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ERIC Number: ED083138
Record Type: RIE
Publication Date: 1973-Apr
Pages: 7
Abstractor: N/A
Reference Count: 0
Effects of Rate of Movement on Effective Maximal Force Generated by Elbow Extensors.
Updyke, Wynn F.; And Others
This study investigated the effects of the velocity of muscular contraction on the effective force (torque) exerted by forty 18- to 21-year-old males. The dynomemeter lever arm, the fulcrum of which was aligned with the axis of elbow rotation, allowed extension and flexion for the subjects. All subjects were tested at three velocities (.10, .20, and .33 radians/sec) for each mode of contraction: concentric and eccentirc. Subjects tested in the concentric mode accelerated the lever arm by contraction of the elbow extensors, while subjects in the eccentric mode resisted elbow flexion forced upon them by the dynomometer. The hypothesis that forces observed would have an inverse relationship to the speed of muscle shortening or lengthening was rejected. Analysis revealed similar force curves at all speeds, in terms of peak forces and slopes of the curves. Mean peak forces occurred approximately at the same point in the curves, regardless of mode or speed. Eccentric forces were consistently higher than concentric forces. It was concluded that subtle adaptations in the muscoloskeletal linkages resulted in relatively constant force output, regardless of variations in rate of muscle shortening. (Author/BRB)
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A