Human Output Characteristics during Specific Task Performance in Reduced Traction Environments

Abstract

Alterations in the force and work producing characteristics of unbraced operators performing in reduced traction environments have been reported. Data descriptive of the capabilities and requirements of man in such environments would prove invaluable in designing future space systems. To facilitate the acquisition of such data, a study was executed which examined the effects of varying levels of instability upon the amplitude, rate and efficiency with which manual work was produced. Ten subjects exercised in a special suspensory system. Work output/metabolic input ratios were determined at varying levels of stability. Data were subjected to analyses via Duncan's Multiple correlation test. Significant increases, of up to 70 per cent in oxygen consumption per horsepower developed were found. The ratio increased in non-linear fashion as instability was increased. Decreases in output capability were also found.