JP2533413B2 - Instantaneous force measurement device based on leg extension force - Google Patents

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 the 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 device that measures 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 jumping 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
There is a demand for a method and an apparatus for measuring physical strength safely and accurately, and studies are being made to create an index of physical strength based on power theory. In 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, AEROIKE and P
OWERMAX (both are registered trademarks and pending trademarks of Combi Co., Ltd., the former is registered No. 1840771 and the latter is traded 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 the 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 efficiency of power output is good. It has features. On the other hand, even in continuous leg strength exercises such as a bicycle or other similar multi-joint exercises, in movements such as suddenly jumping 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, Shoukai 63-18103.
There is a method in which the leg extension force is received by a hydraulic cylinder or an air cylinder and the physical strength of the subject is measured 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 points in 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, we used a powder brake to shorten the kickout time of the foot plate as much as possible compared to the conventional power measuring device of non-lactic acid-based anoxic energy mechanism. It is an object of the present invention to provide a device for measuring instantaneous force by 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 by 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 an instantaneous force measuring device using a leg extension force, which eliminates a change in load during measurement and stabilizes the measurement.

Furthermore, since the refraction angle 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 an instantaneous force measuring device based on leg extension force that automatically follows the following. 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 leg extension shown in (a) and (b), and from the relationship of the equation of motion, the powder brake load is equivalent to the weight gravity applied to the middle and lower limbs of the vertical jump, and the inertial mass Wo / g is the vertical jump. It is equivalent to the mass of the upper limb that is exerted on 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 horizontally moving upper limb. For example (It is said that about 70% of the body weight is the upper limb mass of the human body.) For a person of 65 kg, the equivalent weight of the foot plate is 40 Wg to 50 Kg, which is equivalent to 46 Kg, and the equivalent mass of the foot plate is 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 as the weight 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 makes the structure complicated and the operation is not easy. Furthermore, in the conventional power calculation, it is usual to calculate the instantaneous power due to the leg extension force from the work done for the brake load, but in such a calculation, the time when kicking with full force is very short (0 , 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 with various leg extensions.

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 provides a base frame in which elongated members are arranged in parallel, and a box body provided above a rear portion of the base frame.
A drive unit incorporated inside the box body, a seat above the drive unit for seating a subject on the top surface of the box body, and a base end above the front surface of the box body And a guide portion extending between the vertical direction of the base frame and provided between the vertical plates erected at the tip of the base frame, and a foot portion having an angle that slides back and forth along the guide portion. A measurement unit for measuring the sliding condition of the foot portion, a display unit for visually or audibly displaying various data of the subject's leg extension measured by the measurement unit, and required by the subject for measurement. And an input unit for inputting predetermined data.

[0013]

Since the present invention employs the above-mentioned measuring device, it is possible to measure the instantaneous force with a full-power kick for an extremely short time with respect to the foot plate, and the physical movement of the subject due to the very natural motion system by the kick of the foot plater. 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-described full-force kick movement, it is possible to measure the instantaneous force due to the leg extension force of the dynamic single-shot articulated movement such as vertical jump.

[0015]

EXAMPLES Below, FIGS. 3, 4, 5, 6, 7 and 8
And the instantaneous force measuring device 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. 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 Lp length measurement by the drum axis encoder pulse.

In the figure, reference numeral 1 is an instantaneous force measuring device based on the leg extension force according to the present invention. The instantaneous force measuring device 1 based on the leg extension force includes a base frame 2 in which two long members (a metal square bar is used in this embodiment) 2a are arranged in parallel,
Box 3 provided at the rear of the base frame 2 and the box 3
A drive unit 4 incorporated in the interior of the box, a seat 5 above the drive unit 4 for seating a subject M placed on the upper surface of the box 3, and above the front of the box 3. With the base end extending in the same direction as the base frame 2,
Also, a guide portion 6 provided between the vertical plates 2b provided upright at the tip of the base frame 2, a foot portion 7 that slides back and forth along the guide portion 6, and a measurement for measuring the sliding condition of the foot portion 7. A unit 8, a display unit 9 for visually or audibly displaying various data of the subject M's leg extension measured by the measuring unit 8, and predetermined data required by the subject M for measurement are displayed. A main part is constituted by the input unit 10 for inputting.

