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[The effect of a 3-day fast on psychophysical functions in young people].

Presented are results of the effect of a complete three-day fasting with permitted optional water intake on some anthropometric, biochemical-metabolic and functional parameters significant in the assessment of psychophysical fitness of healthy, well-developed and normally-nourished young men aged 19.5 years in average. It was found that a three-day complete fasting with average daily energy expenditure of 14.89 MJ resulted in significant body mass reduction, significant glycemia and respiratory quotient decrease, significant blood urea, keto-bodies and triglyceride levels increase and in significantly reduced endurance at strenuous physical work performance.