JPH05293200A - Measuring method for instantaneous motive force by leg extending force - Google Patents

Abstract

PURPOSE:To obtain the measuring method for measuring instantaneous motive force of dynamic single multi-joint physical exercise such as a vertical jump as action, with regard to the method for measuring dynamically instantaneous motive force of single muscular power by leg extending force of an examinee, based on a power theory especially, in the method for measuring physical strength of a human being. CONSTITUTION:To work volume executed to a powder brake, work volume of an equivalent inertial energy portion absorbed by a rotation driving system consisting of the powder brake, an intermediate shaft and a rope drum shaft, and work vlume of a physical exercise energy portion obtained by an actual foot plate are added, the maximum speed Vmax of the foot plate and its appearance time Tmax are derived, and from the foot plate maximum speed Vmax and its appearance time Tmax, power generated by leg extension is derived.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring the physical strength of a human. In particular, based on the power theory, it relates to a method for dynamically measuring the instantaneous force of a single leg muscle force by the leg extension force of a subject, and it is operatively determined that a dynamic single joint articulation such as vertical jump is performed. The present invention relates to a measuring method for measuring instantaneous force.

[0002]

2. Description of the Related Art The following questions have been raised regarding conventional physical fitness diagnostic tests such as vertical jump, repeated jump, and back muscle test. (1) Since each function is divided and evaluated, it is difficult to link to the comprehensive evaluation. (2) The evaluation criteria are ambiguous. For example, in the vertical jump, the jumped height is the evaluation criterion, but this is
It is a monthly index and an indirect and alternative index of physical fitness. (3) There is no unified scientific support. (4) It is accompanied by extraordinary operations, has a large load, and is easily injured.

On the other hand, in recent years, interest in physical strength has increased, and simple,
There is a demand for a method and a device for measuring the physical strength safely and accurately, and studies are being made to create an index of physical strength based on the power theory. In the power theory, physical strength is measured using energy capacity (power integrated value) or power as an index. The expression form of power is classified according to the energy expression mechanism in the living body, and the upper limit value of power is measured while maintaining the corresponding energy expression mechanism for each expression form of power, and the physical strength of each energy expression mechanism is measured. It is used as an indicator.

Specifically, the measurement is performed as follows. (A) Aerobic energy mechanism Duration: Infinity Upper limit power rating: Power at heart rate reaching 75% of maximum heart rate, etc. Main factor of energy generation: Oxygen (b) Lactic acid-based anoxic energy mechanism Persistence Time: About 30 seconds Upper limit power evaluation: Average power, critical power, etc. Main factors of energy generation: Glycogen (c) Non-lactic acid-based anoxic energy mechanism Duration: About 7 seconds Upper limit power evaluation: 5-6 Optimum value determined by speed and expression power of peak power before and after seconds Main factor of energy generation: ATP-CP chemical energy Regarding the energy mechanisms of (a) and (c) above,
The applicant has put into practical use a measuring device using a bicycle ergometer (see Japanese Patent Publication No. 1-42694), and as a device to which this technique is applied, AEROBIKE and P
OWERMAX (both are registered trademarks and pending trademarks of Combi Co., Ltd., the former being registered No. 1840771 and the latter being commercial Sho 61-42348) is known.
The Wingate test is known for the energy mechanism of (b).

As described above, the instantaneous power measuring device for a subject, which is mainly a bicycle ergometer, has less injury because the pedal operation is a rhythmical exercise close to a daily running exercise, and the power is efficiently exhibited. It has features. On the other hand, even in continuous leg strength exercises such as a bicycle or other similar multi-joint exercises, in the movements such as suddenly moving an obstacle in daily life, dynamic and single leg strength The instantaneous power of is also an important factor. As a measuring device for the instantaneous force of a single leg muscle force, there is a conventional device such as, for example, Japanese Utility Model Laid-Open No. 63-18103.
There is one that receives a leg extension force by a hydraulic cylinder or an air cylinder and measures the physical strength of the subject based on the change data of the cylinder.

