Document Detail


Combined effects of pre-cooling and water ingestion on thermoregulation and physical capacity during exercise in a hot environment.
MedLine Citation:
PMID:  16368609     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The aim of the present study was to determine the combined effects of pre-cooling and water ingestion on thermoregulatory responses and exercise capacity at 32 degrees C and 80% relative humidity. Nine untrained males exercised for 60 min on a cycle ergometer at 60% maximal oxygen uptake (VO2max) (first exercise bout) under four separate conditions: No Water intake, Pre-cooling, Water ingestion, and a combination of pre-cooling and water ingestion (Combined). To evaluate the efficacy of these conditions on exercise capacity, the participants exercised to exhaustion at 80% VO2max (second exercise bout) following the first exercise bout. Rectal and mean skin temperatures before the first exercise bout in the Pre-cooling and Combined conditions were significantly lower than in the No Water and Water conditions. At the end of the first exercise bout, rectal temperature was lower in the Combined condition (38.5 +/- 0.1 degrees C) than in the other conditions (No Water: 39.1 +/- 0.1 degrees C; Pre-cooling: 38.7 +/- 0.1 degrees C; Water: 38.8 +/- 0.1 degrees C) (P < 0.05). Heat storage was higher following pre-cooling than when there was no pre-cooling (P < 0.05). The final rectal temperature in the second exercise bout was similar between the four conditions (39.1 +/- 0.1 degrees C). However, exercise time to exhaustion was longer (P < 0.05) in the Combined condition than in the other conditions. Total sweat loss was less following pre-cooling than when there was no pre-cooling (P < 0.001). Evaporative sweat loss in the Water and Combined conditions was greater (P < 0.01) than in the No Water and Pre-cooling conditions. Our results suggest that the combination of pre-cooling and water ingestion increases exercise endurance in a hot environment through enhanced heat storage and decreased thermoregulatory and cardiovascular strain.
Authors:
Hiroshi Hasegawa; Tadashi Takatori; Takashi Komura; Masahiro Yamasaki
Related Documents :
7588699 - Effects of moisture absorption by clothing on thermal responses during intermittent exe...
20087599 - No effect of skin temperature on human ventilation response to hypercapnia during light...
6341749 - Temperature regulation during exercise: directions--1983.
7742769 - Variability of time to exhaustion during submaximal exercise.
6542509 - Effects of facial cooling during exercise at high temperature.
7906109 - The effect of hypothermia on adductor pollicis twitch tension during continuous infusio...
25051209 - Functional performance of female patients more than 6 months after total hip arthroplas...
21871649 - Effects of physical activity on the deposition of traffic-related particles into the hu...
11165529 - Piracetam affects facilitatory i-wave interaction in the human motor cortex.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of sports sciences     Volume:  24     ISSN:  0264-0414     ISO Abbreviation:  J Sports Sci     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-12-21     Completed Date:  2006-05-16     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8405364     Medline TA:  J Sports Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  3-9     Citation Subset:  IM    
Affiliation:
Laboratory of Exercise Physiology, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Japan. hasehiro@hiroshima-u.ac.jp
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Body Temperature Regulation*
Cold Temperature*
Drinking*
Exercise / physiology*
Exercise Test / methods
Humans
Japan
Male
Physical Endurance

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Changes in sexual practices and responses among ante-natal clinic attendees in a Nigerian teaching h...
Next Document:  Impact phase kinematics of instep kicking in soccer.