JPH03195542A - Muscle force analyzing device - Google Patents

Abstract

PURPOSE:To judge the exercise function of the limb section of a person under test by providing an arithmetic means calculating the moment of each joint of the limb section based on the detected signal of a load sensor detecting the applied force of a pedal and the shift distance of the pedal and a display means displaying the calculated data. CONSTITUTION:A person under test 2 sets the limb section on a pedal 6 fixed to a movable rod 5 extended forward from the seated position and applies a force to the pedal 6 from the limb section in the region from the bent position of the limb section to the extended position of the limb section. A load sensor 8 detecting the applied force of the tested person 2 is fitted to the pedal 6, and the detected signal of the load sensor 8 is fed to an arithmetic means 10. The characteristic data of the tested person 2, i.e., OA corresponding to the thigh length and AB corresponding to the shank length, are inputted to the arithmetic means 10, and the moment of each joint of the limb section of the tested person 2 is calculated by the arithmetic means 10 based on the characteristic data from the input means 11, the detected signal of the load sensor 8, and the shift distance of the pedal 6. The calculated data of the arithmetic means 10 are displayed by a display means 12.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a muscle strength analysis device, and more particularly to a muscle strength analysis device that comprehensively analyzes the function of each joint in an exercise involving multiple joints based on muscle strength.

<Conventional technology> Functional recovery training for patients and disabled people after surgery is used to evaluate the degree of paralysis due to neurological diseases, and also to evaluate the effectiveness of training to increase physical strength in healthy people. is being measured based on muscle strength.

For example, in Japanese Patent Application Laid-open No. 62-8756, a speed-limiting load device is used that reciprocates a pedal connected to a chain stretched between sprockets by bending and stretching both legs. A lower limb extension exerciser has been proposed that applies a load and performs functional recovery training and increases physical strength based on isokinetic training.

<Problem to be solved by the invention> For example, in walking, which is a basic human movement, the flexion and extension caused by the joint movement of the knee, hip, and ankle joints is more important than the individual muscle strength of each joint. Power has an important meaning. Therefore, information on the degree of functional recovery of the lower limbs of patients and disabled patients after surgery can be obtained from the movement status of multiple joints, including the knee, hip, and ankle joints, rather than from measuring the muscle strength of a single joint. It is necessary to measure and obtain comprehensive information.

In addition, even when strengthening the muscles of the lower limbs to increase physical strength, the muscles that have been strengthened to a certain extent will not be strengthened even more with the same amount of training (so it is better to continue training only a single joint). It is desirable to perform multi-joint training to increase overall muscle strength.

If there is a single joint that particularly needs to be strengthened during this comprehensive multi-joint exercise, it is efficient to strengthen the muscles of that single joint.

The lower limb extension exerciser proposed in the above-mentioned Japanese Patent Application Laid-Open No. 62-8756 is intended for multi-joint training. On the other hand, for example, a device made in the United States called Cypex J is a muscle strength evaluation device that targets a single joint.

The present invention was made in view of the current state of this type of muscle strength measuring device as described above, and its purpose is to comprehensively measure the muscle strength of multiple joints in the limbs of a subject and to measure the strength of individual joints. It is an object of the present invention to provide a muscle strength analysis device that can analyze functions based on muscle strength and judge the motor functions of limbs of a subject both comprehensively and individually.

<Means for Analyzing the Problem> In order to achieve the above-mentioned object, the present invention provides a method for analyzing the area from the position where the limbs are bent to the position where the limbs are extended while the subject maintains a sitting posture. , a force is applied by the limb to a pedal attached to a movable rod extending forward from the sitting point, and based on this applied force, the function of the limb of the subject is comprehensively determined based on muscle strength. A muscle strength analysis device for analyzing the muscle strength includes: a load sensor attached to the pedal and detecting the applied force; an input means for inputting characteristic data of the subject; characteristic data input by the input means; a calculation means for calculating the moment of each joint of the limb of the subject based on the detection signal of the load sensor and the travel distance of the pedal, and displaying the calculation data obtained by the calculation means. It is equipped with display means.

In the present invention, the subject sets his or her limbs on a pedal fixed to a movable road that extends forward from a sitting point, and moves the area from the position where the limb is bent to the position where the limb is extended. , apply force from the limb to the pedal.