However, in the above-mentioned leg extension force measuring device, it is very difficult to adjust the cylinder and the like, and moreover, it is difficult to accurately measure the instantaneous force because the load changes depending on the speed. Also, in the hydraulic cylinder, the response time of the hydraulic pressure is slow, so it is accurate. It has a drawback that various measurement results cannot be obtained.

[0007]

The present invention has been made in consideration of the above circumstances, and based on the power theory,
The aim is to minimize the unstable parts of the measurement system and to measure the instantaneous force accurately. Therefore, in order to reduce the influence of inertia on power measurement as much as possible, a powder brake was used, and the kicking time of the foot plate was made as short as possible compared to the conventional power measurement method of the non-lactic acid-based anoxic energy mechanism. It is an object of the present invention to provide a method for measuring the instantaneous force by the leg extension force, which can reduce the burden on the measurement of the force and measure the instantaneous force of a single leg muscle force.

As a load application mode, a constant torque load system is used instead of a system such as a hydraulic system or a dynamo system in which the magnitude of the load is changed according to the pedaling speed. That is, considering that the load response time by the powder brake is about 200 ms, it is impossible to change the load on the way in the measurement for about 0.3 seconds. Therefore, a constant torque is adopted to improve accuracy. Thus, it is an object of the present invention to provide a method for measuring the instantaneous force by the leg extension force, which eliminates the change in the load during measurement and stabilizes the measurement.

Furthermore, since the angle of refraction of the sole changes during leg extension, the pedal force becomes unstable if the angle of the foot plate is fixed as in the conventional art. Therefore, in the present invention, the angle of the foot plate is extended. It is an object of the present invention to provide a method for measuring instantaneous force by leg extension force that automatically responds to. Furthermore, in order to achieve the above-mentioned object, the relationship between the foot plate reaction force obtained by the vertical jump shown in FIGS.
Paying attention to the fact that it is possible to shift to the leg extension shown in (a) and (b), and from the relationship of the equation of motion, the powder brake load is the vertical jump, and the inertia weight Wo / g is the vertical jump. It corresponds to the mass equivalent to the mass of the upper limb that is applied to the middle and lower limbs as inertial force. In particular, the leg extender moves the lower limb like a vertical jump, so it is sufficient to consider the inertial mass of the upper limb that moves horizontally. For example (about 70% of the body weight is said to be the upper limb mass of a human body.) For example, a person of 65 kg has a weight equivalent to 46 kg of 40 kg to 50 kg, and the foot plate has an equivalent mass of 1 Wo / g. The leg extension power near vertical jump is measured by giving an equivalent mass.

That is, by selecting the load set value and the foot plate equivalent mass as the upper limb mass of the human body, it is possible to measure the leg extension power close to a vertical jump. Furthermore, the measurement using the force sensor attached to the foot plate complicates the structure and is not easy to operate. Furthermore, in the conventional power calculation, it is usual to calculate the instantaneous power due to the leg extension force from the amount of work performed on the brake load, but in such calculation, the time when kicking with full force is very short (0 , About 3 seconds), the structure of the foot plate is made heavy because it receives the kicking force with full force, and the kinetic energy and inertia energy absorbed by the foot plate and the brake rotation system were not taken into consideration. It was very difficult to measure the instantaneous power due to leg extension.

Furthermore, since no braking means is provided for preventing the impact on the foot when the kick is finished due to the weight of the structure, an error may occur in the measurement of the instantaneous power due to the leg extension force. Yes, and because the foot plate stretches its legs due to inertia, it is not safe.
The purpose is to solve these problems.

[0012]

In order to achieve the above object, the present invention is equivalent to the work performed on the powder brake being absorbed by the rotary drive system including the powder brake, the intermediate shaft and the rope drum shaft. The foot plate maximum velocity Vmax and its appearance time Tmax are obtained by adding the work amount of inertia energy and the work amount of the kinetic energy obtained by the actual foot plate, and the foot plate maximum velocity Vmax and its appearance time Tmax are obtained. Find the power generated by leg extension.