The two elongated members 2a constituting the base frame 2 are arranged in parallel with each other at a constant interval on the left and right,
Two adjusters 2c that can be adjusted up and down are arranged on the left and right of the rear ends of both elongated members 2a, and the lower position of the front surface of the box body 3 and the vertical plate 2b erected at the tip of the base frame 2 are arranged. The base frame 2 is located directly below and to the left and right.
There are four fixed adjusters 2d arranged in the front-rear direction and the left-right direction for horizontally holding and stably fixing.

The box body 3 is constructed by arranging plates 3b around four columns 3a which are vertically provided upright on the rear side of the base frame 2. In addition, 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 3 toward the front, and the rope drum 4c. An adjacent return spring 4d (the return spring 4d has a tubular spring as shown in the figure), 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 (the intermediate shaft mechanism 4g is a rotating shaft 4g2 that is inserted into left and right brackets 4g1 that are erected at a substantially central position inside the box body 3; The free wheel 4g3 mounted on the rotary shaft 4g2 is built in, and is composed of a free wheel sprocket 4g4 wound around the chain 4f and a third sprocket 4g5 similarly fixed to the rotary shaft 4g2.)
And a powder brake mechanism 4i which is rotated in one direction via a chain 4h wound around the third sprocket 4g5, and the powder brake mechanism 4i includes a bracket 4i1 which is erected at an inner rear position of the box body 3, It is composed of 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 a powder brake 4i4 rotated by the rotary shaft 4i2. .

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 adjusting 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 protruding from the upper surface of the box body 3, the shaft 5a is slid back and forth with 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 a base end is horizontally arranged between the vertical plates 2b erected at the tip of the base frame 2. The left and right upper guide shafts 6a that are laid across the base plate 2 and the vertical plate 2 that extends in the same direction as the base frame 2 with the upper front side of the box body 3 as the base end and that is 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 slanted so as to lower the front between b.

Further, 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. In the center of the rear part, the rope 11 wound around the rope drum 4c described above.
One end of the slider 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.
In e, the supporting portion 7f, which is provided so as to project below the foot receiving portion 7d, is faced downward through a hole 7g formed in the central portion of the slider 7b, and a lower guide is inserted into an insertion hole 7h provided at the lower end of the supporting portion 7f. By inserting and guiding the shaft 6b, the angle of the foot receiving portion 7d of the foot plate 7e that moves back and forth is set to an optimum angle according to the leg extension of the subject M.

The measuring unit 8 for measuring the sliding condition of the foot portion 7 includes a drum shaft encoder 8a fixed to the 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 4i2 of the powder brake mechanism 4i.
A load shaft encoder 8d fixed to the load shaft encoder 8d, a photosensor 8e for detecting the rotation of the load shaft encoder 8d, and a load shaft rotation pulse detection counter 8f for detecting the rotation of the powder brake 4i4, and the powder brake 4i4.
Load current adjuster 8g for adjusting the current of, and pulse signals from both pulse detection counters 8c and 8f,
An arithmetic processing unit 8i that calculates a leg extension force when the subject M repeatedly kicks the foot plate 7e a proper number of times based on a mode signal selected by the mode changeover switch 8h and a data signal input from an input unit 10 described later. (Hereinafter, referred to as a microcomputer), the measuring unit 8 includes a drum shaft encoder 8a, a photo sensor 8b and a load shaft encoder 8d for detecting the number of rotations of the drum shaft encoder 8a, and the load shaft encoder. The components other than the photo sensor 8e that detects the rotation of 8d are
Card reader / writer for IC card 1 at an appropriate place
2 and is incorporated inside a cabinet 14 equipped with a printer 13 for recording the results of the measurements. The card reader / writer 12 and the printer 13 for the IC card are adopted so that the weight input data and power output data of the subject M can be easily managed by the host computer.

In the present embodiment, the cabinet 14 is mounted on a frame 15 detachably erected on the side portion of the base frame 2a described above, and is easily operated by a subject M who is seated on the seat 5. It is located in a position. Further, for displaying visually or audibly the 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 to brake the forward slide of the foot plate 7e kicked out by the subject M (the leg of the subject M). Of the so-called automatic brake mechanism capable of detecting Vmax of the foot plate 7e in real time) is used for 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 the inertial impact generated at the end of kicking of the foot plate 7e and to be stable. It is configured to be able to make measurements.

