International Journal of Human Ecology

The Korean Home Economics Association (대한가정학회)
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Thermophysiological Responses to the Alternation of Exercise and Rest at $20^{\circ}C$ when Wearing Underwear made of Cotton or Wool

  • Park Shin-Jung (Dept. of Fashion Design, Sungkyunkwan University) ;
  • Chang Jee-Hye (Dept. of Fashion Design, Sungkyunkwan University) ;
  • Tokura Hiromi (Institute of Textiles & Clothing, The Hong Kong Polytechnic University)
  • Published : 2005.12.01
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Abstract

The purpose of this study was to investigate the effects of two kinds of underwear material on subjects exercising and resting in an ambient temperature of $20^{\circ}C$, a relative humidity of 60% and an air velocity of 0.13m $see^{-1}$. Two kinds of underwear ensemble were tested, differing in their hygroscopic properties: 100% wool (W) with higher moisture regain and 100% cotton (C) with lower moisture regain. Five young females served as subjects. The experiments comprised two repeated periods of 15 min exercise on a treadmill with a speed of 6km $h^{-1}$ followed by 10 min rest. The main results were as follows: 1) Mean skin temperature was significantly higher in W than in C throughout the whole experimental period (p<0.05). 2) The temperature and humidity of the microclimate between the skin and underwear provided by the first layer of clothing was higher in W than in C (p<0.1 and p<0.05, for temperature and humidity, respectively). 3) Heart rate was significantly higher in W than in C (p<0.05). 4) Subjects felt warmer during the second exercise session when wearing wool rather than cotton (p<0.05), and they also reported more increased wetness during the second exercise and rest periods in W than in C (p<0.05). These results suggest that underwear made of wool with higher moisture regain might not act as effectively as cotton to transfer exercise-induced heat from the body to the surrounding air when light exercise is taken in a thermally-neutral environment.

Keywords

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