Relationships between environmental temperature(WBGT) and body weight loss, fluid intake and sweat loss during physical exercise.
- VernacularTitle: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
- Author:
SEIICHI NAKAI
;
TETSUYA YOSHIDA
;
AKIRA YORIMOTO
;
NAOKI OKAMOTO
;
TAKETOSHI MORIMOTO
- Publication Type:Journal Article
- Keywords:
sports training;
weight loss;
drinking;
sweat loss;
WBGT
- From:Japanese Journal of Physical Fitness and Sports Medicine
1994;43(4):283-289
- CountryJapan
- Language:Japanese
-
Abstract:
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=0.7NWB+0.2GT+0.1NDB,
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.
