass meter worn.

  As shown in FIG. 1, the activity meter 1 for calculating the activity amount of the human body 9 of the measurement subject can be worn not only on the waist 92 of the human body 9 but also on the arm 91. A belt 1 </ b> B wound around an arm 91 is attached to a housing 1 </ b> A serving as a main body of the activity meter 1. The belt 1B is wound around the arm 91, and the activity meter 1 is attached to the arm 91.

  As shown in FIG. 2, the activity meter 1 includes an acceleration sensor 11, a sampling circuit 12, an arithmetic processing circuit 2, a display device 13, a memory 14, and a battery 15. Each part constituting the activity meter 1 such as the acceleration sensor 11 and the arithmetic processing circuit 2 is provided in one small casing 1A so that the activity meter 1 can be easily mounted.

  The acceleration sensor 11 is a small semiconductor acceleration sensor such as a piezoresistive acceleration sensor or a capacitance acceleration sensor. The acceleration sensor 11 is a triaxial acceleration sensor that detects acceleration in three axial directions orthogonal to each other. The acceleration sensor 11 outputs a signal indicating the detected acceleration, that is, a detection result of the acceleration, to the sampling circuit 12. The acceleration detection result output to the sampling circuit 12 is, for example, the norm of the same vector having the accelerations in the three axial directions as vector elements.

  The sampling circuit 12 extracts the signal output from the acceleration sensor 11 at a predetermined sampling frequency (for example, 7 Hz). In this manner, the acceleration detection result by the acceleration sensor 11 is converted into a discrete value of acceleration so that the arithmetic processing circuit 2 can perform arithmetic processing on the acceleration detected by the acceleration sensor 11. The sampling circuit 12 outputs a discrete value of acceleration detected by the acceleration sensor 11 to the arithmetic processing circuit 2.

  The arithmetic processing circuit 2 is constituted by a microcomputer composed of one or a plurality of integrated circuits. The arithmetic processing circuit 2 includes a step count calculation unit 21, a standard deviation calculation unit 22, and an activity amount calculation unit 23. Each calculation part 21-23 may be comprised by a mutually different integrated circuit, and at least 2 of the calculation parts 21-23 may be comprised by one integrated circuit.

  The display device 13 is a display unit configured by, for example, a liquid crystal panel. The display device 13 displays an activity amount measurement result based on the activity amount calculated by the activity amount calculation unit 23. The display device 13 displays, for example, an activity intensity whose unit is expressed as METs, a physical activity amount whose unit is expressed as Ex, and a calorie consumption whose unit is expressed as cal as the activity amount measurement result.

  The memory 14 is a storage device that is read and written by the arithmetic processing circuit 2. The memory 14 stores information such as a program executed by the arithmetic processing circuit 2, an activity amount arithmetic expression corresponding to the action mode of the human body 9, and an activity amount measured by the activity meter 1. The memory 14 includes an arithmetic expression A corresponding to the walking scene, an arithmetic expression B corresponding to the running scene, and an arithmetic expression C corresponding to the non-walking scene as the arithmetic expression of the amount of activity according to the action mode of the human body 9. Is remembered.

  The battery 15 is a button-type battery, for example, and is a small primary battery. The battery 15 supplies DC power to the acceleration sensor 11, the microcomputer that constitutes the arithmetic processing circuit 2, the display device 13, and the like.

The operation of each calculation unit 21 to 23 of the arithmetic processing circuit 2 will be described.
The step count calculation unit 21 calculates the number of steps per predetermined time based on the discrete value of the acceleration detected by the acceleration sensor 11. For example, when the discrete values of a plurality of accelerations indicated by the signal output from the sampling circuit 12 exceed a predetermined threshold value and are peak values, the step count calculation unit 21 counts the number of steps using a counter. Then, the step count calculation unit 21 calculates the number of steps per predetermined time by dividing the counted cumulative number of steps by the time when the discrete value of acceleration is extracted. For example, when the sampling frequency is 7 Hz and 84 discrete values of acceleration are determined, the number of steps per 12 seconds is calculated by dividing the counted cumulative number of steps by 12.

