Physiological significance of hydrophilic and hydrophobic textile materials during intermittent exercise in humans under the influence of warm ambient temperature with and without wind |
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Authors: | Aehyun Kwon Masako Kato Hiroko Kawamura Yuichi Yanai and Hiromi Tokura |
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Institution: | (1) Department of Environmental Health, Nara Women's University, Nara 630, Japan, JP;(2) Research Institute of Human Engineering for Quality Life, Osaka 530, Japan, JP;(3) Nishinbo Industries, Miai Research Institute, Miai 444, Japan, JP |
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Abstract: | The purpose of this present study was to compare the physiological effects of the hydrophilic and hydrophobic properties
of the fabrics investigated in exercising and resting subjects at an ambient temperature of 30°C and a relative humidity of
50% with and without wind. Three kinds of clothing ensemble were tested: wool and cotton blend with high moisture regain (A),
100% cotton with intermediate moisture regain (B), 100% polyester clothing with low moisture regain (C). The experiments were
performed using seven young adult women as subjects. They comprised six repeated periods of 10-min exercise on a cycle ergometer
at an intensity of 40% maximal oxygen uptake followed by 5 min of rest (20 min for the last rest). The experiments comprised
two sessions. During session I (first three repetitions of exercise and rest) the subjects were exposed to an indifferent
wind velocity and during session II (last three repetitions of exercise and rest) they were exposed to a wind velocity of
1.5 m · s−1. Rectal temperature and skin temperatures at eight sites, pulse rate and clothing microclimate were recorded throughout the
whole period. The main findings can be summarized as follows: rectal temperature during session II was kept at a significantly
lower level in A than in B and C. Clothing microclimate humidity at the chest was significantly lower in A than in B and C
during session II. Skin and clothing microclimate temperatures at the chest were significantly lower in A than in B and C
during session II. Pulse rate was significantly higher in C than in A and B during sessions I and II. It was concluded that
the hydrophilic properties of the fabrics studied were of physiological significance for reducing heat strain during exercise
and rest especially when influenced by wind.
Accepted: 3 June 1998 |
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Keywords: | Hydrophilic and hydrophobic fibre Clothing microclimate Wind effect Heat strain Rectal temperature |
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