Changes in exercise and post-exercise core temperature under different clothing conditions |
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| Authors: | Glen P Kenny Francis D Reardon Jim S Thoden Gordon G Giesbrecht G Kenny |
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| Institution: | (1) University of Ottawa, Faculty of Health Sciences, School of Human Kinetics, Ottawa, Canada K1N 6N5, CA;(2) University of Manitoba, Faculty of Physical Education, Laboratory for Exercise and Environmental Medecine, Winnipeg, Canada R3T 2N2, CA;(3) University of Ottawa, Faculty of Health Sciences, School of Human Kinetics, Room 376, Montpetit Hall, Ottawa, Ontario, Canada K1N 6N5, CA |
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| Abstract: | This study evaluates the effect of different levels of insulation on esophageal (T
es) and rectal (T
re) temperature responses during and following moderate exercise. Seven subjects completed three 18-min bouts of treadmill exercise
(75% VO2max, 22°C ambient temperature) followed by 30 min of recovery wearing either: (1) jogging shoes, T-shirt and shorts (athletic
clothing); (2) single-knit commercial coveralls worn over the athletic clothing (coveralls); or (3) a Canadian Armed Forces
nuclear, bacteriological and chemical warfare protective overgarment with hood, worn over the athletic clothing (NBCW overgarment).
T
es was similar at the start of exercise for each condition and baseline T
re was ∼0.4°C higher than T
es. The hourly equivalent rate of increase in T
es during the final 5 min of exercise was 1.8°C, 3.0°C and 4.2°C for athletic clothing, coveralls and NBCW overgarment respectively
(P<0.05). End-exercise T
es was significantly different between conditions 37.7°C (SEM 0.1°C), 38.2°C (SEM 0.2°C and 38.5°C (SEM 0.2°C) for athletic
clothing, coveralls and NBCW overgarment respectively)] (P<0.05). No comparable difference in the rate of temperature increase for T
re was demonstrated, except that end-exercise T
re for the NBCW overgarment condition was significantly greater (0.5°C) than that for the athletic clothing condition. There
was a drop in T
es during the initial minutes of recovery to sustained plateaus which were significantly (P<0.05) elevated above pre-exercise resting values by 0.6°C, 0.8°C and 1.0°C, for athletic clothing, coveralls, and NBCW overgarment,
respectively. Post-exercise T
re decreased very gradually from end-exercise values during the 30-min recovery. Only the NBCW overgarment condition T
re was significantly elevated (0.3°C) above the athletic clothing condition (P<0.05). In conclusion, T
es is far more sensitive in reflecting the heat stress of different levels of insulation during exercise and post-exercise than
T
re. Physiological mechanisms are discussed as possible explanations for the differences in response.
Received: 30 June 1998 / Accepted: 19 February 1999 |
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| Keywords: | Heat stress Rectal temperature Skin temperature Clothing insulation |
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