Abstract
The purpose of this study was to investigate the interrelation of dynamic force, velocity and power during a concentric contraction in human muscle. Voluntary maximum elbow extension was adopted as a concentric contraction in this study. A special electronic signal processor was designed for calculating dynamic force, instantaneous velocity and instantaneous power from the value of the acceleration at the wrist. The subjects used in this study were five healthy men. The results obtained were as follows; 1) The values of dynamic force, instantaneous velocity and instantaneous power during a concentric contraction changed separately every milli-second. It was confirmed that the constant-force contraction and the constant-velocity contraction were showed to be absent. 2) The dynamic force-velocity curve and the instantaneous power-velocity curve during a concentric contraction were recorded. It was became clear that the maximum dynamic force appeared in accordance with 30-45% of the maximum velocity and the maximum power appeared in accordance witn 80-85% of the maximum velocity.
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