Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditions
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1999
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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HEAT; BODY-TEMPERATURE-REGULATION; IMMERSION; HUMIDITY; CYCLING; MAN; COMPARATIVE-STUDY
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-668
(Last edited on
2002/02/27 18:44:59 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The aim of this study was to establish the effect that pre-cooling the skin without a concomitant reduction in core temperature has on subsequent self-paced cycling performance under warm humid (31 degrees C and 60 % relative humidity) conditions. Seven moderately trained males performed a 30 min self-paced cycling trial on two separate occasions. The conditions were counterbalanced as control or whole-body pre-cooling by water immersion so that resting skin temperature was reduced by approximately 5-6 degrees C. After pre-cooling, mean skin temperature was lower throughout exercise and rectal temperature was lower (P < 0.05) between 15 and 25 min of exercise. Consequently, heat storage increased (P < 0.003) from 84.0 +/- 8.8 W.m-2 to 153 +/- 13.1 W.m-2 (mean +/- s mean) after pre-cooling, while total body sweat fell from 1.7 +/- 0.11.h-1 to 1.2 +/- 0.11.h-1 (P < 0.05). The distance cycled increased from 14.9 +/- 0.8 to 15.8 +/- 0.7 km (P < 0.05) after pre-cooling. The results indicate that skin pre-cooling in the absence of a reduced rectal temperature is effective in reducing thermal strain and increasing the distance cycled in 30 min under warm humid conditions.
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