THE EFFECT OF FOOT-REST POSITION ON THE STRENGTH OF HORIZONTAL PULL BY THE HAND

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Abstract:

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.

Author(s):
Caldwell, Lee S.
Author Organization(s):
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
Pagination:
0029

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
USAMRL-423
Task Number(s):
03
Project Number(s):
USAMRL-6X95-25-001
Monitor Series:
USAMRDC
 Subject Terms
Joint Capability Areas:
JCA_3_Force Application; JCA_3.1_Maneuver; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_3.1.1_Maneuver to Engage; JCA_1.2.3_Educating; JCA_3.1.2_Maneuver to Insert; JCA_5_Command and Control; JCA_2_Battlespace Awareness; JCA_2.1_Planning and Direction; JCA_3.2_Engagement; JCA_2.1.4_Evaluation; JCA_3.2.1_Kinetic Means; JCA_4.6_Engineering; JCA_6.4.1_Secure Information Exchange; JCA_5.3_Planning; JCA_6_Net Centric; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_6.4_Information Assurance; JCA_5.1.3_Foster Organizational Collaboration
Communities of Interest:
Biomedical
Descriptor(s):
*HANDS, STABILIZATION, PERFORMANCE(HUMAN), STRENGTH(PHYSIOLOGY), HUMAN FACTORS ENGINEERING, DYNAMOMETERS, FORCE(MECHANICS), FEET, LEGS, MOORING, PSYCHOPHYSIOLOGY, SEATS, POSTURE(PHYSIOLOGY)
Field(s)/Group(s):
Anatomy and Physiology, Biomedical Instrumentation and Bioengineering
Report Date:
1960 Jan 10