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Post-exercise cardiac autonomic and cardiovascular responses to heart rate-matched and work rate-matched hypoxic exercise.
| Content Provider | Europe PMC |
|---|---|
| Author | Fornasiero, Alessandro Zignoli, Andrea Rakobowchuk, Mark Stella, Federico Savoldelli, Aldo Skafidas, Spyros Schena, Federico Pellegrini, Barbara Mourot, Laurent |
| Abstract | PurposeThis study investigated the effect of performing hypoxic exercise at the same heart rate (HR) or work rate (WR) as normoxic exercise on post-exercise autonomic and cardiovascular responses.MethodsThirteen men performed three interval-type exercise sessions (5 × 5-min; 1-min recovery): normoxic exercise at 80% of the WR at the first ventilatory threshold (N), hypoxic exercise (FiO2 = 14.2%) at the same WR as N (H-WR) and hypoxic exercise at the same HR as N (H-HR). Autonomic and cardiovascular assessments were conducted before and after exercise, both at rest and during active squat–stand manoeuvres (SS).ResultsCompared to N, H-WR elicited a higher HR response (≈ 83% vs ≈ 75%HRmax, p < 0.001) and H-HR a reduced exercise WR (− 21.1 ± 9.3%, p < 0.001). Cardiac parasympathetic indices were reduced 15 min after exercise and recovered within 60 min in N and H-HR, but not after H-WR (p < 0.05). H-WR altered cardiac baroreflex sensitivity (cBRS) both at rest and during SS (specifically in the control of blood pressure fall during standing phases) in the first 60 min after the exercise bout (p < 0.05). Post-exercise hypotension (PEH) did not occur in H-HR (p > 0.05) but lasted longer in H-WR than in N (p < 0.05).ConclusionsModerate HR-matched hypoxic exercise mimicked post-exercise autonomic responses of normoxic exercise without resulting in significant PEH. This may relate to the reduced WR and the limited associated mechanical/metabolic strain. Conversely, WR-matched hypoxic exercise impacted upon post-exercise autonomic and cardiovascular responses, delaying cardiac autonomic recovery, temporarily decreasing cBRS and evoking prolonged PEH.Supplementary InformationThe online version contains supplementary material available at 10.1007/s00421-021-04678-5. |
| Related Links | https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC8192382&blobtype=pdf |
| ISSN | 14396319 |
| Journal | European Journal of Applied Physiology [Eur J Appl Physiol] |
| Volume Number | 121 |
| DOI | 10.1007/s00421-021-04678-5 |
| PubMed Central reference number | PMC8192382 |
| Issue Number | 7 |
| PubMed reference number | 33811558 |
| e-ISSN | 14396327 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2021-04-03 |
| Publisher Place | Berlin/Heidelberg |
| Access Restriction | Open |
| Rights License | Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2021 |
| Subject Keyword | Hypoxic exercise Cardiac baroreflex sensitivity Heart rate variability Autonomic nervous system Post-exercise hypotension Hypoxia |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science |