[0013]

Since the present invention employs the above-described measuring method, the instantaneous force can be measured with a full-power kick for an extremely short time with respect to the foot plate. The burden is small, and the leg extension force of the subject can be measured very easily, and the measurement accuracy of the instantaneous force is also very high.

By the above-mentioned full-strength kick movement, it is possible to measure the instantaneous force due to the leg extension force of the dynamic single-shot multi-joint movement such as vertical jump.

[0015]

Embodiments Hereinafter, FIGS. 3, 4, 5, 6, 7, and 8.
And the method for measuring the instantaneous force by the leg extension force according to the present invention will be described in detail with reference to FIG. 3 is a perspective view of the entire apparatus, FIG. 4 is an explanatory view seen from the side of the entire apparatus, FIG. 5 is a plan view of a main part of a drive unit of the apparatus, FIG. 6 is a block diagram showing the entire apparatus, and FIG. FIG. 8 is a flow chart for explaining the order, FIG. 8 is a graph for calculating the average leg extension power, and FIG. 9 is a graph showing the measurement of Lp by the drum axis encoder pulse.

In the figure, reference numeral 1 denotes a device for measuring instantaneous force by leg extension force used in a method for measuring instantaneous force by leg extension force according to the present invention. The instantaneous force measuring device 1 based on the leg extension force has two long members (in the present embodiment, a metal square bar is used) 2
a is arranged in parallel, a box body 3 provided at a rear portion of the base frame 2, a drive unit 4 incorporated in the box body 3, and above the drive unit 4, A seat 5 on the upper surface of the box 3 for the subject M to sit on, and a seat 5 extending in the same direction as the base frame 2 with the upper front side of the box 3 as a base end, and of the base frame 2 A guide unit 6 provided between the vertical plates 2b erected at the tip, a foot unit 7 that slides back and forth along the guide unit 6, a measurement unit 8 that measures the sliding state of the foot unit 7, and the measurement unit. A display unit 9 that visually or audibly displays various data obtained by the leg extension of the subject M measured by the unit 8;
The main part is constituted by the input unit 10 for inputting required predetermined data.

The two elongated members 2a constituting the base frame 2 are arranged in parallel with each other at a constant left and right intervals,
Two casters 2c, which can be adjusted up and down, are arranged on the left and right of the rear end portions of both elongated members 2a, and the lower position of the front face portion of the box body 3 and the vertical plate 2b erected at the tip of the base frame 2 are provided. At the right and left positions immediately below, four fixed adjusters 2d for holding the base frame 2 horizontally and stably fixing the base frame 2 are arranged in front, rear, left and right for convenience.

The box body 3 is constructed by arranging plates 3b around four columns 3a which are vertically provided vertically above the rear side of the base frame 2. Further, the drive unit 4 includes a rope drum 4c wound around a rope 11 which will be described later and which is inserted through a rotary shaft 4b arranged between brackets 4a which are erected on the left and right of the inside of the box body 3 toward the front, and the rope drum 4c. A return spring 4d (a return spring 4d has a tubular spring structure as shown in the drawing), a first sprocket 4e arranged on one side of the rope drum 4c, and a first sprocket 4e. An intermediate shaft mechanism 4g that is rotated in one direction via a chain 4f that is wound around (the intermediate shaft mechanism 4g is
Of the free wheel sprocket 4g4 wound around the chain 4f, which has a rotary shaft 4g2 inserted through left and right brackets 4g1 standing upright in the center of the inside of the freewheel and a freewheel 4g3 mounted on the rotary shaft 4g2. It is composed of a third sprocket 4g5 fixed to the shaft 4g2. ), A powder brake mechanism 4i rotated in one direction through a chain 4h wound around the third sprocket 4g5, and the powder brake mechanism 4i includes a bracket 4i1 provided upright at a rear position inside the box body 3. ,
A rotary shaft 4i2 inserted through the bracket 4i1, a fourth sprocket 4i3 fixed to the rotary shaft 4i2 and rotated in one direction by the chain 4h, and the rotary shaft 4i2.
It is composed of a powder brake 4i4 that rotates by.

