Physical performance of women following heat-exercise hypohydration.

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Abstract
Twelve healthy women, ages 22 to 33, underwent a 5-month physical training period before being divided into two groups, a control group and a hypohydrated (water-depleted) group. Hypohydration was achieved with the subjects alternately resting and walking (4.8 km/hr) at 49 C until they lost about 3.3% of their body weight. They were then given various physical performance tests to assess the effect of the hypo-hydration. Statistically significant changes (P < 0.5) in the hypohydrated group were observed in a) resting pulse rates, b) recovery pulse rates following a modified Harvard step test, and c) the pulse rates and systolic and diastolic blood pressures during a standard 70[degree]tilttable test. No significant decrements were noted in submaximal O2 intakes, submaximal Ve, total body reaction times, and maximal isometric muscular strength. The submaximal ventilatory exchange ratio was unchanged. It was concluded that there was some deterioration in the cardiovascular system response but there was no gross deterioration in physical performance following 3.3% hypohydration in fit, young women.