Influence of intensive cycling training on heart rate variability during rest and exercise

Article


Leicht, Anthony S., Allen, Graham D. and Hoey, Andrew. 2003. "Influence of intensive cycling training on heart rate variability during rest and exercise." Canadian Journal of Applied Physiology. 28 (6), pp. 898-909.
Article Title

Influence of intensive cycling training on heart rate variability during rest and exercise

Article CategoryArticle
AuthorsLeicht, Anthony S. (Author), Allen, Graham D. (Author) and Hoey, Andrew (Author)
Journal TitleCanadian Journal of Applied Physiology
Journal Citation28 (6), pp. 898-909
Number of Pages12
Year2003
Place of PublicationUnited States
Web Address (URL)http://hk.humankinetics.com/CJAP/journalAbout.cfm
Abstract

[Abstract]: The current study examined whether changes in heart rate variability (HRV) following intensive cycling training contribute to the mechanism of training-induced bradycardia. Thirteen healthy untrained subjects, ages 18–27 years, underwent recordings of heart rate (HR) and VO2max before and after 8 weeks of cycling, 25–60 min/day, 5 days/week at >80% maximum HR (HRmax). Heart rate recordings were obtained during supine rest and
submaximal exercise and were analysed for the following components of HRV: low frequency (LF, 0.041–0.15 Hz); high frequency (HF, 0.15–0.40 Hz); LF/HF ratio and total
power (TP, 0–0.40 Hz). At posttraining, VO2max was significantly increased while HR was significantly reduced at rest and all absolute exercise work rates. Training-induced lower HR was accompanied by significantly greater HF and TP during rest as well as LF, HF, and TP during all absolute exercise work rates. Posttraining HR and the majority of HRV measures were similar to pretraining values at the same relative exercise intensity (% HRmax).
These results indicated that 8 weeks of intensive cycling training increased HRV and cardiac vagal modulation during rest and absolute exercise work rates but had little effect
during relative exercise work rates. Increased vagal modulation resulting from intensive exercise training may contribute to the mechanism of training-induced bradycardia.

Keywordsexercise training, autonomic nervous system, bradycardia, vagal modulation
ANZSRC Field of Research 2020310999. Zoology not elsewhere classified
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Byline AffiliationsJames Cook University
University of Southern Queensland
Centre for Biomedical Research
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