  The standard deviation calculation unit 22 calculates the standard deviation of acceleration for a predetermined time based on the discrete values of acceleration detected by the acceleration sensor 11. The standard deviation of acceleration represents the variation in acceleration detected by the acceleration sensor 11. The standard deviation calculation unit 22 calculates, for example, sample variance or unbiased variance of discrete values of a plurality of accelerations indicated by the signal output from the sampling circuit 12. Then, the standard deviation calculation unit 22 calculates the standard deviation of acceleration by calculating the positive square root of sample variance or unbiased variance.

  The activity amount calculation unit 23 calculates an activity amount based on at least one of the number of steps per predetermined time calculated by the step number calculation unit 21 and the standard deviation of acceleration calculated by the standard deviation calculation unit 22. The amount of activity calculated is, for example, the activity intensity per predetermined time, the sum of the activity intensity, the product of the activity intensity and the activity execution time, or the like. Thus, the activity amount is based on the activity intensity whose unit is represented by METs.

  In addition, the activity amount calculation unit 23 determines the action mode of the human body 9 based on the number of steps per predetermined time calculated by the step count calculation unit 21 and the standard deviation of acceleration calculated by the standard deviation calculation unit 22. At this time, the action mode of the human body 9 is determined based on the comparison result between the number of steps per predetermined time and the predetermined determination step number, and the comparison result between the standard deviation of acceleration and the predetermined determination value.

  The activity amount calculation unit 23 determines the behavior mode of the human body 9 based on the standard deviation of acceleration obtained from the acceleration detection result by the acceleration sensor 11 and the number of steps per predetermined time, and the activity amount according to the determined behavior mode. Is calculated. At this time, the activity amount calculation unit 23 responds to any one of the walking scene, the running scene, and the non-walking scene by properly using the arithmetic expressions A to C from which the activity amount is derived according to the determined behavior mode. Calculate the amount of activity.

The operation flow of the activity meter 1 that measures the activity amount of the human body 9 based on the acceleration detection result by the acceleration sensor 11 will be described with reference to FIG.
In step S <b> 1, the sampling circuit 12 extracts an acceleration signal that is a signal output from the acceleration sensor 11.

  In step S2, the step count calculation unit 21 calculates the number of steps per predetermined time based on the acceleration signal extracted in step S1. In step S3, the standard deviation calculator 22 calculates a standard deviation of acceleration based on the acceleration signal extracted in step S1. The order of steps S2 and S3 may be reversed. In order to shorten the time until the amount of activity is calculated, it is preferable that steps S2 and S3 are performed in parallel.

  In step S4, the activity amount calculation unit 23 determines whether or not the action mode of the measurement target person is a walking scene. Whether the action mode is a walking scene is determined by comparing the number of steps per predetermined time calculated in step S2 with the predetermined number of steps for determining walking, and the standard deviation of acceleration calculated in step S3 and the predetermined number. This is performed based on the comparison result with the travel determination value. For example, the activity amount calculation unit 23 determines that the action mode of the human body 9 is a walking scene when the standard deviation of acceleration is equal to or less than the travel determination value and the number of steps per predetermined time is equal to or greater than the number of walking determination steps. For example, 0.6 (G) can be used as the travel determination value. In addition, as the number of steps per predetermined time, for example, the number of steps per 12 seconds can be used, and as the number of walking determination steps, for example, 16 (steps) can be used. That is, for example, when the calculated standard deviation of acceleration is 0.6 or more and the calculated number of steps per 12 seconds is 16 or more, it is determined that the action mode of the human body 9 is a walking scene.

  FIG. 4 is a scatter diagram showing the relationship between the standard deviation of acceleration obtained from the acceleration detection result by the acceleration sensor 11 and the number of steps per predetermined time. The horizontal axis of the scatter diagram of FIG. 4 corresponds to the standard deviation of acceleration, and the vertical axis of the scatter diagram of FIG. 4 corresponds to the pitch, which is the number of steps per 12 seconds. In FIG. 4, “•” indicates data obtained when the measurement target person is walking, and “×” indicates data obtained when the measurement target person is running. ing.