A load sensor for detecting the force applied by the subject is attached to this pedal, and a detection signal from this load center is taken into the calculation means.

Further, the characteristic data of the subject is inputted to the calculation means by the input means, and the calculation means calculates at least the limbs of the subject based on the characteristic data from the input means, the detection signal of the load sensor, and the travel distance of the pedal. The moment of each joint is calculated.

The data calculated by this calculation means is displayed by the display means.

<Example> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. As shown in the figure, a chair 1 is provided with a base 1, which is movable in the left and right directions, and on which a subject 2 sits while maintaining a sitting posture. 3 is fixed.

A cylinder 4 is fixed to the base 1 below the chair 3, a rod 5 is extended forward from the cylinder 4, and a pedal 6 is attached to the rod 5.

A rod drive device 7 is connected to the cylinder 4, and the rod drive device 7 moves the rod 5 under desired movement conditions.
It is driven to protrude forward from the cylinder 4 or to be retracted into the cylinder 4.

A load sensor 8 is fixedly attached to the pedal 6, and when the subject 2 sets his/her foot on the pedal 6 and applies force to the pedal 6, the load sensor 8 causes the rod 5 to move in the axial direction. A detection signal of an applied force in the X direction (X direction) and a detection signal of an applied force in a direction perpendicular to this (Y direction) are input to the arithmetic device 10. Further, a sensor S is fixedly installed in the cylinder 4 to detect the amount of movement of the rod 5.
The detection signal is sent to the arithmetic unit I along with the detection signal of the load sensor 8.
It is input to O.

An input device 11 is connected to the arithmetic device 10, and from this input device 11, various characteristic data necessary for analyzing the muscle strength of the subject 2, such as the subject's thighs and lower legs necessary for creating a rigid body model, are input. The lower limb size data of 1 is input to the calculation device 10.

The subject 2 takes a sitting position without being restrained on the chair 3 and sets the feet on the pedals 6, and the rod 5 is driven by the rod drive device 7 and moves along the guide 13 of the base 1. A force is applied from the foot to the pedal 6 moving together with the pedal 6 while extending or bending the knee, and the applied force applied to the pedal 6 is detected by the load sensor 8 as described above. It has become.

Further, from the rod driving device 7, a moving distance signal of the rod 5 is inputted to an arithmetic device 10, and in the arithmetic device 10, the characteristic data of the subject 2 inputted from the input device 11, the load Based on the detection signal input from the sensor 8 and the moving distance of the pedal 6 manually operated from the sensor S provided in the cylinder 4, at least the moments around the knees and hip joints of the subject 2 are calculated as muscle strength data. It looks like this.

Then, the calculation result in the calculation device 10 is displayed on the display device 12 connected to the calculation device 10, and at the same time the file M
It is now written to .

The operation of the embodiment configured as described above will be explained with reference to FIG.

Here, FIG. 2 is an explanatory diagram of the operation of the embodiment.

In FIG. 1, the rotational center position of the hip joint of the subject 2 during lower limb movement, the rotational center position of the O1 weight part as A, and the contact position of the foot with the pedal 6 as B, and these are modeled.
A triangle OAB is formed as shown in FIG.

■ corresponds to the thigh length of subject 2, Xπ corresponds to the lower leg length
is measured in advance, and this data is input from the human power device 11 to the arithmetic device 10. The data of the subject 2 necessary to model the thighs and lower legs of the subject 2 as cylindrical rigid bodies each having a mass of m 1 % m 2 , such as data on the weight and dimensions of the thighs and lower legs, is input from the input device 11 . Arithmetic device 1
It is input to 0.

It is desirable that these characteristic data be directly measured on the subject 2, but generalized reference data prepared in advance should be selected taking into consideration gender, age, height, and weight. You may also use it.

When measuring muscle strength while pushing the rod 5 out of the cylinder 4 by having the subject 2 sitting on a chair 3 set an area from the knee bent position to the knee extended position to a predetermined position, the knee The extended position is set as the end position of the rod 5, and when measuring the muscle strength while pulling the rod 5 into the cylinder 4, the extended position is set as the starting position of the rod 5. Correspondingly, in the former case, the position where the knee is bent is set as the starting point position of muscle strength measurement, and in the latter case, the position where the knee is bent is set as the end position of muscle strength measurement. .

