Endurance Exercise Improves Heart Rate Complexity in the Presence of Vagal Withdrawal in 1025 Young Adults
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Perkins, Steven. Jelinek, Herbert. de Jong, Beverlie. Cornforth, David. Tarvainen, Mika. Al-Aubaidy, Hayder. (2015). Endurance Exercise Improves Heart Rate Complexity in the Presence of Vagal Withdrawal in 1025 Young Adults. Computing in Cardiology 2015, 42, 1025-1028.Rights
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Abstract
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.