The seat 5 above the drive unit 4 and on the upper surface of the box 3 for seating the subject M is a parallel slide guide arranged on the left and right of the lower surface of the seat 5. By inserting the shaft 5a into the left and right shaft receiving portions 5b projectingly provided on the upper surface of the box body 3, the shaft 5a is slid back and forth by a predetermined width so that the seating position of the subject M can be adjusted to an optimum position. There is.

Further, the guide portion 6 formed by extending in the same direction as the base frame 2 with the upper front side of the box body 3 as the base end is arranged horizontally between the plates 2b erected at the tip of the base frame 2. Between the left and right upper guide shafts 6a that are laid across and installed, and between the plates 2b that extend in the same direction as the base frame 2 with the upper front side of the box body 3 as the base end, and are erected at the tip of the base frame 2. It is composed of a central lower guide shaft 6b which is installed so as to be inclined so as to be lowered in the front and is installed so as to extend.

The foot portion 7 which slides back and forth along the guide portion 6 has a slider 7b (the slider 7b) which slides forward and backward by inserting the through holes 7a provided on the left and right of the upper guide shaft 6a. At the center of the rear part, the rope 11 wound around the rope drum 4c described above.
One end is bound), and the back surface is swingably hinged by a bracket portion standing in front of the slider 7b,
It is composed of a foot plate 7e having a foot receiving portion 7d on the surface of which the subject M aligns and places both feet.
e is a fork 7f1 provided at the lower end of the supporting portion 7f, with a supporting portion 7f projecting downward of the foot receiving portion 7d facing downward through a hole 7g formed in the central portion of the slider 7b.
By inserting the lower guide shaft 6b into the insertion hole 7h1 of the seal boss 7h that is swingably attached by being supported by the left and right screws attached to the
The foot receiving portion 7d of the foot plate 7e that moves back and forth is configured to have an optimum angle according to the leg extension of the subject M.

The measuring unit 8 for measuring the sliding condition of the foot 7 includes a drum shaft encoder 8a fixed to the first sprocket 4e of the rope drum 4c and a photo sensor 8b for detecting the number of rotations of the drum shaft encoder 8a. Forward / reverse rotation pulse detection counter 8c of the rope drum 4c provided with the rotary shaft 4 of the powder brake mechanism 4i.
The load shaft encoder 8d fixed to i2, the load shaft rotation pulse detection counter 8f for detecting the rotation of the powder brake 4i4 including the photosensor 8e for detecting the rotation of the load shaft encoder 8d, and the powder brake 4
The load current adjuster 8g for adjusting the current of i4, the pulse signals from both the pulse detection counters 8c and 8f, the mode signal selected by the mode changeover switch 8h, and the data signal input from the input unit 10 described later. Based on the calculation processing device 8i (hereinafter, referred to as “processing device 8i”) that calculates the leg extension force when the subject M repeatedly kicks the foot plate 7e a proper number of times.
The measuring unit 8 includes a drum shaft encoder 8a and a photo sensor 8b for detecting the number of rotations of the drum shaft encoder 8a.
And the load shaft encoder 8d, and the load shaft encoder 8
The components other than the photo sensor 8e that detects the rotation of d are provided inside a cabinet 14 that includes a card reader / writer 12 for an IC card at an appropriate location and a printer 13 for recording the measurement result. It has been incorporated. The card reader / writer 12 and the printer 13 for the IC card are adopted in order to facilitate the management of the weight input data and power output data of the subject M by the host computer.

