Influence of passive muscle tension on electromechanical delay in humans.

<h4>Background</h4>Electromechanical delay is the time lag between onsets of muscle activation and muscle force production and reflects both electro-chemical processes and mechanical processes. The aims of the present study were two-fold: to experimentally determine the slack length of e...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Lilian Lacourpaille, François Hug, Antoine Nordez
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e3f8c49547124dd4a02746f7e2141309
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:e3f8c49547124dd4a02746f7e2141309
record_format	dspace
spelling	oai:doaj.org-article:e3f8c49547124dd4a02746f7e21413092021-11-18T08:02:40ZInfluence of passive muscle tension on electromechanical delay in humans.1932-620310.1371/journal.pone.0053159https://doaj.org/article/e3f8c49547124dd4a02746f7e21413092013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23308153/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Electromechanical delay is the time lag between onsets of muscle activation and muscle force production and reflects both electro-chemical processes and mechanical processes. The aims of the present study were two-fold: to experimentally determine the slack length of each head of the biceps brachii using elastography and to determine the influence of the length of biceps brachii on electromechanical delay and its electro-chemical/mechanical processes using very high frame rate ultrasound.<h4>Methods/results</h4>First, 12 participants performed two passive stretches to evaluate the change in passive tension for each head of the biceps brachii. Then, they underwent two electrically evoked contractions from 120 to 20° of elbow flexion (0°: full extension), with the echographic probe maintained over the muscle belly and the myotendinous junction of biceps brachii. The slack length was found to occur at 95.5 ± 6.3° and 95.3 ± 8.2° of the elbow joint angle for the long and short heads of the biceps brachii, respectively. The electromechanical delay was significantly longer at 120° (16.9 ± 3.1 ms; p<0.001), 110° (15.0 ± 3.1 ms; p<0.001) and 100° (12.7 ± 2.5 ms; p = 0.01) of elbow joint angle compared to 90° (11.1 ± 1.7 ms). However, the delay between the onset of electrical stimulation and the onset of both muscle fascicles (3.9 ± 0.2 ms) and myotendinous junction (3.7 ± 0.3 ms) motion was not significantly affected by the joint angle (p>0.95).<h4>Conclusion</h4>In contrast to previous observations on gastrocnemius medialis, the onset of muscle motion and the onset of myotendinous junction motion occurred simultaneously regardless of the length of the biceps brachii. That suggests that the between-muscles differences reported in the literature cannot be explained by different muscle passive tension but instead may be attributable to muscle architectural differences.Lilian LacourpailleFrançois HugAntoine NordezPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 1, p e53159 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lilian Lacourpaille François Hug Antoine Nordez Influence of passive muscle tension on electromechanical delay in humans.
description	<h4>Background</h4>Electromechanical delay is the time lag between onsets of muscle activation and muscle force production and reflects both electro-chemical processes and mechanical processes. The aims of the present study were two-fold: to experimentally determine the slack length of each head of the biceps brachii using elastography and to determine the influence of the length of biceps brachii on electromechanical delay and its electro-chemical/mechanical processes using very high frame rate ultrasound.<h4>Methods/results</h4>First, 12 participants performed two passive stretches to evaluate the change in passive tension for each head of the biceps brachii. Then, they underwent two electrically evoked contractions from 120 to 20° of elbow flexion (0°: full extension), with the echographic probe maintained over the muscle belly and the myotendinous junction of biceps brachii. The slack length was found to occur at 95.5 ± 6.3° and 95.3 ± 8.2° of the elbow joint angle for the long and short heads of the biceps brachii, respectively. The electromechanical delay was significantly longer at 120° (16.9 ± 3.1 ms; p<0.001), 110° (15.0 ± 3.1 ms; p<0.001) and 100° (12.7 ± 2.5 ms; p = 0.01) of elbow joint angle compared to 90° (11.1 ± 1.7 ms). However, the delay between the onset of electrical stimulation and the onset of both muscle fascicles (3.9 ± 0.2 ms) and myotendinous junction (3.7 ± 0.3 ms) motion was not significantly affected by the joint angle (p>0.95).<h4>Conclusion</h4>In contrast to previous observations on gastrocnemius medialis, the onset of muscle motion and the onset of myotendinous junction motion occurred simultaneously regardless of the length of the biceps brachii. That suggests that the between-muscles differences reported in the literature cannot be explained by different muscle passive tension but instead may be attributable to muscle architectural differences.
format	article
author	Lilian Lacourpaille François Hug Antoine Nordez
author_facet	Lilian Lacourpaille François Hug Antoine Nordez
author_sort	Lilian Lacourpaille
title	Influence of passive muscle tension on electromechanical delay in humans.
title_short	Influence of passive muscle tension on electromechanical delay in humans.
title_full	Influence of passive muscle tension on electromechanical delay in humans.
title_fullStr	Influence of passive muscle tension on electromechanical delay in humans.
title_full_unstemmed	Influence of passive muscle tension on electromechanical delay in humans.
title_sort	influence of passive muscle tension on electromechanical delay in humans.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/e3f8c49547124dd4a02746f7e2141309
work_keys_str_mv	AT lilianlacourpaille influenceofpassivemuscletensiononelectromechanicaldelayinhumans AT francoishug influenceofpassivemuscletensiononelectromechanicaldelayinhumans AT antoinenordez influenceofpassivemuscletensiononelectromechanicaldelayinhumans
_version_	1718422637975175168

Influence of passive muscle tension on electromechanical delay in humans.

Ejemplares similares