Influence of Rehydration Levels on Thermoregulation and Body Fluid Retention during Exercise in a Hot Environment

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We examined the influence of rehydration levels on thermoregulation and body fluid retention during exercise in a hot environment. Six male subjects performed 100 min of intermittent exercise at 60% VO2max in a climatic chamber (32℃, 60% relative humidity), while receiving no rehydration (NR), ad libitum rehydration (AD, 549.3 〓 79.5 ml), rehydration sufficient to replace one-half of total sweat loss (R1, 712.2 〓 25.9 ml), and rehydration sufficient to replace total sweat loss (R2, 1429.3 〓 52.8 ml). During NR, AD, R1, and R2, exercise-induced dehydration averaged 2.01 〓 0.16, 1.23 〓 0.15, 1.00 〓 0.13, and 0.06 〓 0.11% body weight, respectively, whereas total sweat loss in each trial averaged approximately 2% body weight. Increased rectal and tympanic temperatures were proportional to a decrease in rehydration levels. Hypovolemia was attenuated in proportion to an increase in rehydration levels; the change in plasma volume was highly correlated with the change in plasma albumin content. In summary, rehydration sufficient to replace total sweat loss is more effective in attenuating hyperthermia and body fluid imbalance than rehydration insufficient to replace total sweat (loss, ad libitum rehydration, and no rehydration during exercise in a hot environment.
兵庫医科大学の論文
2005-04-25