Further, in this embodiment, the cabinet 14 is mounted on the frame 15 detachably erected on the side portion of the base frame 2a described above, and is easily operated by the subject M seated on the seat 5. It is located in a position. Further, for displaying visually or audibly predetermined data measured by the measuring unit 8, for example, a step counter, a weight value (kg) of the subject M, a power value (W), a required time (S). ) And the like are configured by an LED display 9a arranged above the surface of a cabinet 14 in which the above-described measurement unit 8 is incorporated, a buzzer 9b incorporated in the cabinet 14, or the like.

The input unit 10 for inputting various data such as the body weight of the subject M itself to the microcomputer 8i is a key 10b arranged below the surface of the cabinet 14 in which the above-mentioned measuring unit 8 is incorporated. Etc. The output of the microcomputer 8i described above is input to the powder brake 4i4 via the load current adjuster 8g, and the forward slide of the foot plate 7e kicked out by the subject M is braked (the leg of the subject M). The so-called automatic brake mechanism capable of detecting Vmax of the foot plate 7e in real time is adopted as a simple brake utilizing the length measurement of the foot plate 7e. The brake position is set to the longest distance of the leg extension length in the natural state of the subject M, which is measured by the subject M prior to the measurement, to prevent an inertial impact generated at the end of kicking of the foot plate 7e, and to be stable. It is configured so that the measurement can be performed.

Further, each data of the micro computer 8i is connected to a host computer (not shown in the figure) via an interface circuit 16 so that the measurement result is managed by an external device. .. By the way, the calculation of the leg extension force of the subject M by the microcomputer 8i transmits the leg extension force generated by the subject M kicking out the foot plate 7e to the rope drum 4c via the rope 11, The photosensor 8b detects the number of rotations of the drum shaft encoder 8a which rotates with the rotation of the rope drum 4c, and inputs the number of rotations signal of the rope drum 4c to the microcomputer 8i via the forward / reverse rotation pulse detection counter 8c. Along with the rotation of the rope drum 4c, the first sprocket 4e and the intermediate shaft mechanism 4 are rotated.
finally transmitted to the powder brake 4i4 via g,
The rotation of the load shaft encoder 8d fixed to the rotary shaft 4i2 of the powder brake 4i4 is detected by the photosensor 8e, and the detection signal is detected by the load shaft rotation pulse detection counter 8f.
The leg extension force of the subject M is accurately calculated by inputting it to the microcomputer 8i via.

In the above calculation, according to the present invention, the equivalent mass of the rotary shaft 4b of the rope drum 4c, the rotary shaft 4g2 constituting the intermediate shaft mechanism 4g, the rotary system of the powder brake 4i4 and the like is calculated and calculated for accurate measurement. ..

[0027]

[Equation 1]

Then, the actual mass of the foot plate 7e is further added to the equivalent mass of the rotary system obtained above, and the equation of motion of the leg extension of the subject M is calculated as follows.

[0029]

[Equation 2]

When the equation of motion of the leg extension is obtained, the leg extension force is estimated from the rotation of the drum shaft encoder 8a and the load shaft encoder 8d described above, and the leg extension force from the appearance time Tmax, that is, to be measured. The power generated by the person M's leg extension is obtained, and the rotation system including the powder brake 4i4, the rotary shaft 4g2 of the intermediate shaft mechanism 4g, and the rotary shaft 4b of the rope drum 4c is added to the work done for the powder brake 4i4. The work amount of the inertia energy to be absorbed and the work amount of the kinetic energy obtained by the foot plate 7e are added, and this is defined as a new leg extension power unique to the present invention. Calculate the average leg extension power.

