Abstract
Oxygen consumption (VO2), 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 (VO2max) 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.
