Endurance exercise improves heart rate complexity in the presence of vagal withdrawal in young adults

Steven E. Perkins, Herbert F. Jelinek, Beverlie De Jong, David J. Cornforth, Mika P. Tarvainen, Hayder A. Al-Aubaidy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Sudden cardiac death (SCD) has been reported during and following physical activity. SCD may be due to vagal withdrawal and/or sympathetic dominance associated with the exercise occurring at any time during, immediately following, or up to several days after exercise. Heart rate variability (HRV) describes the influence of the autonomic nervous system on heart rate. We assessed the immediate post-exercise influence of endurance training on HRV in young adults in the morning and also on the same day in the afternoon following the morning exercise session. Linear domain parameter root mean square of successive RR interval differences (RMSSD) showed vagal withdrawal when analysed both immediately after the AM session and also when pre exercise HRV was compared to post exercise HRV during the afternoon (median average change 6.6%). However multiscale Rényi entropy indicated either no change immediately following the exercise for all scaling factors or an increase in HRV complexity of the heart rate. Despite decreased vagal influence, endurance training may be protective for some individuals that retain a higher heart rate complexity as measured by Rényi entropy in the presence of vagal withdrawal.

Original languageBritish English
Title of host publicationComputing in Cardiology Conference 2015, CinC 2015
EditorsAlan Murray
PublisherIEEE Computer Society
Number of pages4
ISBN (Electronic)9781509006854
StatePublished - 16 Feb 2015
Event42nd Computing in Cardiology Conference, CinC 2015 - Nice, France
Duration: 6 Sep 20159 Sep 2015

Publication series

NameComputing in Cardiology
ISSN (Print)2325-8861
ISSN (Electronic)2325-887X


Conference42nd Computing in Cardiology Conference, CinC 2015


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