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Related Experiment Videos

Maximum leg force and power output during short-term dynamic exercise

A J Sargeant, E Hoinville, A Young

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |November 1, 1981
    PubMed
    Summary

    This study found that peak force declines during maximal cycling efforts, with the rate depending on crank velocity. The optimal crank velocity for generating maximum power output was determined to be 110 revolutions per minute.

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    Area of Science:

    • Exercise Physiology
    • Biomechanics

    Background:

    • Understanding the relationship between force, velocity, and power is crucial for optimizing athletic performance.
    • Previous research has explored these relationships, but specific data on short-term maximal efforts at varying crank velocities is needed.

    Purpose of the Study:

    • To measure force and power output during short-term maximal exercise on a modified bicycle ergometer.
    • To determine the relationship between crank velocity and peak force, and identify the velocity for maximal power generation.

    Main Methods:

    • Five subjects performed 20-second maximal efforts at various crank velocities (23-171 rev/min) on a motor-driven ergometer.
    • Force was measured using strain gauges, and power output was calculated by integrating force and pedal velocity.
    • Peak force (PFmax) and maximal power output were analyzed in relation to crank velocity and standardized upper leg muscle (plus bone) volume (ULV).

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    Main Results:

    • Peak force declined during the 20-second effort, with the rate of decline being velocity-dependent.
    • Peak force (PFmax) showed an inverse linear relationship with crank velocity (PFmax (kgf/l ULV) = 27.51 - 0.125 crank velocity (rev/min)).
    • Maximum power output followed a parabolic function of crank velocity, with the optimal velocity for greatest power output identified at 110 rev/min, yielding 840 ± 153 W (85 ± 5 W/l ULV).

    Conclusions:

    • The velocity for maximal power output in short-term cycling exercise is approximately 110 rev/min.
    • Maximal power output is significantly influenced by crank velocity.
    • The measured maximal power output significantly exceeds the calculated maximum mechanical power output from aerobic sources.