  As shown in FIG. 4, the data indicating the correspondence between the standard deviation of the acceleration obtained when the measurement target person is walking and the pitch, and the standard deviation of the acceleration obtained when the measurement target person is running The data indicating the correspondence between and pitch can be grouped. That is, the data obtained when the measurement target person is walking and the data obtained when the measurement target person is walking are separated. For this reason, it can be determined that the action mode of the human body 9 is a walking scene based on a comparison result between the standard deviation of acceleration and a predetermined determination value. Even if the standard deviation of acceleration is equal to or less than the running determination value, if the number of steps per predetermined time is less than the number of walking determination steps, it is estimated that the measurement subject is swinging the arm 91 without walking. For this reason, it is possible to appropriately determine that the action mode of the human body 9 is a walking scene based on the comparison result between the number of steps per predetermined time and the predetermined number of steps.

  If it is determined in step S4 that the action mode is a walking scene, the activity amount calculation unit 23 uses the arithmetic expression A in step S5, and the acceleration standard obtained from the acceleration detection result by the acceleration sensor 11 is used. The amount of activity is calculated based on the deviation and the number of steps per predetermined time.

  FIG. 5 shows the activity intensity measured when the activity meter 1 is worn on the waist 92, and the number of steps per predetermined time obtained from the detection result of acceleration when the activity meter 1 is worn on the arm 91. It is a scatter diagram which shows the relationship. The horizontal axis of the scatter diagram of FIG. 5 corresponds to the activity intensity SW (unit: METs) measured when the activity meter 1 is attached to the waist 92, and the vertical axis of the scatter diagram of FIG. It corresponds to the pitch that is the number of steps.

  As shown in FIG. 5, the activity intensity SW measured when the activity meter 1 is worn on the waist 92 and the pitch calculated when the activity meter 1 is worn on the arm 91 are positive. There is a correlation. The correlation between the activity intensity SW and the pitch calculated when the activity meter 1 is worn on the arm 91 is the standard deviation of the acceleration calculated when the activity intensity SW and the activity meter 1 is worn on the arm 91. Stronger than the correlation.

  Therefore, in step S5, the activity amount calculation unit 23 increases the weight of the number of steps per predetermined time when calculating the activity amount. That is, for example, the activity amount calculation unit 23 calculates the calculation formula A using the number of steps per predetermined time as the main parameter in the calculation formula A and the standard deviation of the acceleration as the auxiliary parameter in the calculation formula A. The amount of activity is calculated. Thus, by calculating the amount of activity based on the standard deviation of acceleration and the number of steps per predetermined time, the amount of activity measured when the activity meter 1 is worn on the arm 91, and the activity meter 1 It is possible to reduce an error from the amount of activity measured when the is attached to the waist 92.

  FIG. 6 shows the activity intensity measured when the activity meter 1 of the present invention is worn on the arm 91 and the activity meter 1 is worn on the waist 92 when the person to be measured is walking. It is a scatter diagram which shows the relationship with the measured activity intensity. The horizontal axis of the scatter diagram of FIG. 6 corresponds to the activity intensity SA (unit: METs) measured when the activity meter 1 is worn on the arm 91, and the vertical axis of the scatter diagram of FIG. 1 corresponds to the activity intensity SA (unit: METs) measured when worn on the waist 92. The activity intensity SA is based on the activity amount calculated using the arithmetic expression A. Moreover, the straight line L1 in FIG. 6 has shown the linear approximation line of the data of FIG.

  As shown in FIG. 6, the activity intensity SW measured when the activity meter 1 is worn on the arm 91 and the activity intensity SA measured when the activity meter 1 is worn on the waist 92 are: There is a strong positive correlation. An arithmetic expression A used for calculating the activity intensity SA is an arithmetic expression corresponding to a walking scene when the activity meter 1 is worn on the arm 91. Therefore, the difference between the activity amount calculated when the arithmetic activity meter 1 is worn on the arm 91 and the activity amount calculated when the activity meter 1 is worn on the waist 92 is small.

