Int J Sports Med 2010; 31(6): 428-432
DOI: 10.1055/s-0030-1249625
Training & Testing

© 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
Weitere Informationen


accepted after revision February 05, 2010

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.


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