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 that 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 photo sensor 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, for accurate measurement, the rotary shaft 4b of the rope drum 4c, the rotary shaft 4g2 constituting the intermediate shaft mechanism 4g, and the equivalent mass of the rotary system such as the powder brake 4i4 are calculated and obtained. .

[0027]

[Equation 1]

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

[0029]

[Equation 2]

When the equation of motion of the leg extension is obtained, the leg extension force is estimated, that is, the leg extension force is estimated from the maximum velocity Vmax of the foot plate and the appearance time Tmax from the rotation of the drum shaft encoder 8a and the load shaft encoder 8d described above. The power generated by the leg extension of the person M is obtained, and the rotation system including the powder brake 4i4, the rotating shaft 4g2 of the intermediate shaft mechanism 4g, and the rotating shaft 4b of the rope drum 4c is added to the work done for the powder brake 4i4. The work amount of the inertial 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.
At this time, in order to prevent a miscount due to the movement of the foot during extension, the upcount C _u is discriminated from each other, and the downcount C _D is discriminated from the downcount C _D to give an appropriate hysteresis.

[0037]

(Equation 7)

In the above calculation, considering that the foot plate reaction force generated in 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, Even in the instantaneous force measuring device using 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 operation of the instantaneous force measuring device based on the leg extension force according to the present invention will be described based on the above embodiment.

[0039]

[Operation of the device] The instantaneous force measuring device 1 based on the leg extension force is operated by the subject M seated on the seat 5 in the foot plate 7e.
It is done by kicking the ball forward. The foot plate 7e kicked forward by the subject M is
A support portion 7f that hinges to the slider 7b swingably and 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 to 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 with the forward movement. 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 which are provided on one side of the rotating 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 forward by the subject M is such that when the leg of the subject M reaches the position measured by the leg, the foot is pulled by the weight of the foot plate 7e. The powder brake 4i4 is braked and stopped so as not to be disturbed. 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 in a very smooth manner, 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 also 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 unit 9 to measure the measurement mode, for example, the A mode (shown by the figure M in the flowchart (see the figure)). Mode in which the user enters his / her own weight with the key to start measurement), B mode (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. The 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 indicator 9a is switched from the flash to the stationary lighting, and the subject M is notified that the length measurement is completed.

The above-mentioned 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 us 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. If 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 in accordance with, for example, the sound of the buzzer 9b, and the subject M measures by kicking out the foot plate 7e at the same time as 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. 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 rest for 20 seconds 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 ready to be measured. 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 on 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, and from the maximum velocity Vmax of the foot plate 7e and its appearance time Tmax, The average power generated by the leg extension of the examiner M is measured. (8) Then, when the measurement of the above-mentioned first step to the fifth step 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 load mechanism of constant torque and low inertia, and the instantaneous force is measured by the full force kick for the foot plate for a very short time. Due to the very natural movement system by kicking, the subject's physical load is small, and the leg extension force of the subject can be easily measured and the accuracy of the instantaneous force is very high. The above-mentioned full-strength kick exercise has various excellent effects such that the instantaneous force of dynamic single-joint multi-joint movement such as vertical jump can be measured operationally.

[Brief description of drawings]

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

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 a main part of a drive unit of the device.

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 measurement of Lp by a drum shaft encoder pulse.

[Explanation of symbols]

 1 Instantaneous force measurement device by leg extension force 2 Base frame 2a Long member 2b Vertical plate 2c Adjuster 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 First 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 5b Seat 5a 5a Seat 5a Guide part 6a Upper guide shaft 6b Lower guide shaft 7 Foot part 7a Insertion hole 7b Slider 7c Bracket 7d Foot support 7e Foot plate 7f Support 7g Hole 7h 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 Changeover switch 8i Processor 9 Display 9a LED display 9b Buzzer 10 Input 11 Rope 12 IC card reader / writer 13 Printer 14 Cabinet 15 Frame 16 Interface circuit M Subject

Claims (8)

