Relation between physical exertion and heart rate variability characteristics in professional cyclists during the Tour of Spain

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dc.contributor.author Earnest, C. P.
dc.contributor.author Jurča, Radim
dc.contributor.author Church, T. S.
dc.contributor.author López Chicharro, José
dc.contributor.author Hoyos, J.
dc.contributor.author Lucía Mulas, Alejandro
dc.date.accessioned 2016-08-23T12:43:43Z
dc.date.available 2016-08-23T12:43:43Z
dc.date.issued 2004
dc.identifier.citation Earnest, C.P., Jurca, R., Church, T.S., Chicharro, J.L., Hoyos, J., & Lucia Mulas, A. (2004). Relation between physical exertion and heart rate variability characteristics in professional cyclists during the Tour of Spain. British Journal of Sports Medicine, 38(5), 568-575. spa
dc.identifier.issn 03063674
dc.identifier.uri http://hdl.handle.net/11268/5660
dc.description.abstract Background: Continued exposure to prolonged periods of intense exercise may unfavourably alter neuroendocrine, neuromuscular, and cardiovascular function. Objective: To examine the relation between quantifiable levels of exertion (TRIMPS) and resting heart rate (HR) and resting supine heart rate variability (HRV) in professional cyclists during a three week stage race. Method: Eight professional male cyclists (mean (SEM) age 27 (1) years, body mass 65.5 (2.3) kg, and maximum rate of oxygen consumption (V̇O2MAX) 75.6 (2.2) ml/kg/min) riding in the 2001 Vuelta a España were examined for resting HR and HRV on the mornings of day 0 (baseline), day 10 (first rest day), and day 17 (second rest day). The rest days followed stages 1-9 and 10-15 respectively. HR was recorded during each race stage, and total HR time was categorised into a modified, three phase TRIMPS schema. These phases were based on standardised physiological laboratory values obtained during previous V̇O2MAX testing, where HR time in each phase (phase I = light intensity and less than ventilatory threshold (VT; ∼70% V̇O2MAX); phase II = moderate intensity between VT and respiratory compensation point (RCP; ∼90% V̇O2MAX); phase III = high intensity (>RCP)) was multiplied by exertional factors of 1, 2, and 3 respectively. Results: Multivariate analysis of variance showed that total TRIMPS for race stages 1-9 (2466 (90)) were greater than for stages 10-15 (2055 (65)) (p<0.0002). However, TRIMPS/day were less for stages 1-9 (274 (10)) than for stages 10-15(343 (11)) (p<0.01). Despite a trend to decline, no difference in supine resting HR was found between day 0 (53.2 (1.8) beats/min), day 10 (49.0 (2.8) beats/min), and day 17 (48.0 (2.6) beats/min) (p = 0.21). Whereas no significant group mean changes in HR or HRV indices were noted during the course of the race, significant inverse Pearson product-moment correlations were observed between all HRV indices relative to total TRIMPS and TRIMPS/day accumulated in race stages 10-15. Total TRIMPS correlated with square root of mean squared differences of successive RR intervals (r = -0.93; p<0.001), standard deviation of the RR intervals (r = -0.94; p<0.001), log normalised total power (r = -0.97; p<0.001), log normalised low frequency power (r = -0.79; p<0.02), and log normalised high frequency power (r = -0.94; p<0.001). Conclusion: HRV may be strongly affected by chronic exposure to heavy exertion. Training volume and intensity are necessary to delineate the degree of these alterations. spa
dc.description.sponsorship SIN FINANCIACIÓN spa
dc.language.iso eng spa
dc.title Relation between physical exertion and heart rate variability characteristics in professional cyclists during the Tour of Spain spa
dc.type article spa
dc.description.impact 1.259 JCR (2004) Q2, 19/71 Sport sciences spa
dc.identifier.doi 10.1136/bjsm.2003.005140
dc.rights.accessRights openAccess spa
dc.subject.uem Ciclismo - Entrenamiento spa
dc.subject.uem Fisiología spa
dc.subject.unesco Medicina deportiva spa
dc.subject.unesco Fisiología spa
dc.description.filiation UEM spa
dc.relation.publisherversion http://0-doi.org.busca.uem.es/10.1136/bjsm.2003.00514 0 spa
dc.peerreviewed Si spa

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