CHANGES OF BODY TEMPERATURE AT REST AND DURING EXERCISE IN WATER / 体力科学

ABSTRACT

The metabolic rate, HR and thermal responses of 26 children, aged 7-8 years (6 boys, 7 girls) and aged 9-11 years (7 boys, 6 girls), were measured during head-out immersion in water. In the water bath, a bicycle ergometer was set and water temperature wes maintained at 26±1°C. Thirty minutes measurements of heat production (cal⋅min<SUP>-1</SUP>⋅m<SUP>-2</SUP>), HR, rectal (T<SUB>re</SUB>) and skin (T<SUB>sk</SUB>) temperatures were obtained under experimental conditions of resting and bicycling in water.<BR>The rate of decrease in HR and T<SUB>re</SUB> were significantly greater in the younger group than the older, irrespective of sex, in resting condition (P<0.001, P<0.01, respectively), but any differences could not be found in bicycling condition.<BR>Heat conductanc (K) from body surface were calculated. In resting condition in water, older girl group showed K=94.1 (cal⋅m<SUP>2</SUP>⋅°C ⋅min<SUP>-1</SUP>) and younger boy group K=142.2 and in bicycling condition in water they were 213.8 and 276.9, respectively.