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Muscular contraction mode differently affects autonomic control during heart rate matched exercise
The precise contributions of afferent feedback to cardiovascular and respiratory responses to exercise are still unclear. The aim of this crossover study was to assess whether and how autonomic cardiovascular and respiratory control differed in response to dynamic (DYN) and isometric contractions (I...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4436571/ https://www.ncbi.nlm.nih.gov/pubmed/26042047 http://dx.doi.org/10.3389/fphys.2015.00156 |
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author | Weippert, Matthias Behrens, Martin Gonschorek, Ray Bruhn, Sven Behrens, Kristin |
author_facet | Weippert, Matthias Behrens, Martin Gonschorek, Ray Bruhn, Sven Behrens, Kristin |
author_sort | Weippert, Matthias |
collection | PubMed |
description | The precise contributions of afferent feedback to cardiovascular and respiratory responses to exercise are still unclear. The aim of this crossover study was to assess whether and how autonomic cardiovascular and respiratory control differed in response to dynamic (DYN) and isometric contractions (ISO) at a similar, low heart rate (HR) level. Therefore, 22 healthy males (26.7 ± 3.6 yrs) performed two kinds of voluntary exercises at similar HR: ISO and DYN of the right quadriceps femoris muscle. Although HR was eqivalent (82 ± 8 bpm for DYN and ISO, respectively), rating of exertion, blood pressures, and rate pressure product were higher, whereas breathing frequency, minute ventilation, oxygen uptake and carbon dioxide output were significantly lower during ISO. Tidal volume, end-tidal partial pressures of O(2) and CO(2), respiratory exchange ratio and capillary blood lactate concentration were comparable between both contraction modes. Heart rate variability (HRV) indicators, SDNN, HF-Power and LF-Power, representing both vagal and sympathetic influences, were significantly higher during ISO. Sample entropy, a non-linear measure of HRV was also significantly affected by contraction mode. It can be concluded that, despite the same net effect on HR, the quality of cardiovascular control during low intensity exercise is significantly different between DYN and ISO. HRV analysis indicated a sympatho-vagal coactivation during ISO. Whether mechanoreceptor feedback alone, a change in central command, or the interaction of both mechanisms is the main contributor of the distinct autonomic responses to the different exercise modes remains to be elucidated. |
format | Online Article Text |
id | pubmed-4436571 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-44365712015-06-03 Muscular contraction mode differently affects autonomic control during heart rate matched exercise Weippert, Matthias Behrens, Martin Gonschorek, Ray Bruhn, Sven Behrens, Kristin Front Physiol Physiology The precise contributions of afferent feedback to cardiovascular and respiratory responses to exercise are still unclear. The aim of this crossover study was to assess whether and how autonomic cardiovascular and respiratory control differed in response to dynamic (DYN) and isometric contractions (ISO) at a similar, low heart rate (HR) level. Therefore, 22 healthy males (26.7 ± 3.6 yrs) performed two kinds of voluntary exercises at similar HR: ISO and DYN of the right quadriceps femoris muscle. Although HR was eqivalent (82 ± 8 bpm for DYN and ISO, respectively), rating of exertion, blood pressures, and rate pressure product were higher, whereas breathing frequency, minute ventilation, oxygen uptake and carbon dioxide output were significantly lower during ISO. Tidal volume, end-tidal partial pressures of O(2) and CO(2), respiratory exchange ratio and capillary blood lactate concentration were comparable between both contraction modes. Heart rate variability (HRV) indicators, SDNN, HF-Power and LF-Power, representing both vagal and sympathetic influences, were significantly higher during ISO. Sample entropy, a non-linear measure of HRV was also significantly affected by contraction mode. It can be concluded that, despite the same net effect on HR, the quality of cardiovascular control during low intensity exercise is significantly different between DYN and ISO. HRV analysis indicated a sympatho-vagal coactivation during ISO. Whether mechanoreceptor feedback alone, a change in central command, or the interaction of both mechanisms is the main contributor of the distinct autonomic responses to the different exercise modes remains to be elucidated. Frontiers Media S.A. 2015-05-19 /pmc/articles/PMC4436571/ /pubmed/26042047 http://dx.doi.org/10.3389/fphys.2015.00156 Text en Copyright © 2015 Weippert, Behrens, Gonschorek, Bruhn and Behrens. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Physiology Weippert, Matthias Behrens, Martin Gonschorek, Ray Bruhn, Sven Behrens, Kristin Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title | Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title_full | Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title_fullStr | Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title_full_unstemmed | Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title_short | Muscular contraction mode differently affects autonomic control during heart rate matched exercise |
title_sort | muscular contraction mode differently affects autonomic control during heart rate matched exercise |
topic | Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4436571/ https://www.ncbi.nlm.nih.gov/pubmed/26042047 http://dx.doi.org/10.3389/fphys.2015.00156 |
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