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- W1997949178 abstract "The purpose of this study was to examine the influence of age and moderate-intensity exercise training on heart rate variability (HRV), and to elucidate further the mechanism of training-induced bradycardia and cardioprotection. Electrocardiograms were recorded from 12 young (18-24 yrs) and 12 mature (29-43 yrs) individuals during supine rest and submaximal moderate exercise. Recordings were obtained prior to, midway, and following 16 weeks of aerobic exercise training designed to improve cardiorespiratory fitness and health. Training resulted in augmented estimated [Formula: see text] and bradycardia during rest and submaximal exercise. Total and low frequency components of HRV during exercise were significantly increased for the mature subjects following training whereas other measures of HRV were not significantly changed for either group. It was concluded that training of moderate intensity was insufficient to induce changes in the autonomic control of heart rate for young to mature subjects. The lack of significant HRV changes may suggest the existence of a vagal critical point, below which training-induced increases in vagal modulation may be forthcoming, and above which changes in vagal modulation may be negligible. Training-induced bradycardia and the cardioprotective effect of regular aerobic exercise may result from factors other than an increased vagal modulation. Key words: physical activity, ageing, autonomic nervous system, bradycardia, spectral analysis" @default.
- W1997949178 created "2016-06-24" @default.
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- W1997949178 date "2003-06-01" @default.
- W1997949178 modified "2023-10-13" @default.
- W1997949178 title "Influence of Age and Moderate-Intensity Exercise Training on Heart Rate Variability in Young and Mature Adults" @default.
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- W1997949178 doi "https://doi.org/10.1139/h03-033" @default.
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