THE RELATION BETWEEN ENVIRONMENTAL CONDITIONS AND THE OCCURRENCE OF EXERTIONAL HEAT DISORDERS DURING PHYSICAL ACTIVITY

  • NAKAI SEIICHI
    <I>Kyoto Women's University</I> <I>Department of Physiology, Kyoto Prefectural University of Medicine</I>
  • YORIMOTO AKIRA
    <I>Shiga Prefectural Junior College</I> <I>Department of Physiology, Kyoto Prefectural University of Medicine</I>
  • MORIMOTO TAKETOSHI
    <I>Department of Physiology, Kyoto Prefectural University of Medicine</I>

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  • 環境温度と運動時熱中症事故発生との関係
  • カンキョウ オンド ト ウンドウジ ネッチュウショウ ジコ ハッセイ ト ノ

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Abstract

Deaths and morbidity due to heat disorders during physical activity were gleaned from newspaper reports between 1970 and 1990. The environmental temperatures (dry-bulb temperature and relative humidity) recorded at the closest meteorological observatory at the time of occurrence were used to calculate the wet-bulb temperature and WBGT (wet-bulb globe temperature), and the relationship between heat disorders and environmental temperature was analyzed.<BR>During the 21-year period, 108 cases of heat disorders (91 deaths and 477 casualties) were reported in newspapers. Of the 91 deaths, 9 were in females and 82 were in males, and mean ages were 23.3 years, females and 19.0 years, males.<BR>It was possible to record the environmental conditions at the time of the heat disorder in 99 cases. The results indicated that almost all disorders occurred at ranges higher than 25.5°C, dry-bulb temperature, and 20.0°C, wet-bulb temperature, 40% relative humidity, and 24.0°C, WBGT. The mean WBGT was 28°C at physiological intensities less than 12-RMR (Relative Metabolic Rate) and 25.8°C at RMR higher than 15.<BR>The seasonal distribution was from April to November. In cases observed in April, May and November, abrupt rises in WBGT in the 1.2-3.4°C range were observed on the day of occurrence in comparison with the previous day, suggesting that the degree of heat acclimatization is olso an important factor in preventing heat disorders.

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