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The Development of Functional Overreaching Is Associated with a Faster Heart Rate Recovery in Endurance Athletes

Aubry, A and Hausswirth, C and Louis, J and Coutts, AJ and Buchheit, M and Le Meur, Y (2015) The Development of Functional Overreaching Is Associated with a Faster Heart Rate Recovery in Endurance Athletes. PLOS ONE, 10 (10). pp. 1-16. ISSN 1932-6203

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Abstract

Purpose
The aim of the study was to investigate whether heart rate recovery (HRR) may represent an effective marker of functional overreaching (f-OR) in endurance athletes.
Methods and Results
Thirty-one experienced male triathletes were tested (10 control and 21 overload subjects) before (Pre), and immediately after an overload training period (Mid) and after a 2-week taper (Post). Physiological responses were assessed during an incremental cycling protocol to exhaustion, including heart rate, catecholamine release and blood lactate concentration. Ten participants from the overload group developed signs of f-OR at Mid (i.e. -2.1 ± 0.8% change in performance associated with concomitant high perceived fatigue). Additionally, only the f-OR group demonstrated a 99% chance of increase in HRR during the overload period (+8 ± 5 bpm, large effect size). Concomitantly, this group also revealed a >80% chance of decreasing blood lactate (-11 ± 14%, large), plasma norepinephrine (-12 ± 37%, small) and plasma epinephrine peak concentrations (-51 ± 22%, moderate). These blood measures returned to baseline levels at Post. HRR change was negatively correlated to changes in performance, peak HR and peak blood metabolites concentrations.
Conclusion
These findings suggest that i) a faster HRR is not systematically associated with improved physical performance, ii) changes in HRR should be interpreted in the context of the specific training phase, the athletes perceived level of fatigue and the performance response; and, iii) the faster HRR associated with f-OR may be induced by a decreased central commandand by a lower chemoreflex activity.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: PUBLIC LIBRARY SCIENCE
Related URLs:
Date Deposited: 25 Nov 2015 10:14
Last Modified: 25 Nov 2015 10:14
DOI or Identification number: 10.1371/journal.pone.0139754
URI: http://researchonline.ljmu.ac.uk/id/eprint/2391

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