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Purpose: The aim of the present study was to evaluate the behavior of heart rate (HR) throughout gestation, before, during, and after the exercise in water, as well as the behavior of blood pressure (BP) before and after the same exercise. Methods: The sample was composed of seven pregnant women. The HR was measured in three moments: 1) in radial artery, in 15 seconds, with the women sitting; 2) after 20 to 30 minutes the beginning of exercise, which was performed varying from 13 to 14 based on the subject's perceived exertion (Borg's 6-20 scale), with women standing in a pool, with water at the level of their xiphoid process; 3) approximately 20 minutes after the end of the session, with women sitting. The measurement of BP was performed before and after exercise in the same conditions described above. Measurements were taken once a week throughout the gestational period. Descriptive statistics, ANOVA for repeated measures and the Bonferroni test were used, with p < 0.05 (SPSS version 11.0). Results: No statistically significant differences were found between the end of gestational trimesters and measurement conditions of variables evaluated. Conclusion: We conclude that pregnants that practice water exercises presented a constant behavior of HR and BP during the gestational period. That can probably evidence a water training effect in this population.

The aim of this study was to analyze the influence of hydrostatic weight on the changes in heart rate (HR) observed during water immersion (WI). Ten men underwent the following experimental situations: HRR-recumbent position, outside the water; HRS-standing position, outside the water; HRU-standing position, immersed up to the umbilical scar region; HRUW-standing position, immersed up to the umbilical scar region with the addition of weight to equal force weight reached in the situation standing outside the water, and HREND-standing position outside the water again. The HR was measured at the final 15 seconds of each experimental situation. ANOVA for repeated measures with posthoc Tukey tests were used. No statistically significant difference was found between HRU (60.6 ± 7.7 bpm) and HRUW (64.9 ± 7.7 bpm); however, in the comparison of these two situations with HRS (75.7±7.7 bpm), HRU presented a statistically significant difference, while HRUW did not produce a significant bradycardia. Thus, the decrease in hydrostatic weight, during WI, does not influence the behavior of HR.