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Cited by 167Heart Rate Variability and Autonomic ControlSports Performance and TrainingCardiovascular and exercise physiology

Heart rate variability during night sleep and after awakening in overtrained athletes

HYNYNEN, ESA, UUSITALO, ARJA, KONTTINEN, NIILO, RUSKO, HEIKKI·2006·Medicine & Science in Sports & Exercise
DOI 10.1249/01.mss.0000184631.27641.b5
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Abstract

PURPOSE: This study was conducted to test the hypothesis of autonomic imbalance in overtrained athletes during sleep and after awakening with analyses of heart rate variability (HRV) and nocturnal urine stress hormones. METHODS: We examined 12 athletes diagnosed to be severely overtrained (OA, 6 men and 6 women, mean age (+/-SD) 25 +/- 7 yr) and 12 control athletes (CA, 6 men and 6 women, mean age 24 +/- 5 yr). Overtraining diagnosis was further supported by higher perceived stress in OA than in CA (24.8 +/- 10.8 vs 15.3 +/- 5.5, P < 0.05). HRV was analyzed with time and frequency domain methods from RR intervals (RRI) recorded during sleep and after awakening. Nocturnal urine stress hormones were analyzed by liquid chromatography. RESULTS: No differences were found in HRV or stress hormones during night sleep. After awakening, the standard deviation of RRI (84 +/- 31 vs 116 +/- 41 ms, P < 0.05) and low-frequency power of RRI (2153 +/- 2232 vs 4286 +/- 2904 ms, P < 0.05) were lower in OA than in CA. From sleep to after awakening, the coefficient of variation of RRI decreased more in OA than in CA (from 11.8 +/- 3.3 to 7.7 +/- 2.5%, P < 0.001 vs from 11.9 +/- 1.8 to 10.0 +/- 2.5%, P < 0.01, respectively, interaction P < 0.05). CONCLUSION: The present findings suggest that in OA, cardiac autonomic modulation is at the level of control athletes during sleep, but the parasympathetic cardiac modulation is slightly diminished after awakening. Further investigations should concentrate on autonomic responses to different challenges, such as awakening in the present study.

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  • Inadequate recovery can reduce autonomic nervous system resources, with an associated reduction in heart rate variability and increased resting heart rate.

    “Inadequate recovery can reduce autonomic nervous system (ANS) resources, with an associated reduction in heart rate variability (HRV) and increased resting heart rate [30].”

    From Sleep and Nutrition Interactions: Implications for Athletes (2019) · cites this paper as [30]

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Authors
HYNYNEN, E., UUSITALO, A., KONTTINEN, N., & RUSKO, H.
Affiliations
  • Research Institute for Olympic Sports (FI)
  • Kuopio University Hospital (FI)
ORCID
Venue
Medicine & Science in Sports & Exercise
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2006-02
Volume
38
Issue
2
Pages
313-317
ISSN
0195-9131 (ISSN-L)
DOI
10.1249/01.mss.0000184631.27641.b5
OpenAlex
W2090523883
Cited by
167
References
28
Citations by year
2026: 8 · 2025: 6 · 2024: 6 · 2023: 2 · 2022: 17 · 2021: 15 · 2020: 9 · 2019: 8 · 2018: 14 · 2017: 7 · 2016: 7 · 2015: 5 · 2014: 12 · 2013: 14 · 2012: 9
FWCI
3.57
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
overtraining, heart rate variability, cardiac autonomic modulation, parasympathetic activity, sleep, awakening, perceived stress, athletes, RR interval
MeSH terms
Adult, Analysis of Variance, Autonomic Nervous System, Chromatography, Liquid, Epinephrine, Female, Heart Rate, Humans, Hydrocortisone, Male, Norepinephrine, Physical Education and Training, Sleep, Case-Control Studies

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