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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of postexercise cooling on heart rate recovery in normotensive and hypertensive men

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Pecanha, Tiago [1] ; Low, David [2] ; de Brito, Leandro Campos [1] ; Fecchio, Rafael Yokoyama [1] ; de Sousa, Patricia Nascimento [1] ; da Silva-Junior, Natan Daniel [1] ; de Abreu, Andrea Pio [3] ; da Silva, Giovanio Vieira [3] ; Mion-Junior, Decio [3] ; Forjaz, Claudia Lucia de Moraes [1]
Total Authors: 10
[1] Univ Sao Paulo, Exercise Hemodynam Lab, Sch Phys Educ & Sport, Ave Prof Mello Moraes 65, BR-05508030 Sao Paulo - Brazil
[2] Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool, Merseyside - England
[3] Univ Sao Paulo, Hypertens Unit, Gen Hosp, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Web of Science Citations: 0

Background Postexercise heart rate recovery (HRR) is determined by cardiac autonomic restoration after exercise and is reduced in hypertension. Postexercise cooling accelerates HRR in healthy subjects, but its effects in a population with cardiac autonomic dysfunction, such as hypertensives (HT), may be blunted. This study assessed and compared the effects of postexercise cooling on HRR and cardiac autonomic regulation in HT and normotensive (NT) subjects. Methods Twenty-three never-treated HT (43 +/- 8 years) and 25 NT (45 +/- 8 years) men randomly underwent two exercise sessions (30 min of cycling at 70% VO2peak) followed by 15 min of recovery. In one randomly allocated session, a fan was turned on in front of the subject during the recovery (cooling), while in the other session, no cooling was performed (control). HRR was assessed by heart rate reductions after 60 s (HRR60s) and 300 s (HRR300s) of recovery, short-term time constant of HRR (T30) and the time constant of the HRR after exponential fitting (HRR tau). HRV was assessed using time- and frequency-domain indices. Results HRR and HRV responses in the cooling and control sessions were similar between the HT and NT. Thus, in both groups, postexercise cooling equally accelerated HRR (HRR300s = 39 +/- 12 versus 36 +/- 10 bpm, P <= 0 center dot 05) and increased postexercise HRV (lnRMSSD = 1 center dot 8 +/- 0 center dot 7 versus 1 center dot 6 +/- 0 center dot 7 ms, P <= 0 center dot 05). Conclusion Differently from the hypothesis, postexercise cooling produced similar improvements in HRR in HT and NT men, likely by an acceleration of cardiac parasympathetic reactivation and sympathetic withdrawal. These results suggest that postexercise cooling equally accelerates HRR in hypertensive and normotensive subjects. (AU)

FAPESP's process: 15/15466-0 - Post-exercise heart rate recovery: influence of thermoregulation
Grantee:Tiago Peçanha de Oliveira
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 13/04997-0 - Heart rate recovery after exercise: regulatory mechanisms
Grantee:Cláudia Lúcia de Moraes Forjaz
Support type: Regular Research Grants
FAPESP's process: 13/05519-4 - Heart rate recovery after exercise: regulatory mechanisms in normotensives and hypertensives
Grantee:Tiago Peçanha de Oliveira
Support type: Scholarships in Brazil - Doctorate