Abstract

GRAEF, Fabiane; TARTARUGA, Leonardo; ALBERTON, Cristine  and  KRUEL, Luiz. Heart rate frequency in immersed individuals over different water temperatures. Rev. Port. Cien. Desp. [online]. 2005, vol.5, n.3, pp.266-273. ISSN 1645-0523.

Purpose of this study was to analyze the heart rate behavior of immersed individuals in the vertical position, at a depth between the xiphoid process and the shoulders, in three water temperatures (27, 30 and 33^o C). Sample was composed of 14 male subjects aged 18 to 35, who practice water activities. Heart rate was monitored with Polar heart beat sensors, Beat model. The heart rate behavior was determined through the existing variations between the individual's heart rate in the vertical position outside the water and during immersion, at rest. The analysis of the data was conducted using descriptive statistics, variance analysis (ANOVA), with Bonferroni's post-hoc test (p £0,05). Bradycardia was observed during immersion in all three water temperatures. The average bradycardia at 33^o C was 17,85± 10,67 beat.min^-1; at 30^o C, it was 24,14 ±11,16 beat.min^-1; at 27^o C, it was 33,75 ±11,27 beat.min^-1. The differences between the averages were only statistically significant between 27^o C and 33^o C. Therefore, during water immersion in temperatures varying between 27 and 33^o C, bradycardia tends to increase with the reduction of water temperature.

Keywords : heart rate; immersion; water temperature.

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