Cardio-Respiratory Response during Under Water Exercise at Three Different Water Temperatures

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Oxygen consumption (VO<SUB>2</SUB>), heart rates (HR), ventilation (VE) blood lactate (LA) and rectal temperature (Tr) were measured at three different water temperatures (18.0, 22.0, and 26.0°C) using under water bicycle ergometer. Subjects consisted three girls and six boys aged 10-12 years. t02 was lineary related to the work loads in 18.0°C than 22.0 and 26.0°C. HR were lower at 18.00C compared to 22.0 and 26.0°C at lower work loads. However there was no significant difference among three different water temperatures. Maximal oxygen uptake (VO<SUB>2</SUB>max) did not differ at any water temperatures. Higher tE at 18.00C than 22.0 and 26.0°C. There was no significant difference between 18.0 and 22.00C. Blood lactate concentration after maximal exercise was 6.61mmol/1 in 18.0°C, 6.10mmol/l in 22.0°C and 5.36mmol/l in 26.0°C. In 18.0°C of water five subjects drop core temperature (0.2-0.6°C) during 10-16 minutes of exercise.
日本生理人類学会の論文