A case will be explained in which the moment around the hip joint center 0 and the knee joint center A is calculated by having the subject 2 press the pedal 6 with his or her foot while pushing the rod 5 out of the cylinder 4 at a constant speed. do.

The feet of the subject 2 who is sitting on the chair 3 are set so as to maintain the same position on the pedal 6, the knee is bent as the starting position, and the rod drive device 7 moves the rod 5 to a predetermined position. The subject 2 is made to press the pedal 6 with his/her foot while protruding from the cylinder 4 at a high speed.

In this case, the movement is assumed to be performed within a two-dimensional plane (sagittal plane), and rotation of each joint is not taken into account. AB (lower leg)
The center of gravity of στ (thigh) is assumed to be at the midpoint of each,
Each joint shall be analyzed as a uniaxial rotational joint.

The movement distance data X from the starting point position of the pedal 6 is inputted to the calculation device 10 from time to time, and the calculation device 10 combines this movement distance data 12, the angles θ, φ, and angles of the hip joint, knee joint, and ankle joint are calculated using the following equations.

Cosθ=(n+'+x2-12")/2Xll-...
−mCosφ−(1+′+12”−X2)/2111!
2 ・ (2) CostF= (I2”+X2 AH”
)/2ff2x--(3) From (1) to (3), the arithmetic unit 10 calculates the angular velocity of the following equation.

φ−x x/ (2+ 12sinφ・・・・・・
・・・・・・・・・・・・・・・・・・・・・(5) W-(
j22'j'1' x2) x/212x2
s+nl! '-(6) Further, the calculation device 10 calculates the angular acceleration of the following equation.

/β, sin (θ 100 miles) ・・・・・・・・・・・・
・・・・・・・・・・・・・・・(7)/(! 2s
in (θ ten ri) ・・・・・・・・・・・・・・・
・・・・・・・・・・・・(8) θ=−θ−ri ・・・
・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・(9) From point B in Fig. 2, the horizontal reaction force H and the vertical reaction force V are detected by the load sensor 8 as reaction forces of the applied force. , the link X1 whose lower leg is modeled against the horizontal reaction force H and the vertical reaction force V is A
When a rotational motion is performed around a point, a translational motion is also performed at the same time.

Since the origin of this coordinate system is point A (xAyA), which has acceleration, the center of gravity of this link τ■ uses the data obtained from the X direction, and the driving equation centered at point A is written as The moment acting on link AB due to the muscle force for extending the knee is determined as M2 as shown in the following equation. Here, g is the acceleration of gravity, and mz, 12, and I2 are the lower leg mass, lower leg length, and lower leg moment of inertia input from the input device 11, respectively.

■2φ=M2 +12Vcos IF -(12Hs
in'l' (m2gj22/2) coslF - (m2
j' 2/2) (xAsinlF-yAcoslF)
-------------- (10) From the equation (10), the moment M2 is obtained by the calculation device 10 as shown in the following equation.

M2-I2φ-I 2VCO3W+ 12Hsin”F
+ (m2g62/2)cos'F+ (mz, &2/
2) (xAsin'F-yAcostF) -=-=-
(It) Similarly, the equation of motion around the rotation center 0 of the hip joint is as follows: Let the mass of the thigh, the thigh, and the moment of inertia of the thigh input from the input device 11 be ml, ff, and 1, respectively.
The acceleration in the x and x direction centered on the lower leg is x21
Taking y=, it is determined as follows.

■1θ-MI M2+p+Hs+nθ+4. Vcos
θβ +m2gCO3θ−7. m2x2gsi mouth θ12
+ m 2 V 2gcOsθ-(m, gβl/2)
COS θ (D) (From equation 121, the moment M acting on the link AO due to muscle force to extend the thigh is calculated by the calculation device 1O as shown in the following equation.