  On the other hand, when it is not determined in step S4 that the behavior mode is a walking scene, in step S6, the activity amount calculator 23 determines whether or not the behavior mode of the measurement target person is a running scene. The determination as to whether or not the action mode is a driving scene is made by comparing the number of steps per predetermined time calculated in step S2 with the predetermined number of driving determination steps, and the standard deviation of acceleration calculated in step S3 and a predetermined value. This is performed based on the comparison result with the travel determination value. For example, the activity amount calculation unit 23 determines that the action mode of the human body 9 is a travel scene when the standard deviation of acceleration is equal to or greater than the travel determination value and the number of steps per predetermined time is equal to or greater than the travel determination step count. As described above, for example, 0.6 (G) can be used as the travel determination value. As the number of steps per predetermined time, for example, the number of steps per 12 seconds can be used. The walking determination step number is a value equal to or greater than the traveling determination step number, and for example, 28 (steps) can be used. That is, for example, when the calculated standard deviation of acceleration is 0.6 or more and the calculated number of steps per 12 seconds is 28 or more, it is determined that the action mode of the human body 9 is a running scene.

  As described above, as shown in FIG. 4, the data obtained when the measurement target person is walking and the data obtained when the measurement target person is walking are separated. For this reason, it can be determined that the action mode of the human body 9 is a traveling scene based on the comparison result between the standard deviation of acceleration and a predetermined determination value. Even if the standard deviation of the acceleration is equal to or greater than the travel determination value, if the number of steps per predetermined time is less than the travel determination step count, it is estimated that the measurement subject is shaking the arm 91 violently without walking. For this reason, it is possible to appropriately determine that the action mode of the human body 9 is the traveling scene based on the comparison result between the number of steps per predetermined time and the predetermined number of steps.

  When it is determined in step S6 that the action mode is a running scene, in step S7, the activity amount calculation unit 23 uses the arithmetic expression B to calculate the acceleration standard obtained from the acceleration detection result by the acceleration sensor 11. The amount of activity is calculated based on the deviation and the number of steps per predetermined time.

  When the person to be measured runs, a predetermined value obtained from the activity intensity measured when the activity meter 1 is worn on the waist 92 and the acceleration detection result when the activity meter 1 is worn on the arm 91. Correlation with the number of steps per hour is low. Further, when the person to be measured runs, the activity intensity measured when the activity meter 1 is worn on the waist 92 and the acceleration detection result when the activity meter 1 is worn on the arm 91 are obtained. The correlation with the standard deviation of acceleration is relatively low.

  Accordingly, in step S7, the activity amount calculation unit 23 increases the weight of the standard deviation of acceleration when calculating the activity amount. That is, for example, the activity amount calculation unit 23 calculates the calculation formula B using the standard deviation of acceleration as the main parameter in the calculation formula B and the number of steps per predetermined time as the auxiliary parameter in the calculation formula B. The amount of activity is calculated. Based on both the standard deviation of acceleration obtained from the acceleration detection result by the acceleration sensor 11 and the number of steps per predetermined time, the amount of activity in the running scene can be calculated with high accuracy.

  FIG. 7 shows the activity intensity measured when the activity meter 1 of the present invention is worn on the arm 91 and the activity meter 1 is worn on the waist 92 while the measurement subject is running. It is a scatter diagram which shows the relationship with the measured activity intensity. The horizontal axis of the scatter diagram of FIG. 7 corresponds to the activity intensity SA (unit: METs) measured when the activity meter 1 is worn on the arm 91, and the vertical axis of the scatter diagram of FIG. 1 corresponds to the activity intensity SW (unit: METs) measured when worn on the waist 92. The activity intensity SA is based on the activity amount calculated using the arithmetic expression A. Moreover, the straight line L2 in FIG. 7 has shown the linear approximation line of the data of FIG.

  As shown in FIG. 7, the activity intensity SW measured when the activity meter 1 is worn on the arm 91 and the activity intensity SA measured when the activity meter 1 is worn on the waist 92 are: There is a positive correlation. Therefore, from FIG. 7, the difference between the activity amount calculated when the activity meter 1 is worn on the arm 91 and the activity amount calculated when the activity meter 1 is worn on the waist 92 is small. I understand.

  In other words, in step S5, the degree of emphasis on the number of steps per predetermined time is greater in calculating the amount of activity than in step S7. Since the correlation between the number of steps per predetermined time obtained from the detection result of acceleration when the activity meter 1 is worn on the arm 91 and the activity intensity is very high, the degree of emphasis on the number of steps per predetermined time is large. The amount of activity in the walking scene can be calculated with higher accuracy.

