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Abstract
Fatigue has been discussed both in physiological and psychological tonus. Undoubtedly these two aspects of fatigue interact upon each other and it may be difficult to distinguish between the two.
It is known that a certain degree of change in human functions caused by work-load may result in lowered activity, and produce a subjective feeling of fatigue. For fatigue evaluation, the latter may serve only as a reference, while the former may be measured in terms of performance, which must be a combined output of mental activity and physiological functions. A solution to this problem may be the TAF-test, which has been devised as a now quantitative fatigue test based on the concept of TAF. The average level of the TAF curve (TAF-L.) and its standard deviation (TAF-D) are compared for pre-and post-work values and/or among different groups statistically.
As to the qualitative or psychological aspect, it is generally accepted that stress stimuli bring about certain neurophysiological changes. At present, the mecholyl test is recognized as a reliable means of showing the strength of homeostatic defence in the hypothalamus. However, in comparison to the dangers of the mecholyl test, the CPT-swing degree, which we have developed, may safely be used to identify the qualitative nature of the stress.
It is concluded that fatigue can be dealt with quantitatively by the TAF-test and qualitatively by the CPT-swing degree.