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Method for measuring instantaneous power generated by a leg extending force
| Details |
Inventors: Tsuchiya, Kunimasa; Ito, Masao;
Assignee: Combi Corporation (Tokyo, JP)
Primary Examiner: Apley; Richard J.
Assistant Examiner: Leubecker; John P.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A method of and apparatus for measuring physical strength by dynamically measuring the instantaneous power of a nonrepetitive muscular force as, for example, the force exerted by a leg extension, on the basis of a power theory and, consequently, the instantaneous power generated by a dynamic, nonrepetitive multi-articular movement such as a vertical jump. Work equivalent to an inertial energy is absorbed by a rotary drive system. This work is then added with an amount of work equivalent to the kinetic energy absorbed by a foot plate, the sum being added to the work done to a powder brake to obtain the maximum speed V.sub.max of the foot plate and its output time T.sub.max. Finally, the power produced by a leg extension is calculated from the maximum speed V.sub.max of the foot plate and its output time T.sub.max. |
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DETAILED DESCRIPTION The present invention has been made in view of the above considerations and is directed to the accurate measurement of instantaneous power by the power theory, whereby unstable factors involved in the measuring system are eliminated to the extent possible.
An object of the invention is to provide an apparatus for and method of measuring the instantaneous power generated by a leg extending force, in which a powder brake is used to reduce the influence of inertia on the power measurement.
The present invention, as compared with conventional power measurements based on non-lactic acid-type anaerobic energy mechanisms, attempts to minimize the time required to push a foot plate, so that stress on the user or subject involved in the measurement is attendantly reduced.
Another object is to provide a method for measuring an instantaneous power generated by a leg extending force, in which a device used to produce a load is of a constant torque type rather than a hydraulic or dynamo type whereby the load is varied by the foot-pressing speed.
In view of the fact that the response time of the load to the powder brake is approximately 200 ms, it is difficult to change the load during a measurement whose duration is approximately 0.
3 seconds.
Thus, a constant-torque system is proposed to increase measurement accuracy.
The present invention employs this system and attempts to eliminate load variations during measurement, thereby stabilizing the measurement.
A further object is to provide a method of and apparatus for measuring the instantaneous power generated by a leg extending force, in which the angle of the foot plate is automatically varied in accordance with the amount of leg extension.
In conventional apparatus, the angle of the foot plate is fixed, making the foot-pressing force unstable because of changes in the angle of inclination of the subject's foot during leg extension.
To achieve the above objects, attention is paid to the fact that the relationship between the foot plate reaction produced by a vertical jump and the speed of the center of gravity of a subject, as shown in FIGS
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