Little Effect of Endurance Training on Heart Rate and Heart Rate Variability at Sitting Rest

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We investigated whether or not an endurance training regimen affects the adaptations of the autonomic nervous system at sitting rest. Forty-two subjects were assigned to high-intensity training (n=7, HL group), middle-intensity training (n=7, ML group), low-intensity training (n=8, LL group), middle-intensity and short-duration training (n=8, MS group), control 1 (n=6, C1 group) and control 2 (n=6, C2 group) groups. Each training group trained for 8 weeks, 3 times/week, using a cycle ergometer. The duration of each training session was 60 min for HL, ML and LL, and 20 min for the MS group. The target heart rate at training was 150 bpm in HL, 125 bpm in ML and MS, and 100 bpm in LL. Vo_2max was measured before and after the 8 week training program. Sitting R-R intervals were measured every 2 weeks. Spectral analysis (FFT) was applied to R-R intervals, and areas of 0.05-0.15 Hz (Pl) and 0.15-1.0 Hz (Ph) were calculated to evaluate sympathetic nervous (Pl/Ph) and vagal (Ph) activities. Vo_2max significantly increased in the HL, ML and MS groups. HR, Pl/Ph and Ph were not significantly different from the pre-training values in any group. These findings suggest that 8 wk of endurance training regimens do not affect the autonomic nervous system and that 8 wk of endurance training does not necessarily change autonomic nervous activities at sitting rest.
日本運動生理学会の論文