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Activation of mechanoreflex delays heart rate recovery after exercise in healthy men

Low, DA, Pecanha, T, Forjaz, C, de Brito, L, Fecchio, R, Couto, P, de Sousa, P, da Silva-Júnior, N, de Abreu, A, da Silva, G and Mion-Junior, D Activation of mechanoreflex delays heart rate recovery after exercise in healthy men. International Journal of Sports Medicine. ISSN 0172-4622 (Accepted)

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Abstract

This study tested the hypotheses that activation of central command and muscle mechanoreflex during post-exercise recovery delay fast-phase heart rate recovery with little influence on slow-phase. Twenty- five healthy men underwent three submaximal cycling bouts, each followed by a different 5-min recovery protocol: active (cycling generated by the own subject), passive (cycling generated by external force) and inactive (no-cycling). Heart rate recovery was assessed by the heart rate decay from peak exercise to 30s and 60s of recovery (HRR30s, HRR60s -fast-phase) and from 60s-to-300s of recovery (HRR60-300s -slow-phase). The effect of central command was examined by comparing active and passive recoveries (with and without central command activation) and the effect of mechanoreflex was assessed by comparing passive and inactive recoveries (with and without mechanoreflex activation). Heart rate recovery was similar between active and passive recoveries, regardless of the phase. Heart rate recovery was slower in the passive than inactive recovery in the fast- (HRR60s=20±8vs.27±10bpm, p<0.01), but not in the slow-phase (HRR60-300s=13±8vs.10±8bpm, p=0.11). In conclusion, activation of mechanoreflex, but not central command, during recovery delays fast phase heart rate recovery. These results elucidate important neural mechanisms behind heart rate recovery regulation.

Item Type: Article
Uncontrolled Keywords: 0913 Mechanical Engineering, 1106 Human Movement and Sports Sciences
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Thieme Gruppe
Date Deposited: 15 Dec 2020 09:58
Last Modified: 15 Dec 2020 10:01
URI: https://researchonline.ljmu.ac.uk/id/eprint/13841

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