M, = -I, θ-M2+f, Hsin θ+β, Vcos
θ”, (! 1m2gCO5θ+11m 2 X 2
g5inθβ1m 2 V 2gcO5θ+ (mug!
+/2) CO5θ (13) In this way, the moment M2 due to the modeled lower leg and the moment M1 due to the modeled thigh are obtained, and the horizontal axis is the knee joint angle, It is displayed on the display device 12 as the hip joint angle or time.

When using this example as an evaluation device, this display may be used to compare muscle strength before and after surgery, or to evaluate the degree of paralysis due to neurological disease.
Furthermore, it can be used to evaluate the degree of recovery in the muscle strength recovery stage.

In addition, when using the example as a training device, target data
Since D is displayed at the same time, the subject 2 performs functional recovery training and physical strength strengthening training with this target data SD as a goal.

In addition to the moments acting on such joints, the display device 12 displays applications in the X direction and X direction corresponding to changes in the joint angles of the knees and hip joints, as well as various other calculation data.
It can be used as a reference for functional recovery training and physical strength training.

Additionally, the joint angles corresponding to the maximum and minimum moments of the knee and hip joint, the joint angles corresponding to the maximum applied force, etc. are displayed and written to file M, which can be used for later training and evaluation of the degree of recovery. You can.

While moving the load 5 to pull it into the cylinder 4, move your lower leg from a straightened state to a bending motion, and apply force to the pedal coming towards you with your foot (
(efferent extension), it is also possible to analyze the motor function at that time. Furthermore, the speed of the protruding movement of the rod 5 from the cylinder 4 or the retraction movement into the cylinder 4 is changed during the movement, and how the movement of the lower limbs responds to this change is analyzed. It is also possible to judge the degree of functional recovery and physical strength enhancement. It can also be used in conjunction with electromyography to more precisely determine the degree of functional recovery and physical strength enhancement.

As described above, according to the embodiment, the structure is simple, and the subject can sit naturally on the chair 3 without being restrained, and the legs can be easily set without being fixed to the pedals 6, and the lower limbs can be adjusted. Since the state of motion is comprehensively analyzed for multiple joints, the degree of functional recovery and physical strength enhancement can be determined with high precision and detail.

In addition, various analysis results are displayed on the display device 12 in comparison with the target data S, so that functional recovery training and physical strength strengthening training accompanied by biofeedback can be performed in a multi-joint manner to achieve effects. I can do it.

Furthermore, since various functions are analyzed in a single exercise, multi-joint motor functions of the lower limbs can be efficiently determined without placing any burden on the examinee, and the data can also be organized and saved. I can do it.

In addition, although the case where the muscular strength of a lower limb was analyzed was demonstrated in the Example, this invention is not limited to an Example, The analysis of the muscular strength of a subject's upper limb can also be performed. In addition, in the example, a case was explained in which one of the legs was measured using two rods, but the present invention is not limited to the example, and both feet were measured using a Japanese rod. It is also possible to adopt a configuration in which independent measurements are performed for each target.

<Effects of the Invention> As explained in detail above, according to the present invention, the subject can be easily used in a free posture without being restrained.
It is possible to provide a muscle strength analysis device that comprehensively analyzes the function of a subject's limbs over multiple joints based on muscle strength, and quickly and accurately determines the function of the limbs.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of one embodiment of the present invention, and FIG.
The figure is an explanatory diagram illustrating the operation of an embodiment of the present invention. ■... Base, 2... Subject, 3...
...Chair, 4...Cylinder, 5...
Rod, 6...Pedal, 7...Rod drive device, 8...Load sensor, IO...
- Arithmetic device, 11... Input device, 12...
...Display device, 13...Guide. Figure 2

Claims (2)

[Claims] (1) While the subject is in a sitting position, the pedal is attached to a movable rod that extends forward from the sitting position in the area from the position with the limbs bent to the position where the limbs are extended. , a muscle strength analysis device that applies force with the limb and comprehensively analyzes the function of the limb of the subject based on the muscle strength based on the applied force; a load sensor for detecting a load sensor; an input means for inputting characteristic data of the subject; A muscle strength analysis device comprising a calculation means for calculating moments of each joint of an examiner's limbs, and a display means for displaying calculation data obtained by the calculation means. (2) The muscle force analysis device according to claim (1), wherein the rod is configured to move under preset desired conditions.