THERMOREGULATION DURING EXERCISE IN HIGH HUMIDITY ENVIRONMENTS / 体力科学

ABSTRACT

Thermoregulatory responses during one hour pedalling on bicycle ergometer were measured in a climatic chamber of 26°C at various humidity levels. Work intensities were 30, 40, 50, 60 and 70% of Vo<SUB>2</SUB>max. Relative humidities were 30, 60 and 90%.<BR>1) Oxygen intake remained nearly constant at the same work load and was not influenced by humidity level.<BR>2) At work intensities of more than 60% of Vo<SUB>2</SUB>max the elevation of rectal temperature was augmented by increased humidity.<BR>3) The secretion of sweat increased, but the evaporation of sweat decreased with increased humidity, particularly at work intensities of 60% and 70% of Vo<SUB>2</SUB>max.