Relationships between environmental temperature (WBGT) and body weight loss, fluid intake and sweat loss during physical exercise

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Bibliographic Details
Title translated into German:Beziehungen zwischen der Umgebungstemperatur und dem Koerpergewichtsverlust, der Fluessigkeitsaufnahme und dem Schweissverlust bei koerperlicher Belastung
Author:Nakai, S.; Yoshida, T.; Yorimoto, A.; Okamoto, N.; Morimoto, T.
Published in:Japanese journal of physical fitness and sports medicine
Published:43 (1994), 4 , S. 283-289, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Online Access:
Identification number:PU199704204071

Author's 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 = 0.7 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. Verf.-Referat