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dehydration (Adolph and Associates, 1947; Greenleaf and Sargent, 1965), but a more appropriate term would be involuntary dehydration or involuntary hypohydration, because the delay in drinking is not cognitive; the stimulus is just insufficient (Greenleaf, 1966).

FIGURE 15-3 Mean (± standard error) water intake, sweat rate, and involuntary dehydration (fluid deficit) during the daily 2-h exercise (75 W) acclimation exposure in the control (ambient temperature, 28.8°C) and hot (ambient temperature, 39.8°C) environments. Dashed and solid lines are mean levels for the eight control and acclimation datum points, respectively. *Significantly different (P < 0.05) from control data; Significantly different (P < 0.05) from the day-1 data point. Source: Greenleaf et al. (1983), with permission.

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