Journal of Applied Physiology AJP: Lung Cellular and Molecular Physiology
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J Appl Physiol (November 8, 2002). doi:10.1152/japplphysiol.00720.2002
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Articles in PresS, published online ahead of print November 8, 2002
J Appl Physiol, 10.1152/jap.00720.2002
Submitted on August 5, 2002
Accepted on October 31, 2002

Metabolic, thermoregulatory, and perceptual responses during submaximal exercise following lower body and whole body precooling

Andrea T White1, Scott L Davis1*, and Thad E Wilson2

1 Department of Exercise & Sport Science, University of Utah, Salt Lake City, UT, USA
2 Department of Biomedical Sciences, Southwest Missouri State University, Springfield, MO, USA

* To whom correspondence should be addressed. E-mail: s.l.davis{at}m.cc.utah.edu.

The purpose of this investigation was to compare the thermoregulatory, metabolic, and perceptual effects of lower body (LBI) and whole body (WBI) immersion precooling techniques during submaximal exercise. Eleven healthy males completed two 30 min cycling bouts at 60% VO2max preceded by immersion to the suprailiac crest (LBI) or clavicle (WBI) in 20°C water. WBI produced significantly lower rectal temperature (Tre )during min 24-30 of immersion and Tre, mean skin temperature (Tsk ), and mean body temperature (Tb ) for the first 24, 14, and 16 min of exercise, respectively. Body heat storage rates differed significantly for LBI and WBI during immersion and exercise, although no net differences were observed between conditions. For WBI, metabolic heat production and heart rate were significantly higher during immersion, but not exercise. Thermal sensation was significantly lower (felt colder) and thermal discomfort was significantly higher (less comfortable) for WBI during immersion and exercise. In conclusion, WBI and LBI attenuated Tre increases during submaximal exercise and produced similar net heat storage over the protocol. LBI minimized metabolic increases and negative perceptual effects associated with WBI.




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