European Journal of Applied Physiology

, Volume 112, Issue 3, pp 801–809 | Cite as

Effects of exercise intensity and duration on nocturnal heart rate variability and sleep quality

  • Tero Myllymäki
  • Heikki Rusko
  • Heidi Syväoja
  • Tanja Juuti
  • Marja-Liisa Kinnunen
  • Heikki Kyröläinen
Original Article


Acute physical exercise may affect cardiac autonomic modulation hours or even days during the recovery phase. Although sleep is an essential recovery period, the information on nocturnal autonomic modulation indicated by heart rate variability (HRV) after different exercises is mostly lacking. Therefore, this study investigated the effects of exercise intensity and duration on nocturnal HR, HRV, HR, and HRV-based relaxation, as well as on actigraphic and subjective sleep quality. Fourteen healthy male subjects (age 36 ± 4 years, maximal oxygen uptake 49 ± 4 ml/kg/min) performed five different running exercises on separate occasions starting at 6 p.m. with HR guidance at home. The effect of intensity was studied with 30 min of exercises at intensities corresponding to HR level at 45% (easy), 60% (moderate) and 75% (vigorous) of their maximal oxygen uptake. The effect of duration was studied with 30, 60, and 90 min of moderate exercises. Increased exercise intensity elevated nocturnal HR compared to control day (p < 0.001), but it did not affect nocturnal HRV. Nocturnal HR was greater after the day with 90- than 30- or 60-min exercises (p < 0.01) or control day (p < 0.001). Nocturnal HRV was lower after the 90-min exercise day compared to control day (p < 0.01). Neither exercise intensity nor duration had any impact on actigraphic or subjective sleep quality. The results suggest that increased exercise intensity and/or duration cause delayed recovery of nocturnal cardiac autonomic modulation, although long exercise duration was needed to induce changes in nocturnal HRV. Increased exercise intensity or duration does not seem to disrupt sleep quality.


Exercise Recovery Heart rate variability Actigraphy Subjective sleep quality 



This work was supported by Tekes and the following companies: Nokia, Suunto, Mawell, Firstbeat Technologies, Vivago, Varma, Mehiläinen, Solaris, and JTO School of Management, and by a grant from the Finnish Cultural Foundation.

Conflict of interest

Heikki Rusko is currently a stockowner of Firstbeat Technologies Ltd., Finland.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Tero Myllymäki
    • 1
    • 2
  • Heikki Rusko
    • 1
  • Heidi Syväoja
    • 1
  • Tanja Juuti
    • 1
  • Marja-Liisa Kinnunen
    • 1
    • 2
  • Heikki Kyröläinen
    • 1
  1. 1.Department of Biology of Physical ActivityUniversity of JyväskyläJyväskyläFinland
  2. 2.Department of PsychologyUniversity of JyväskyläJyväskyläFinland

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