The effects of resistance training with various intensity on Heart Rate Variability and muscle power

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Exerc Sci > Volume 14(4); 2005 > Article

Exercise Science 2005;14(4): 461-470.

저항성운동이 심박수변이도와 근력에 미치는 영향

강서정, 김기정

서울대학교

The effects of resistance training with various intensity on Heart Rate Variability and muscle power

ABSTRACT

Kang, S.J., Kim, K.J. The effects of resistance training with various intensity on Heart Rate Variability and muscle power. Exercise Science, 14(4): 461-470. 2005. The purpose of this study was to examine the effects of resistance training on HRV and muscle power utilizing two different training intensities. Fifteen healthy men and women (M=21±1.3) trained 3 times a week, for 8 weeks. At the beginning of the study, subjects were randomly assigned to either a low-intensity group (LG, n=8) or a high-intensity group (HG, n=7). The LG performed 3 sets of 16 repetitions at 40% of 1RM, and the HG performed 3 sets of 8 repetitions at 80% of 1RM. HRV, muscle power, and aerobic capacity (O2max) were measured and compared before and after intervention. Two-way ANOVA for repeated measures were performed on all variables (p<.05). Dependent t-test was used to compare the differences between pre and post values in 2 groups. Results showed that HRV variables within the groups were not affected by training. However, a significant difference in RR-interval within group (F= 3.587, p<.05) and between the 2 groups (F=868.693, p<.05) were found. All measurements of muscle power were significantly increased (p<.05) except right side of leg extension(kg, %). Resting heart rate (HRrest) showed no significant differences within and between the groups. O2max within the groups was significantly different (F=15.694, p<.05), and their values were enhanced in LG(t=-2.768, p=.028) and HG(t=-3.337, p=.016) after 8 weeks of resistance training. Although evidence supports beneficial muscular and cardiovascular adaptations, the results demonstrate that resistance training does not affect HRV variables except RR-interval in young, healthy subjects.

Key words: Heart Rate Variability, Resistance training, O2max.