Effect of inspiratory resistance to prolonged exercise in a hot environment wearing protective clothing |
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Authors: | Maurice Jetté Josée Quenneville James Thoden Sydney Livingstone |
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Affiliation: | (1) School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, 125 University Pr, K1N 6N5 Ottawa, Ontario, Canada;(2) Present address: Department of National Defence, Defence Research Establishment Ottawa, Ottawa, Ontario, Canada |
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Abstract: | The effects of inspiratory resistance on prolonged work in a hot environment wearing a nuclear, bacteriological and chemical warfare (NBCW) mask and overgarment were assessed in 10 males. Subjects walked on a treadmill at 5 km/hr, 2% gradient, until their core temperature reached 39° C or for a duration of 90 min. Rectal temperature, heart rate, ventilation, oxygen consumption and rate of perceived breathing were measured. There were no differences between break-point time without the canister (62.2 ± 21 min) and with the canister (58.9 ± 17 min). Regression analysis indicated that the mean core temperature increased by 0.02° C for every minute of work performed and heart rate by 6 beats/min for every increase of 0.2° C in core temperature. Reduction in heat transfer brought about by wearing the protective overgarment and mask with or without the canister will significantly increase core temperature and limit the performance of moderate work to approximately 1 h in a moderately fit individual. |
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Keywords: | Body temperature regulation Work tolerance Inspiratory resistance Respirator |
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