[0031]

[Equation 3]

[0032]

[Equation 4]

[0033]

[Equation 5]

"Measurement of the speed V of the foot plate 7e by the rotation pulse of the load shaft encoder 8d"

[0035]

[Equation 6]

"Measurement of the amount Lp of movement of the rope 11 due to the rotation of the drum shaft encoder 8a" The drum shaft encoder 8a
Let Δx be the moving distance of the rope 11 per rotation pulse. In addition, forward / reverse rotation pulse detection counter 8c is used for normal rotation,
When the reverse rotation pulse is detected (two-phase counter), the counter by the drum shaft encoder 8a is C _2, and the moving distance from the origin of the foot plate 7e is Lp,
The offset value of C ₂ is C _OFF (considering a miscount when the foot plate 7e returns to the origin).
The subject M uses the foot plate 7e to measure Lp.
Gently extend twice to count the C ₂ counter.
The condition of the up-count C _u to prevent miscount by shaking at this time leg in extension and down count C _D is to have appropriate hysteresis is distinguished by the condition of the down count C _D.

[0037]

[Equation 7]

In the above calculation, considering that the foot plate reaction force generated by the vertical jump is based on the analogy of the equation of motion of the vertical jump, that the center of gravity of the weight is under the influence of gravity, Also in the method for measuring the instantaneous force by the leg extension force according to the present invention, the weight load of the subject M was selected in determining the brake set value of the powder brake 4i4. Hereinafter, the method for measuring the instantaneous force by the leg extension force according to the present invention will be described based on the device for measuring the instantaneous force by the leg extension force.

[0039]

[Operation of Device] The operation of the instantaneous force measuring device 1 based on the leg extension force is performed by the subject M sitting on the seat 5 through the foot plate 7e.
It is done by kicking the ball forward. The foot plate 7e kicked forward by the subject M is
A supporting portion 7f that hinges swingably with respect to the slider 7b and that projects downward through a hole 7g of the slider 7b.
Since the lower end of the leg is guided by the lower guide shaft 6b that gradually inclines as it goes forward, the angle of the foot of the subject M who extends forward from the bent state of the leg is the change in the angle of the foot plate 7e. That is, as indicated by the solid line and the phantom line in FIG. 4, the angle is changed to follow the forward tilted posture and the substantially vertical state as it goes forward. Therefore, the extension motion of the leg of the subject M at the time of measurement can be reasonably and naturally proceeded to extend the leg, kick the foot plate 7e, and start the measurement.

By the way, the foot plate 7e kicked out by the subject M pulls out the rope 11 connected to the center of the rear part of the foot plate 7e as it moves forward. Therefore, the rope drum 4c around which the rope 11 is wound is
It rotates against the return spring 4d. Then, this rotation is input to the microcomputer 8i via the drum shaft encoder 8a, the photosensor 8b, and the forward / reverse pulse detection counter 8c mounted on one side of the rotary shaft 4b.

The rotation of the rope drum 4c is the first
Sprocket 4e → Chain 4f → Freewheel 4g 3
→ Free wheel sprocket 4g4 → third sprocket 4g5 → chain 4h → transmitted to the powder brake 4i4 via the fourth sprocket 4i3. The rotation of the powder brake 4i4 is input to the microcomputer 8i via a load shaft encoder 8d, a photo sensor 8e and a pulse detection counter 8f mounted on one side of the rotary shaft 4i2.

The forward movement of the foot plate 7e kicked out by the subject M is such that when the leg of the subject M reaches the position where the length is measured, the foot is pulled by the weight of the foot plate 7e. The powder brake 4i4 is braked and stopped so that it cannot be heard. As a result, the subject M bends his legs and pulls the foot plate 7e back to its original position. When the foot plate 7e is returned, an elastic force in the forward direction of the return spring 4d attached to the rope drum 4c acts very smoothly, and the rope 11 is wound around the rope drum 4c without slack. .

