Abstract
Cardiac parasympathetic balance is altered after resistance exercise. However, the impact of the intensity of resistance exercise in this response remains unclear. Accordingly, the aim of this study was to analyze the acute effect of resistance exercise intensity on cardiac autonomic modulation by using heart rate variability(HRV). Seven young men performed, in random order, control, 40% of RM, 60% of RM, 80% of RM in bench press to momentary muscular failure respectively. Measures of heart rate variability, obtained from both time- and frequency domain analysis of 5min ECG recording were as follows: standard deviation(SDNN), the mean square successive differences(RMSSD), the low and high frequency components which were calculated as normalized units and their ratio(LF/HF ratio). Analysis of HRV revealed a significant increase in sympathetic activity and a significant decrease in parasympathetic activity following all intensities of the resistance exercises(P0.05). In comparison of intensities, no significant differences were found in HRV indices. These findings suggest that an acute resistance exercise leading to failure induce similar cardiac parasympathetic modulation regardless of intensity.
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