High-intensity endurance training increases nocturnal heart rate variability in sedentary participants

A Nummela; E Hynynen; P Kaikkonen; H Rusko

doi:10.5604/20831862.1180171

eISSN: 2083-1862
ISSN: 0860-021X

Biology of Sport

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1/2016
vol. 33

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abstract:

Original paper

High-intensity endurance training increases nocturnal heart rate variability in sedentary participants

A Nummela

¹

,

E Hynynen

¹

,

P Kaikkonen

²

,

H Rusko

³

KIHU - Research Institute for Olympic Sports, Jyväskylä, Finland
Tampere Research Center of Sports Medicine, Tampere, Finland
University of Jyväskylä, Department of Biology of Physical Activity, Jyväskylä, Finland

Biol. Sport 2016;33:7-13

DOI: https://doi.org/10.5604/20831862.1180171

Online publish date: 2016/01/13

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The effects of endurance training on endurance performance characteristics and cardiac autonomic modulation during night sleep were investigated during two 4-week training periods. After the ﬁrst 4-week training period (3 x 40 min per week, at 75% of HRR) the subjects were divided into HIGH group (n = 7), who performed three high-intensity endurance training sessions per week; and CONTROL group (n = 8) who did not change their training. An incremental treadmill test was performed before and after the two 4-weektraining periods. Furthermore, nocturnal RR-intervals were recorded after each training day. In the second 4-weektraining period HIGH group increased their V0Zmax (P = 0.005) more than CONTROL group. At the same time, nocturnal HR decreased (P = 0.039) and high-frequency power (HFP) increased (P = 0.003) in HIGH group while no changes were observed in CONTROL group. Furthermore, a correlation was observed between the changes in nocturnal HFP and changes in V0Zmax during the second 4-week training period (r = 0.90, P < 0.001). The present study showed that the increased HFP is related to improved VO2max in sedentary subjects suggesting that nocturnal HFP can provide a useful method in monitoring individual responses to endurance training.

keywords:

High-intensity endurance training increases nocturnal heart rate variability in sedentary participants

A Nummela 1 , E Hynynen 1 , P Kaikkonen 2 , H Rusko 3

Autonomic nervous system, Distance running, Endurance performance, Heart rate variability

A Nummela

¹

,

E Hynynen

¹

,

P Kaikkonen

²

,

H Rusko

³