Fatigue Shifts and Scatters Heart Rate Variability in Elite Endurance Athletes
Open Access
- 12 August 2013
- journal article
- research article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 8 (8), e71588
- https://doi.org/10.1371/journal.pone.0071588
Abstract
This longitudinal study aimed at comparing heart rate variability (HRV) in elite athletes identified either in ‘fatigue’ or in ‘no-fatigue’ state in ‘real life’ conditions. 57 elite Nordic-skiers were surveyed over 4 years. R-R intervals were recorded supine (SU) and standing (ST). A fatigue state was quoted with a validated questionnaire. A multilevel linear regression model was used to analyze relationships between heart rate (HR) and HRV descriptors [total spectral power (TP), power in low (LF) and high frequency (HF) ranges expressed in ms2 and normalized units (nu)] and the status without and with fatigue. The variables not distributed normally were transformed by taking their common logarithm (log10). 172 trials were identified as in a ‘fatigue’ and 891 as in ‘no-fatigue’ state. All supine HR and HRV parameters (Beta±SE) were significantly different (PSU (+6.27±0.61 bpm), logTPSU (−0.36±0.04), logLFSU (−0.27±0.04), logHFSU (−0.46±0.05), logLF/HFSU (+0.19±0.03), HFSU(nu) (−9.55±1.33). Differences were also significant (PST (+8.83±0.89), logTPST (−0.28±0.03), logLFST (−0.29±0.03), logHFST (−0.32±0.04). Also, intra-individual variance of HRV parameters was larger (PSU: 0.26 vs. 0.07, logLFSU: 0.28 vs. 0.11, logHFSU: 0.32 vs. 0.08, logTPST: 0.13 vs. 0.07, logLFST: 0.16 vs. 0.07, logHFST: 0.25 vs. 0.14). HRV was significantly lower in 'fatigue' vs. 'no-fatigue' but accompanied with larger intra-individual variance of HRV parameters in 'fatigue'. The broader intra-individual variance of HRV parameters might encompass different changes from no-fatigue state, possibly reflecting different fatigue-induced alterations of HRV pattern.Keywords
This publication has 42 references indexed in Scilit:
- Prevention, diagnosis and treatment of the overtraining syndrome: Joint consensus statement of the European College of Sport Science (ECSS) and the American College of Sports Medicine (ACSM)European Journal of Sport Science, 2012
- Low-frequency power of heart rate variability is not a measure of cardiac sympathetic tone but may be a measure of modulation of cardiac autonomic outflows by baroreflexesExperimental Physiology, 2011
- Effects of Gender and Aging on Differential Autonomic Responses to Orthostatic ManeuversJournal of Cardiovascular Electrophysiology, 2008
- Altitude, Heart Rate Variability and Aerobic CapacitiesInternational Journal of Sports Medicine, 2007
- Heart Rate Variability, Blood Pressure Variability, and Baroreflex Sensitivity in Overtrained AthletesClinical Journal of Sport Medicine, 2006
- Hemodynamic and autonomic changes induced by Ironman: prediction of competition time by blood pressure variabilityJournal of Applied Physiology, 2005
- Endurance training, overtraining and baroreflex sensitivity in female athletesClinical Physiology and Functional Imaging, 1998
- Monitoring Training Stress in Endurance Sports Using Biological ParametersClinical Journal of Sport Medicine, 1993
- Diurnal Change in Heart Rate Variability in Healthy and Diabetic Subjects.Internal Medicine, 1992
- Stability over time of variables measuring heart rate variability in normal subjectsThe American Journal of Cardiology, 1991