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1 Merikoski Rehabilitation and Research Center, Oulu, Finland; Department of Medicine, Division of Cardiology, University of Oulu, Oulu, Finland
2 Polar Electro, Kempele, Finland
3 Department of Kinesiology, University of Waterloo, Waterloo, Canada
4 Department of Medicine, Division of Cardiology, University of Oulu, Oulu, Finland
* To whom correspondence should be addressed. E-mail: mikko.tulppo{at}merikoski.fi.
This study was designed to assess the effects of moderate and high volume aerobic training on the time domain, spectral and fractal heart rate (HR) variability indices. Sedentary subjects were randomized into groups with moderate volume training (n=20) and high volume training (n=20) and controls (n=15). The training period was 8 weeks, including 6 sessions a week at an intensity of 70-80 % of the maximum HR, lasting for 30 min/session in the moderate and 60 min/session in the high volume groups. Time domain, frequency domain and short-term fractal scaling measures of HR variability were analyzed over a 24-hour period. The mean HR decreased from 70±7 to 64±8 bpm and from 67±5 to 60±6 bpm (P<0.001 for both) for the moderate and high volume training groups, respectively. The normalized high frequency (HFnu) spectral component increased in both groups (P<0.05). Normalized low frequency (LF) component decreased significantly (P<0.05) resulting in a marked decrease in LF/HF ratio in both groups. In addition short-term scaling exponent decreased in both groups (P<0.001). There were no significant differences in the changes of HR variability indices between the groups. Aerobic training in sedentary subjects results in altered autonomic regulation of HR toward vagal dominance. A moderate training volume is a sufficient intervention to induce these beneficial effects.
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