(57) [Claims] 1. A base frame in which elongated members are arranged in parallel, a box body provided at a rear portion of the base frame, a drive unit incorporated in the box body, and an upper part of the drive unit. A seat on the upper surface of the box for seating a subject, and a vertical surface extending in the same direction as the base frame with the front surface of the box as a base end and standing upright at the tip of the base frame. A guide portion provided between the plates, a foot portion having a variable sliding angle along the guide portion, a drum shaft encoder fixed to the rotation shaft of the rope drum, and a rotation speed of the drum shaft encoder are detected. Rope drum with a photo sensor
A reverse rotation pulse detection counter, a load shaft encoder fixed to the rotating shaft of the powder brake mechanism, and a load shaft rotation pulse detection counter for detecting the rotation of the powder brake, which includes a photo sensor for detecting the rotation of the load shaft encoder, The load current adjuster for adjusting the current of the powder brake, the pulse signal from the above-mentioned pulse detection counters, the mode signal selected by the mode changeover switch, and the data signal input from the key input unit A measurement unit configured to include a processing device that calculates a leg extension force when the foot plate repeatedly kicks the foot plate a proper number of times, and a leg extension of the subject measured by the measurement unit. Display unit that visually or audibly displays various data according to the That predetermined data instantaneous power measuring device according to leg extension force, characterized in that is constituted by an input unit for inputting. 2. The two long members constituting the base frame are arranged in parallel at a constant interval on the left and right, and two adjusters which can be adjusted up and down are arranged on the left and right sides of the rear ends of both the long members. And the lower position of the front of the box,
At the right and left positions directly below the vertical plate that is erected at the tip of the base frame, there are four fixed adjusters for holding the base frame horizontally and stably fixed, front and rear, left and right for convenience. The instantaneous force measuring device by the leg extension force according to claim 1. 3. The drive unit, wherein a rope drum around which a rope, which will be described later, is wound is inserted through a rotary shaft arranged between brackets standing upright on the left and right of the inside of the box, and a return spring attached to the rope drum. A first sprocket arranged on one side of the rope drum, an intermediate shaft mechanism rotated in one direction through a chain wound around the first sprocket, and a chain wound around the intermediate shaft mechanism. And a powder brake mechanism that is rotated in one direction. 4. A seat for seating an examinee, which is arranged on the upper surface of the box, is a left and right shaft in which parallel adjust guide shafts arranged on the left and right of the lower surface of the seat are projected on the upper surface of the box. The device for measuring instantaneous force by leg extension force according to claim 1, wherein the device is configured to be slid back and forth by a predetermined width by being inserted into the receiving portion so that the seated position of the subject can be adjusted to an optimum position. 5. A guide portion formed by extending in the same direction as the base frame with the upper front side of the box body as a base end, is horizontally installed between vertical plates erected at the tip of the base frame. Of the upper guide shaft and the upper part of the front side of the box body as the base end and extending in the same direction as the base frame, and tilted so that the front is lowered between the vertical plates erected at the tip of the base frame. The instantaneous force measuring device by leg extension force according to claim 1, characterized by comprising a central lower guide shaft laid across the bridge. 6. A foot portion that slides back and forth along the guide portion includes a slider that slides horizontally in the front and rear by inserting through the through holes provided in the upper guide shaft, and one end at the center of the rear portion of the slider. The back of the rope is tied and the other end is swingably hinged with a rope that is wound around the rope drum at the other end and a bracket that stands upright in front of the slider. The foot plate has a support portion projecting downward from the foot receiving portion, and the support portion is made to face downward through a hole formed in the central portion of the slider, and is inserted at the lower end of the support portion. By inserting the lower guide shaft through the hole and guiding it, the angle of the foot receiving part of the foot plate that moves back and forth is configured to be displaced to the optimum angle according to the leg extension of the subject. Instantaneous force measuring device according to leg extension force of claim 1. 7. The measurement unit includes an IC at an appropriate location.
A card reader / writer for a card and a printer for recording the result of measurement are equipped, and these ICs
2. A device for measuring instantaneous force by leg extension force according to claim 1, wherein output data of a card reader / writer for a card and a printer is connected to an external host computer for management. 8. The forward movement of the foot plate utilizes length measurement of a subject's leg to prevent the inertial impact generated at the end of kick by braking the powder brake at the end of kick of the foot plate. It is constituted, It is characterized by the above-mentioned.
Device for measuring instantaneous force by leg extension force.