Effects of Extreme Endurance Running on Cardiac Autonomic Nervous Modulation in Healthy Trained Subjects

This study examined spectral components of heart rate variability (HRV) during endurance mountain running in 8 healthy trained subjects. The data showed that during this type of mountain running, all spectral components of HRV may severely decrease, particularly very-low-frequency and low-frequency...

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Bibliographic Details
Published in:The American journal of cardiology 2006-01, Vol.97 (2), p.276-278
Main Authors: Sztajzel, Juan, Atchou, Guillaume, Adamec, Richard, Bayes de Luna, Antonio
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Cardiology
Cardiology. Vascular system
Down-Regulation - physiology
Female
Heart
Heart - innervation
Heart Rate - physiology
Humans
Male
Medical sciences
Physical Endurance - physiology
Receptors, Adrenergic, beta - physiology
Running
Running - physiology
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Summary:This study examined spectral components of heart rate variability (HRV) during endurance mountain running in 8 healthy trained subjects. The data showed that during this type of mountain running, all spectral components of HRV may severely decrease, particularly very-low-frequency and low-frequency (LF) power, suggesting extreme activation of the sympathetic nervous system. The physiologic response of the heart in this situation was the downregulation of the β-adrenergic receptors to protect myocardial function, with a subsequent increase in parasympathetic tone, reflected by an increase in high-frequency (HF) power and a decrease in the LF/HF ratio.
ISSN:0002-9149
1879-1913
DOI:10.1016/j.amjcard.2005.08.040