[0043]

[Measurement Procedure] (1) First, the subject M sits on the seat 5, slides the seat 5 back and forth in the same posture, and sets the foot plate 7e in an optimal state for kicking out for measurement. At the time of adjusting the seat 5, the foot plate 7e is in a braked state, and the subject M uses the reaction force of the foot plate 7e to adjust the front and rear of the seat 5. (2) Next, the subject M receives the foot receiving portion 7 of the foot plate 7e.
Place both feet on d and fasten the foot belt equipped on the foot receiving portion 7d to fix the foot to the foot plate 7e, and wear the seat belt equipped on the seat 5 on the waist to hold the lower half of the body stably and start the measurement. Prepare your front posture. (3) Next, the examinee M operates the mode changeover switch 8h provided in the vicinity of the display section 9 to measure the measurement mode, for example, the A mode (examinee M is shown in the flowchart). Mode in which the user enters his / her own weight with the key to enter the measurement), B mode (in which the IC card is inserted into the card reader / writer 12 for the IC card, and the measurement is started according to the data recorded in the IC card), Any one of the C mode (the mode in which the subject M enters the measurement by inputting the load data suitable for his physical strength with the key) is selected.

The mode selection described above is displayed by the LED display 9a provided on the display unit 9. For example, when the subject M selects the A mode, the display indicating the weight input on the display unit 9 is turned on. After confirming this lighting, the subject M inputs a predetermined numerical value, which is his / her weight, by operating the key. This input numerical value is the above-mentioned LED display 9a.
Is displayed more accurately and the subject M is informed. (4) Next, the subject M presses the length measurement key. When the length measurement key is pressed, the length measurement LED display 9a starts flashing and notifies the subject M that the length measurement key has been operated. In accordance with this, the subject M operates the start key to kick out the foot plate 7e twice, and measures the length when the leg is extended. By this length measurement, the microcomputer 8i stores the timing of braking the powder brake 4i4. Then, when the above-mentioned length measurement is completed, the length-measuring LED display 9a is changed from the flash to the stationary lighting, and the subject M is informed that the length measurement is completed.

The above-described length measuring operation step is omitted when the measurement is performed in the automatic brake mode. (The automatic braking is a method of detecting the peak value of Vmax in real time and applying the braking. Since the braking force is applied after the peak is detected, a delay time is generated as compared with the braking by the length measurement. Therefore, it is used as a simple method.) 5) When the above-described length measurement is completed, the measurement LED display 9a, which means that measurement is possible, flashes to notify the subject M that measurement is ready. The subject M who confirms this presses the start key to start the instantaneous force measurement by the leg extension force. When the start key is pressed, the measurement LED display 9a, which was flashing in a measurable state, is replaced by the stationary lighting and the measurement is started.
Let me know.

In the above state, when an external display is used, at the same time, a predetermined signal is sent from the microcomputer 8a to the external display, and the same display as above is displayed. When an external computer or the like is connected, a predetermined measurement sequence code is similarly sent from the microcomputer 8i and recorded by the external computer. (6) At the same time when the measurement LED display 9a is turned on, the microcomputer 8i enters the 10-second timer down count before measurement. When the 10-second counting is completed, the subject M starts the instantaneous force measurement for 3 seconds in the first step. The kicking-out timing of the foot plate 7e in this case is made according to, for example, the sound of the buzzer 9b, and the subject M measures by kicking out the foot plate 7e with the buzzer sound.

The end of the first step is the end LED display 9
At the same time, the power measured in the first step is displayed on the display 9. In addition, after kicking out, the subject M has a rest for 20 seconds and pulls back the foot plate 7e kicked out to the original position during this period. At this point, the powder brake 4i4 is actuated to return to the stationary state. (This brake allows the subject M to rest with his / her foot resting on the foot plate 7e.) (7) When the 20-second rest after the above-mentioned first step is completed, as in the case of the first step, When the measurement LED indicator 9a, which means that measurement is possible, flashes on the display 9 and the second step (the same applies to the third step, the fourth step, and the fifth step) is entered, the measurement LED display 9a flashes. Notify the examiner M. The subject M who confirms this presses the start key again to start the instantaneous force measurement by the leg extension force.