On the other hand, when it is determined in step S6 that the behavior mode is not a running scene, it is determined that the behavior mode is a non-walking scene, and in step S8, the activity amount calculation unit 23 calculates the activity amount in the non-walking scene. To do. That is, when it is determined that the action mode of the human body 9 is neither a walking scene nor a running scene, it is determined that the action mode of the human body 9 is a non-walking scene . In step S <b> 8, the activity amount calculation unit 23 calculates an activity amount based on the standard deviation of the acceleration obtained from the acceleration detection result by the acceleration sensor 11 using the arithmetic expression C.

  In this embodiment in which it is determined that the action mode of the human body 9 is a non-walking scene when it is determined that it is neither a walking scene nor a running scene, in other words, whether or not it is a non-walking scene is determined. , Based on the standard deviation of acceleration and the number of steps per predetermined time. That is, when the standard deviation of acceleration is equal to or less than the travel determination value and the number of steps per predetermined time is less than the walk determination step number, and when the standard deviation is equal to or greater than the travel determination value and the number of steps is less than the travel determination step number, It is determined that the action mode of the human body 9 is a non-walking scene.

  The non-walking scene is an action scene that is different from the walking scene and the running scene. For example, the non-walking scene is a scene in which only the arm 91 is moved without moving the waist 92 that is the trunk, or both the waist 92 and the arm 91 are not moved. is there. In such a scene, the amount of activity can be calculated with high accuracy based on the standard deviation of acceleration without being based on the number of steps per predetermined time obtained from the acceleration detection result by the acceleration sensor 11. Furthermore, in step S8, the upper limit value of the calculated activity amount is set, and the activity amount calculation unit 23 calculates the activity amount within a range not exceeding the set upper limit value. That is, the amount of activity in a scene where only the arm 91 is moved without moving the waist 92 which is the trunk is smaller than the amount of activity in the walking scene and the running scene. For this reason, by setting the upper limit value of the activity amount, it is possible to suppress a decrease in the accuracy of calculating the activity amount in the non-walking scene.

  When the activity amount is calculated through any one of steps S5, S7, and S8, the display device 13 displays the calculated activity amount (step S9). Further, the memory 14 stores the calculated activity amount (step S10).

According to this embodiment, the following effects can be achieved.
(1) The activity meter determines the human behavior mode based on the standard deviation of acceleration obtained from the acceleration detection result by the acceleration sensor and the number of steps per predetermined time, and the activity meter of the human body according to the determined behavior mode Measure activity. Therefore, since the activity meter determines the behavior mode based on the standard deviation of acceleration and the number of steps per predetermined time, the behavior mode is determined based on only one of the standard deviation of acceleration and the number of steps per predetermined time. Compared to the case, it becomes possible to determine the behavior mode more appropriately. Therefore, the amount of activity can be accurately estimated according to the behavior of the person whose activity is to be measured. As a result, even when the activity meter 1 is attached to the arm 91 that is a part excluding the trunk of the human body 9, the activity amount can be measured with high accuracy.

  (2) The activity meter 1 determines that the action mode of the human body 9 is a walking scene when the standard deviation of acceleration is equal to or less than the running determination value and the number of steps per predetermined time is equal to or more than the walking determination number of steps. For this reason, the activity amount in the walking scene can be accurately estimated by measuring the optimum activity amount according to the walking scene when it is determined as the walking scene.

  (3) When the activity meter 1 determines that the action mode of the human body 9 is a walking scene, the activity meter 1 calculates the activity based on the standard deviation of acceleration obtained from the acceleration detection result and the number of steps per predetermined time. calculate. Therefore, the amount of activity can be estimated with higher accuracy than when the amount of activity is calculated based on either the standard deviation of acceleration or the number of steps per predetermined time.

  (4) The activity meter 1 determines that the action mode of the human body 9 is a driving scene when the standard deviation of acceleration is equal to or more than the driving determination value and the number of steps per predetermined time is equal to or more than the driving determination step. For this reason, when it determines with it being a driving | running | working scene, the activity amount in a driving | running | working scene can be estimated with sufficient precision by measuring the optimal amount of activities according to a driving | running | working scene.

