Int J Sports Med 2010; 31(6): 428-432
DOI: 10.1055/s-0030-1249625
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© Georg Thieme Verlag KG Stuttgart · New York

Effects of Moderate and Heavy Endurance Exercise on Nocturnal HRV

E. Hynynen1 , V. Vesterinen2 , H. Rusko3 , A. Nummela4
  • 1KIHU-Research Institute for Olympic Sports, Sports Physiology, Jyväskylä, Finland
  • 2KIHU, Research Institute for Olympic Sport, Jyväskylä, Finland
  • 3University of Jyväskylä, Department of Biology of Physical Activity and Neuromuscular Research Center, Jyväskylä, Finland
  • 4Research Institute for Olympic Sports, Physiology, Jyväskylä, Finland
Further Information

Publication History

accepted after revision February 05, 2010

Publication Date:
23 April 2010 (online)


This study examined the effects of endurance exercise on nocturnal autonomic modulation. Nocturnal R-R intervals were collected after a rest day, after a moderate endurance exercise and after a marathon run in ten healthy, physically active men. Heart rate variability (HRV) was analyzed as a continuous four-hour period starting 30 min after going to bed for sleep. In relation to average nocturnal heart rate after rest day, increases to 109±6% and 130±11% of baseline were found after moderate endurance exercise and marathon, respectively. Standard deviation of R-R intervals decreased to 90±9% and 64±10%, root-mean-square of differences between adjacent R-R intervals to 87±10% and 55±16%, and high frequency power to 77±19% and 34±19% of baseline after moderate endurance exercise and marathon, respectively. Also nocturnal low frequency power decreased to 56±26% of baseline after the marathon. Changes in nocturnal heart rate and HRV suggest prolonged dose-response effects on autonomic modulation after exercises, which may give useful information on the extent of exercise-induced nocturnal autonomic modulation and disturbance to the homeostasis.



Esa Hynynen

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