PSYCHOPHYSICAL STUDIES OF PHYSIOLOGICAL FATIGUE CRITERIA

A laboratory experiment and a field study were conducted using psychophysical methods for among investigators with regard to physiological criteria used for excessive fatigue, (2) a poor relationship between physiological measures of fatigue and measures of performance, and (3) a good relationship between subjective measures of fatigue and measures of performance. A laboratory experiment and a field study were conducted using psychophysical methods for determining fatigue criteria. Heart rate was measured during these studies as an indication of the physiological level of functioning and was compared with fatigue criteria suggested by other investigators. The consistency of the results in the field study and three replications of the laboratory study demonstrated the reliability of the psychophysical methodology. © 1969, Human Factors and Ergonomics Society. All rights reserved.