運動時の発汗量と水分摂取量に及ぼす環境温度(WBGT)の影響

概要

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The relationship between environmental conditions and water balance during training for baseball and American football was analyzed. The environmental conditions were assessed in terms of WBGT(wet-bulb globe temperature)based on NDB(natural dry-bulb temperature), NWB(natural wet-bulb temperature)and GT(globe temperature), as WBGT=0.7 NWB+0.2 GT+0.1 NDB. During baseball training, a commercially available sports drink was provided ad libitum, whereas during American football training, the effect of free water intake was compared between tap-water and sports drink. The sweat rate and the amount of water consumption were significantly correlated with WBGT under each experimental condition. Body weight loss was 0.2% body wt./h during baseball training, whereas during American football training, body weight loss was 0.5%/h with tap-water and 0.4%/h with sports drink on average, revealing a significantly higher value for tap-water. These results indicate that both sweat loss and water intake during exercise increase with WBGT, and that body weight loss is maintained at a fairly constant level during exercise with free water intake, although the loss is significantly higher when tap-water is provided.
日本体力医学会の論文
1994-08-01