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Summary form only given, as follows. In the recent years, considerable effort has been expended in determining a quantitative measure of fatigue, and various attempts to correlate psycilological measures with fatigue have not been successful. In this paper, a positive correlation between quantitative characteristics of speech data and fatigue measures is shown to exist. Since both the motor and speech actions of the human brain are directly affected by physical fatigue, although varying from person to person, a voice technique is shown to be the most natural and personalized method to measure fatigue.