Exercise in the water is a viable form of conditioning for those who are overweight, elderly, or affected with orthopaedic disabilities (A vellini et al., 1983). The aim of the present study was to investigate heart-rate and volume tissue responses during aerobic and hydroaerobic lasses. The experiment was carried out on ten subjects (women, age range 15-30 years). The heartrate was measured in five minute intervals, using a telemetric Polar Vantage heart-rate monitor. A portable spirometry Microlab 3000 was used to detennine the volume tissue in ten min intervals. In order to detennine any significant differences, one way ANOV A analysis of variance was used. For heart-rate responses, there was no significant difference between aerobic and hydroaerobic classes. In both cases the calculated p > 0.05 (0.4015 and 0.0884). Land heart-rate was higher and increased over time, whereas water heart-rate plateaud and even decreased slightly over time. For respiratory frequency responses there were no significant differences between classes given on land and in water, but at 15 and 20 minutes during the exercises a significant difference on the respiratory frequency was found; p < 0.05 (0.00039), hydroaerobic class having higher values.
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