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1 Laboratory of Physiology, Merikoski Rehabilitation and Research Center, Oulu, Finland; Department of Medicine, University of Oulu, Oulu, Finland
2 Department of Medicine, University of Oulu, Oulu, Finland
3 Polar Electro, Kempele, Finland
* To whom correspondence should be addressed. E-mail: mikko.tulppo{at}merikoski.fi.
Individual responses to aerobic training vary from almost none to a 40% increase in aerobic fitness in sedentary subjects. The reasons for these differences in the training response are not well known. We hypothesized that the baseline cardiovascular autonomic function may influence the training response. The study population included sedentary male subjects (n=39, 35±9 yr). The training period was 8 weeks, including 6 sessions a week at an intensity of 70-80% of the maximum heart rate (HR) for 30-60 min/session. Cardiovascular autonomic function was assessed by measuring the power spectral indices of HR variability from 24-hour R-R interval recordings before the training period. Mean peak oxygen uptake (VO2peak) increased by 11±5% during the training period (range 2-19%). The training response correlated with age (r=-0.39, p=0.007) and with the values of the high-frequency spectral component of R-R intervals (HF power) analyzed over the 24-h recording (r=0.46, p=0.002) or separately during the daytime hours (r=0.35, p=0.028) and most strongly during the nigh-time hours (r=0.52, p=0.001). After adjustment for age, HF power was still associated to the training response (e.g. p=0.001 analyzed during night-time hours). These data show that cardiovascular autonomic function is an important determinant of the response to aerobic training among sedentary males. High vagal activity at baseline is associated with the improvement in aerobic power caused by aerobic exercise training in healthy sedentary subjects.
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