APPRAISAL OF KIND AND DEGREE OF PHYSICAL EFFORT REQUIRED OF TANK CREWS IN RELATION TO FATIGUE
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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The order of magnitude of work rates for crew members in the tanks M4A3, M5, M24 and T23 has been determined. Changes already accomplished in design have reduced these work rates in certain tanks. The greater ease and efficiency of crew operation thereby attained will probably result in lessened crew fatigue, particularly when the associated stress and strain is great as is generally the case in combat. Furthermore, the work rates determined constitute a significant contribution to the heat load of crews operating in tropical climates and any measures that diminish the rates will allow greater climatic heat tolerance and improve military effectiveness in that regard. In no case studied was any decrease in mechanical operating efficiency noted as a result of measures reducing crew work rates. It has been recommended that agencies and individuals concerned in tank design promote efforts to reduce work rates, and that any agencies or individuals concerned with the design of tank crew equipment, particularly clothing, take cognizance of the contribution of work rate to the heat load of crews.
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