The results measured in the first to fifth steps are the microcomputer 8i for each step.
In other words, the work done for the powder brake 4i4 is calculated by the work amount equivalent to the inertia energy absorbed by the rotary drive system including the powder brake 4i4, the intermediate shaft mechanism 4g, and the rotary shaft 4b of the rope drum 4c. The maximum velocity Vmax of the foot plate 7e and its appearance time Tmax are obtained by adding the work amount of the kinetic energy obtained by the foot plate 7e of FIG. The average power generated by the leg extension of the examiner M is measured. (8) Then, when the measurement of the first to fifth steps described above is completed, the end LED display 9a is turned on to notify the subject M of the end of the measurement. The end of the measurement at the same time is confirmed by the buzzer sound, and the result of the measured power is displayed on the display 9.

The result of the measured power is the printer 1
3 is printed and recorded on the IC card set in the card reader / writer for the IC card, and all measurements are completed.

[0050]

As described in detail above, according to the present invention, the powder brake is adopted as the constant torque low inertia load mechanism, and the instantaneous force is measured by the full power kick for the foot plate for a very short time. Due to the very natural movement system by kicking, the physical load on the subject is small, and the leg extension force of the subject is easy to measure, and the accuracy of the instantaneous force is very high. The above-described full-strength kick exercise has various excellent effects such as the ability to measure the instantaneous force of dynamic single-joint articulated movement such as vertical jump.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a reaction force of a foot plate obtained by vertical jump and a center of gravity of a human.

FIG. 2 is a diagram showing a relationship between a foot plate reaction force and speed obtained by extending a leg.

FIG. 3 is a perspective view of the entire apparatus.

FIG. 4 is an explanatory view seen from the side of the entire apparatus.

FIG. 5 is a plan view of an essential part of a drive unit of the apparatus.

FIG. 6 is a block diagram showing the entire apparatus.

FIG. 7 is a flowchart for explaining a measurement order.

[Fig. 8] is a calculation graph of average leg extension power

FIG. 9 is a graph showing Lp length measurement by a drum shaft encoder pulse.

[Explanation of symbols]

 1 Instantaneous force measuring device by leg extension force 2 Base frame 2a Long member 2b Vertical plate 2c Caster 2d Fixed adjuster 3 Box body 3a Strut 3b Plate 4 Drive unit 4a Bracket 4b Rotating shaft 4c Rope drum 4d Return spring 4e 1st sprocket 4f Chain 4g Intermediate shaft mechanism 4g1 Bracket 4g2 Rotating shaft 4g3 Freewheel 4g4 Freewheel sprocket 4g5 3rd sprocket 4h Chain 4i Powder brake mechanism 4i1 Bracket 4i2 Rotating shaft 4i3 4th sprocket 4i4 Powder brake 5 Shaft 5a Slide 5a Guide part 6a Upper guide shaft 6b Lower guide shaft 7 Foot part 7a Insertion hole 7b Slider 7c Bracket 7 d Foot receiving part 7e Foot plate 7f Support part 7f1 Fork part 7g Hole 7h Seal boss 7h1 Insertion hole 8 Measuring unit 8a Drum axis encoder 8b Photo sensor 8c Forward / reverse pulse detection counter 8d Load axis encoder 8e Photo sensor 8f Pulse detection counter 8g Load Current regulator 8h Mode selector switch 8i Processor 9 Display 9a LED display 9b Buzzer 10 Input 11 Rope 12 Card reader / writer for IC card 13 Printer 14 Cabinet 15 Frame 16 Interface circuit M Subject

Claims (1)

[Claims] 1. The amount of work performed on the powder brake, the amount of work equivalent to the inertia energy absorbed by the rotary drive system including the powder brake, the intermediate shaft, and the rope drum shaft, and the motion obtained by the actual foot plate. In addition to the work amount of energy, the footplate maximum velocity Vmax and its appearance time Tmax are obtained, and the power generated by leg extension is obtained from the footplate maximum velocity Vmax and its appearance time Tmax. Measuring method of instantaneous force by leg extension force.