Activation of Mechanoreflex, but not Central Command, Delays Heart Rate Recovery after Exercise in Healthy Men

Autor(es):Mostrar menos -

Pecanha, Tiago ^[1] ; de Brito, Leandro Campos ^[1] ; Fecchio, Rafael Yokoyama ^[1] ; de Sousa, Patricia Nascimento ^[1] ; Silva, Natan Daniel ^[1] ; Couto, Patricia Guimaraes ^[2] ; de Abreu, Andrea Pio ^[3] ; da Silva, Giovanio Vieira ^[3] ; Mion, Decio ^[3] ; Low, David A. ^[4] ; de Moraes Forjaz, Claudia Lucia ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Exercise Hemodynam Lab, Sch Phys Educ & Sport, Av Prof Melo Moraes 65, BR-05508030 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Fac Med, Hipertens Unit, Gen Hosp, Sao Paulo - Brazil

^[4] Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool, Merseyside - England

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF SPORTS MEDICINE; v. 42, n. 07, p. 602-609, JUN 2021.
• Citações Web of Science: 1

Resumo

This study tested the hypotheses that activation of central command and muscle mechanoreflex during post-exercise recovery delays fast-phase heart rate recovery with little influence on the 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 (HRR (30s) , HRR (60s) fast phase) and from 60s-to-300s of recovery (HRR (60-300s) 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 phase (HRR (60s) =20 +/- 8vs.27 +/- 10bpm, p<0.01), but not in the slow phase (HRR (60-300s) =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. (AU)

• Processo FAPESP: 13/04997-0 - Recuperação da frequência cardíaca pós-exercício: mecanismos reguladores
• Beneficiário: Cláudia Lúcia de Moraes Forjaz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/05519-4 - Recuperação da frequência cardíaca pós-exercício: mecanismos reguladores em normotensos e hipertensos
• Beneficiário: Tiago Peçanha de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado