Additive effects of heating and exercise on baroreflex control of heart rate in healthy males
Peçanha T, Forjaz CLM, Low DA
Journal of applied physiology (Bethesda, Md. : 1985) · 12 citations
How it was studied
- Design
- Randomized controlled trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
- Government
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Government
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Government
- Ministério da Ciência, Tecnologia e Inovação
- Government
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Government
- São Paulo Research Foundation (FAPESP)
- Government
- Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- Government
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Coordination for the Improvement of Higher Education Personnel)
- Grants
- Fundação de Amparo à Pesquisa do Estado de São Paulo (2015/15466‐0); Fundação de Amparo à Pesquisa do Estado de São Paulo (15/13800-0)
Based on 7 listed funder(s).
Publication
- Published
- 2017-09-01 · J Appl Physiol (1985) · vol. 123 · issue 6 · pp. 1555–1562
- Publisher
- American Physiological Society
- Cited
- 15 citations · more than 78% of similar papers · 1.0× the field average
- References
- 55 works
- Access
- Open access (repository copy)
- Research areas
- Heart Rate Variability and Autonomic Control · Thermoregulation and physiological responses · Cardiovascular and exercise physiology
- Keywords
- Heart rate, Baroreflex, Heart rate variability, Cardiology, Medicine, Anesthesia, Blood pressure, Internal medicine
- MeSH
- autonomic nervous system, humans, exercise, body temperature regulation, blood pressure, heart rate, baroreflex, adult, male, hot temperature, stress, physiological, young adult
3 authors
From BR, GB
- Tiago Peçanha · correspondingUniversidade de São Paulo
- C. L. M. ForjazUniversidade de São Paulo
- David A. LowLiverpool John Moores University
Abstract
This study assessed the additive effects of passive heating and exercise on cardiac baroreflex sensitivity (cBRS) and heart rate variability (HRV). Twelve healthy young men (25 ± 1 yr, 23.8 ± 0.5 kg/m2) randomly underwent two experimental sessions: heat stress (HS; whole body heat stress using a tube-lined suit to increase core temperature by ~1°C) and normothermia (NT). Each session was composed of a preintervention rest (REST1); HS or NT interventions; postintervention rest (REST2); and 14 min of cycling exercise [7 min at 40%HRreserve (EX1) and 7 min at 60%HRreserve (EX2)]. Heart rate and finger blood pressure were continuously recorded. cBRS was assessed using the sequence (cBRSSEQ) and transfer function (cBRSTF) methods. HRV was assessed using the indexes standard deviation of RR intervals (SDNN) and root mean square of successive RR intervals (RMSSD). cBRS and HRV were not different between sessions during EX1 and EX2 (i.e., matched heart rate conditions: EX1 = 116 ± 3 vs. 114 ± 3 and EX2 = 143 ± 4 vs. 142 ± 3 beats/min but different workloads: EX1 = 50 ± 9 vs. 114 ± 8 and EX2 = 106 ± 10 vs. 165 ± 8 W; for HS and NT, respectively; P SEQ = 1.6 ± 0.3 vs. 0.6 ± 0.1 ms/mmHg, P < 0.01; SDNN = 2.3 ± 0.1 vs. 1.3 ± 0.2 ms, P < 0.01). In conclusion, in conditions matched by HR, the addition of heat stress to exercise does not affect cBRS and HRV. Alternatively, in workload-matched conditions, the addition of heat to exercise results in reduced cBRS and HRV compared with exercise in normothermia. NEW & NOTEWORTHY The present study assessed cardiac baroreflex sensitivity during the combination of heat and exercise stresses. This is the first study to show that prior whole body passive heating reduces cardiac baroreflex sensitivity and autonomic modulation of heart rate during exercise. These findings contribute to the better understanding of the role of thermoregulation on cardiovascular regulation during exercise.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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