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FIGURE 13-3 The effects of consuming a low-salt or moderate-salt diet and of recurrent exercise in the heat on circulating levels of arginine-vasopressin. All conditions are as noted in Figure 13-1. HA = days of heat acclimation period and T1, T2, and T3 are the first, second, and third blood samples, respectively.

the low-salt group and the concomitant minor increments in PRA in the controls, no further significant differences were noted in any of the other time intervals. Moreover, as the chronicity of heat acclimation increased (days 15 and 17), all effects of the low-salt diet as well as exercise in the heat were negated, and no further intergroup or between-time differences were observed.

During the dietary stabilization period, there were no significant intergroup or across-time differences in levels of AVP (Figure 13-3). Further, even after dietary manipulation and consecutive days of exercise in the heat, the data indicated that throughout the period of heat acclimation there were no significant effects on AVP of either the dietary manipulation or the recurrent exercise in the hot environment.

DISCUSSION

Because the endocrinological variables under consideration in the current experiments are significantly affected by dietary salt consumption (McDougall, 1987), hydration state (Convertino et al., 1981), exercise and training (Geyssant et al., 1981), and thermal exposure (Kosunen et al., 1976), it was considered important that all test subjects undergo an adequate stabi-



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