  (5) When the activity meter 1 determines that the action mode of the human body 9 is a running scene, the activity meter 1 calculates the activity based on the standard deviation of acceleration obtained from the detection result of acceleration and the number of steps per predetermined time. calculate. Therefore, the amount of activity can be estimated with higher accuracy than when the amount of activity is calculated based on either the standard deviation of acceleration or the number of steps per predetermined time.

  (6) When the activity meter 1 determines that the action mode of the human body 9 is a walking scene, the activity meter 1 per predetermined time when calculating the activity amount is greater than when the action mode is determined to be a running scene. Increase the weight of the number of steps. When the person whose activity is to be measured walks, it has been confirmed that the correlation between the activity and the number of steps per predetermined time is high. Accordingly, in the calculation of the activity amount of the walking scene, the weight of the number of steps per predetermined time obtained from the acceleration detection result is large, so that the activity amount in the walking scene can be estimated with higher accuracy.

  (7) When the activity meter 1 determines that the action mode of the human body 9 is a running scene, the standard deviation of acceleration when calculating the activity amount is greater than when the action mode is determined to be a walking scene. Increase the weight of. It has been confirmed that when the person whose activity is to be measured runs, that is, runs, the correlation between the activity and the number of steps per predetermined time is lower than when walking. Therefore, in the calculation of the amount of activity in the driving scene, the weight of the standard deviation of acceleration obtained from the detection result of acceleration is increased, and the amount of activity in the driving scene is based on both the standard deviation of acceleration and the number of steps per predetermined time. Can be estimated more accurately.

  (8) The activity meter 1 determines that the action mode of the human body 9 is a non-walking scene when it is determined that the action mode of the human body 9 is not a walking scene and the action mode of the human body 9 is not a running scene. Judge that there is. For this reason, when it determines with it being a non-walking scene, the activity amount in a non-walking scene can be estimated with a sufficient precision by measuring the optimal activity amount according to a non-walking scene.

  (9) When the activity meter 1 determines that the action mode of the human body 9 is a non-walking scene, the activity meter 1 calculates the activity based on the standard deviation of acceleration obtained from the acceleration detection result. Accordingly, since the number of steps per predetermined time does not affect the calculation of the amount of activity in the non-walking scene, the calculation of the amount of activity in the non-walking scene can be simplified and the amount of activity can be accurately estimated. .

  (10) When the activity meter 1 determines that the scene is a non-walking scene, an upper limit value of the activity amount is set. When the activity meter 1 is attached to the arm 91, even if the person whose activity is to be measured is not walking or running, a large acceleration can be detected by shaking the arm 91. However, since the action of simply swinging the arm 91 is not an action of moving the trunk, the amount of activity is not large. Therefore, in the calculation of the amount of activity in the non-walking scene, the activity amount is calculated within the range not exceeding the upper limit value by setting the upper limit value of the activity amount. Can be estimated.

(Other embodiments)
Note that the embodiments of the present invention are not limited to the above-described embodiments, and can be modified as shown below, for example. Further, the following modified examples are not applied only to the above-described embodiments, and different modified examples can be implemented in combination with each other.

  The activity meter 1 may have a map (mapping) in which an activity amount is guided for each behavior mode, and the map may be selectively used according to the determined behavior mode. In other words, the activity amount may be calculated using a map instead of the arithmetic expression.

  If the behavior mode is determined based on the standard deviation of acceleration and the number of steps per predetermined time, the flow of the operation shown in FIG. 3 may be changed as appropriate. For example, before determining whether the scene is a walking scene or a traveling scene, the activity amount calculation unit 23 may determine whether the action mode of the measurement target person is a non-walking scene. Moreover, you may determine whether it is a running scene before determining whether it is a walking scene.

  The travel determination value compared with the standard deviation of acceleration, the walk determination step count compared with the number of steps per predetermined time, and the travel determination step count are not limited to the numerical values described in the above embodiment. That is, the travel determination value, the walking determination step count, and the travel determination step count may be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Activity meter, 9 ... Human body, 11 ... Accelerometer, 91 ... Arm, 92 ... Waist (trunk).

