Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue

Abstract Muscle fatigue is a complex phenomenon enclosing various mechanisms. Despite technological advances, these mechanisms are still not fully understood in vivo. Here, simultaneous measurements of pressure, volume, and ribcage inspiratory muscle activity were performed non-invasively during fat...

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Autores principales:	Antonio Sarmento, Guilherme Fregonezi, Maria Lira, Layana Marques, Francesca Pennati, Vanessa Resqueti, Andrea Aliverti
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d7cd04f303c34584855b6272885f0f86
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spelling	oai:doaj.org-article:d7cd04f303c34584855b6272885f0f862021-12-02T17:41:33ZChanges in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue10.1038/s41598-021-92060-y2045-2322https://doaj.org/article/d7cd04f303c34584855b6272885f0f862021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92060-yhttps://doaj.org/toc/2045-2322Abstract Muscle fatigue is a complex phenomenon enclosing various mechanisms. Despite technological advances, these mechanisms are still not fully understood in vivo. Here, simultaneous measurements of pressure, volume, and ribcage inspiratory muscle activity were performed non-invasively during fatigue (inspiratory threshold valve set at 70% of maximal inspiratory pressure) and recovery to verify if inspiratory ribcage muscle fatigue (1) leads to slowing of contraction and relaxation properties of ribcage muscles and (2) alters median frequency and high-to-low frequency ratio (H/L). During the fatigue protocol, sternocleidomastoid showed the fastest decrease in median frequency and slowest decrease in H/L. Fatigue was also characterized by a reduction in the relative power of the high-frequency and increase of the low-frequency. During recovery, changes in mechanical power were due to changes in shortening velocity with long-lasting reduction in pressure generation, and slowing of relaxation [i.e., tau (τ), half-relaxation time (½RT), and maximum relaxation rate (MRR)] was observed with no significant changes in contractile properties. Recovery of median frequency was faster than H/L, and relaxation rates correlated with shortening velocity and mechanical power of inspiratory ribcage muscles; however, with different time courses. Time constant of the inspiratory ribcage muscles during fatigue and recovery is not uniform (i.e., different inspiratory muscles may have different underlying mechanisms of fatigue), and MRR, ½RT, and τ are not only useful predictors of inspiratory ribcage muscle recovery but may also share common underlying mechanisms with shortening velocity.Antonio SarmentoGuilherme FregoneziMaria LiraLayana MarquesFrancesca PennatiVanessa ResquetiAndrea AlivertiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Antonio Sarmento Guilherme Fregonezi Maria Lira Layana Marques Francesca Pennati Vanessa Resqueti Andrea Aliverti Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
description	Abstract Muscle fatigue is a complex phenomenon enclosing various mechanisms. Despite technological advances, these mechanisms are still not fully understood in vivo. Here, simultaneous measurements of pressure, volume, and ribcage inspiratory muscle activity were performed non-invasively during fatigue (inspiratory threshold valve set at 70% of maximal inspiratory pressure) and recovery to verify if inspiratory ribcage muscle fatigue (1) leads to slowing of contraction and relaxation properties of ribcage muscles and (2) alters median frequency and high-to-low frequency ratio (H/L). During the fatigue protocol, sternocleidomastoid showed the fastest decrease in median frequency and slowest decrease in H/L. Fatigue was also characterized by a reduction in the relative power of the high-frequency and increase of the low-frequency. During recovery, changes in mechanical power were due to changes in shortening velocity with long-lasting reduction in pressure generation, and slowing of relaxation [i.e., tau (τ), half-relaxation time (½RT), and maximum relaxation rate (MRR)] was observed with no significant changes in contractile properties. Recovery of median frequency was faster than H/L, and relaxation rates correlated with shortening velocity and mechanical power of inspiratory ribcage muscles; however, with different time courses. Time constant of the inspiratory ribcage muscles during fatigue and recovery is not uniform (i.e., different inspiratory muscles may have different underlying mechanisms of fatigue), and MRR, ½RT, and τ are not only useful predictors of inspiratory ribcage muscle recovery but may also share common underlying mechanisms with shortening velocity.
format	article
author	Antonio Sarmento Guilherme Fregonezi Maria Lira Layana Marques Francesca Pennati Vanessa Resqueti Andrea Aliverti
author_facet	Antonio Sarmento Guilherme Fregonezi Maria Lira Layana Marques Francesca Pennati Vanessa Resqueti Andrea Aliverti
author_sort	Antonio Sarmento
title	Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
title_short	Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
title_full	Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
title_fullStr	Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
title_full_unstemmed	Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
title_sort	changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d7cd04f303c34584855b6272885f0f86
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Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue

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