Skip Navigation LinksHome > May 2003 - Volume 17 - Issue 2 > Thermal Responses and Body Fluid Balance of Competitive Male...
Journal of Strength & Conditioning Research:
Original Article: PDF Only

Thermal Responses and Body Fluid Balance of Competitive Male Swimmers During a Training Session.


Collapse Box


Thermoregulatory and body fluid balance (BFB) responses of competitive swimmers were studied during a typical interval training session under natural field conditions. Sub-jects were 9 males (18.0 +/- 1.7 years; VO2max 5 3.8 +/- 0.9 L[middle dot]min 21) who covered 9,000 m in 180 minutes in an outdoor pool (mean water temperature 5 26.8 +/- 0.38 C; mean wet bulb globe temperature 5 29.8 +/- 2.88 C). Mean body weight (BWt) decreased by 1.8 +/- 0.5 kg (P < 0.05), and rectal tem-perature increased by 1.0 +/- 1.08 C (P < 0.05). Volitional water intake (WI) (0.1 +/- 0.2 kg) did not maintain BFB (20.5 kg per hour) and plasma volume decreased 10.7 +/- 5.4%. During a typical training session, swimmers experienced significant body fluid losses, and WI was not enough to prevent involuntary dehydration. The magnitude of the fluid losses (2.5% of BWt) was sufficient to compromise convective thermoregulation because of the decreased plasma volume. Hence, to prevent involuntary dehydration, swimmers should be encouraged to consume an amount of fluids that equals losses throughout the training sessions.

(C) 2003 National Strength and Conditioning Association



Article Tools


Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.