THE EFFECT OF FOOT-REST POSITION ON THE STRENGTH OF HORIZONTAL PULL BY THE HAND
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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An investigation was conducted to determine the effect of foot-rest position on the strength of horizontal pull by the hand at four different elbow angles. At all elbow-angles the strength of hand pull increased as the thigh was elevated above the horizontal or as the leg was straightened. The effect of foot-rest position on output increased as the arm was straightened. The knee- angle exerted a greater effect on the strength of the hand movement than did the thigh-angle. The results were in agreement with the hypothesis that the strength of hand pull is greatest when the legs are in the position at which they can exert the greatest force against the foot-rest. The force developed by the legs tends to counteract the force exerted by the hand and thus limits the strength of hand pull. In order to maximize the strength of horizontal pull by the hand, the foot-rest should be in such a position as to produce a thigh-angle of approximately 20 degrees above the horizontal and a knee-angle of approximately 150 degrees. The foot-rest position is important even at comparatively low output levels.
- Anatomy and Physiology
- Biomedical Instrumentation and Bioengineering