저항성 운동이 심박 변이도에 미치는 영향

Abstract

The Acute resistance exercise has been suggested to induce abnormal cardiac autonomic function reflected by reduced heart rate variability(HRV). However, investigations have not controlled for geometrical condition, which can modulate HRV. Accordingly, the aims of this experiment were to investigate each effect of acute resistance exercises on HRV. 8 young (21.3±0.6years) healthy males performed, in random order, arm curl, bench press, and squat to volitional fatigue(within 8~12 RM) respectively. Electrocardiogram data were collected during 5 min periods in the sitting position, at rest before exercise and after exercise. Measures of heart rate variability, obtained from both time- and frequency domain analysis of 5min ECG recording were as follows: mean RR interval and its 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 each resistance exercises. In comparison of exercises, bench press resulted in significantly greater changes of HRV indices than squat, and this change are similar between squat and arm curl despite differences in force production(muscle size). These findings suggest that in resistance exercise, upper exercises results in higher change in cardiac autonomic control than lower exercises.