Journal
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Volume 104, Issue 3, Pages 541-548Publisher
SPRINGER
DOI: 10.1007/s00421-008-0804-9
Keywords
endurance training; autonomic nervous system; parasympathetic nervous system; heart rate variability; time-frequency analysis
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Funding
- Ministry of Education, Finland
- TEKES-National Technology Agency of Finland
- Emil Aaltonen's Foundation, Finland
- Finnish Cultural Foundation
- Suunto Ltd., Finland
- Firstbeat Technologies Ltd., Finland
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We evaluated the effects of low-dose endurance training on autonomic HR control. We assessed the heart rate variability (HRV) of 11 untrained male subjects (36.8 +/- 7.2 years) at rest and during an incremental maximal aerobic exercise test prior to a 7-week preparatory period and prior to and following a 14-week endurance training period, including a low to high intensity exercise session twice a week. Total (0.04-1.2 Hz), low (0.04-0.15 Hz) and high (0.15-1.2 Hz) frequency power of HRV were computed by short-time Fourier transform. The preparatory period induced no change in aerobic power or HRV. The endurance training period increased peak aerobic power by 12% (P < 0.001), decreased the HR (P < 0.01) and increased all HRV indices (P < 0.05-0.01) at absolute submaximal exercise intensities, but not at rest. In conclusion, low-dose endurance training enhanced vagal control during exercise, but did not alter resting vagal HR control.
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