Claims (9)

  An activity meter that measures an activity amount of a measurement subject based on an acceleration detection result that is an acceleration detected by an acceleration sensor,
  Based on the acceleration detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the measurement subject's behavior is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. Aspect is determined, and the activity intensity, which is the amount of activity, a parameter related to the activity intensity, or calorie consumption is calculated according to the result,
  Based on the fact that the standard deviation of the acceleration is equal to or less than a travel determination value and the number of steps per predetermined time is equal to or greater than the number of steps for walking determination, it is determined that the behavior mode corresponds to a walking scene,
  Based on the fact that the standard deviation of the acceleration is equal to or greater than the travel determination value and the number of steps per predetermined time is equal to or greater than the travel determination step count, it is determined that the action mode corresponds to a travel scene,
  When it is determined that the behavior mode corresponds to the walking scene, the weight of the number of steps per predetermined time in the calculation of the activity amount is set larger than when the behavior mode is determined to correspond to the running scene. In addition, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time.
  Activity meter.   An activity meter that measures an activity amount of a measurement subject based on an acceleration detection result that is an acceleration detected by an acceleration sensor,
  Based on the acceleration detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the measurement subject's behavior is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. Aspect is determined, and the activity intensity, which is the amount of activity, a parameter related to the activity intensity, or calorie consumption is calculated according to the result,
  Based on the fact that the standard deviation of the acceleration is equal to or less than a travel determination value and the number of steps per predetermined time is equal to or greater than the number of steps for walking determination, it is determined that the behavior mode corresponds to a walking scene,
  Based on the fact that the standard deviation of the acceleration is equal to or greater than the travel determination value and the number of steps per predetermined time is equal to or greater than the travel determination step count, it is determined that the action mode corresponds to a travel scene,
  When it is determined that the action mode corresponds to the running scene, the weight of the standard deviation of the acceleration in the calculation of the activity amount is set larger than when the action mode is determined to correspond to the walking scene, Then, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time.
  Activity meter.   Based on determining that the action mode does not correspond to either the walking scene or the running scene, it is determined that the action mode corresponds to a non-walking scene.
  The activity meter according to claim 1 or 2.   When it is determined that the action mode corresponds to the non-walking scene, an upper limit value is set for the activity amount calculated based on the determination result, and the activity amount is calculated within a range not exceeding the upper limit value.
  The activity meter according to claim 3.   An activity meter that measures an activity amount of a measurement subject based on an acceleration detection result that is an acceleration detected by an acceleration sensor,
  Based on the acceleration detection result, the standard deviation of acceleration at a predetermined time and the number of steps per predetermined time are calculated, and the measurement subject's behavior is calculated based on the calculated standard deviation of the acceleration and the number of steps per predetermined time. Aspect is determined, and the activity intensity, which is the amount of activity, a parameter related to the activity intensity, or calorie consumption is calculated according to the result,
  Based on the fact that the standard deviation of the acceleration is equal to or less than a travel determination value and the number of steps per predetermined time is equal to or greater than the number of steps for walking determination, it is determined that the behavior mode corresponds to a walking scene,
  Based on the fact that the standard deviation of the acceleration is equal to or greater than the travel determination value and the number of steps per predetermined time is equal to or greater than the travel determination step count, it is determined that the action mode corresponds to a travel scene,
  Based on the fact that the behavior mode does not correspond to either the walking scene or the running scene, it is determined that the behavior mode corresponds to a non-walking scene, and when such a determination is made, calculation is performed based on the determination result. An upper limit value is set for the activity amount, and the activity amount is calculated within a range not exceeding the upper limit value.
  Activity meter.   When it is determined that the behavior mode corresponds to the non-walking scene, the activity amount is calculated based only on the standard deviation of the acceleration and the standard deviation of the acceleration among the steps per predetermined time.
  The active mass meter as described in any one of Claims 3-5.   When it is determined that the action mode corresponds to the walking scene, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time.
  The active mass meter as described in any one of Claims 1-6.   When it is determined that the behavior mode corresponds to the traveling scene, the activity amount is calculated based on the standard deviation of the acceleration and the number of steps per predetermined time.
  The active mass meter as described in any one of Claims 1-7.   The parameter related to the activity intensity is the activity intensity per predetermined time, the sum of the activity intensity, or the product of the activity intensity and the activity execution time.
  The active mass meter as described in any one of Claims 1-8.

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