Cargando…

Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles

The term “task failure” describes the point when a person is not able to maintain the level of force required by a task. As task failure approaches, the corticospinal command to the muscles increases to maintain the required level of force in the face of a decreased mechanical efficacy. Nevertheless...

Descripción completa

Detalles Bibliográficos
Autores principales: Castronovo, Anna Margherita, De Marchis, Cristiano, Schmid, Maurizio, Conforto, Silvia, Severini, Giacomo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6008706/
https://www.ncbi.nlm.nih.gov/pubmed/29967654
http://dx.doi.org/10.1155/2018/4759232
_version_ 1783333234380111872
author Castronovo, Anna Margherita
De Marchis, Cristiano
Schmid, Maurizio
Conforto, Silvia
Severini, Giacomo
author_facet Castronovo, Anna Margherita
De Marchis, Cristiano
Schmid, Maurizio
Conforto, Silvia
Severini, Giacomo
author_sort Castronovo, Anna Margherita
collection PubMed
description The term “task failure” describes the point when a person is not able to maintain the level of force required by a task. As task failure approaches, the corticospinal command to the muscles increases to maintain the required level of force in the face of a decreased mechanical efficacy. Nevertheless, most motor tasks require the synergistic recruitment of several muscles. How this recruitment is affected by approaching task failure is still not clear. The increase in the corticospinal drive could be due to an increase in synergistic recruitment or to overlapping commands sent to the muscles individually. Herein, we investigated these possibilities by combining intermuscular coherence and synergy analysis on signals recorded from three muscles of the quadriceps during dynamic leg extension tasks. We employed muscle synergy analysis to investigate changes in the coactivation of the muscles. Three different measures of coherence were used. Pooled coherence was used to estimate the command synchronous to all three muscles, pairwise coherence the command shared across muscle pairs and residual coherence the command peculiar to each couple of muscles. Our analysis highlights an overall decrease in synergistic command at task failure and an intensification of the contribution of the nonsynergistic shared command.
format Online
Article
Text
id pubmed-6008706
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher Hindawi
record_format MEDLINE/PubMed
spelling pubmed-60087062018-07-02 Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles Castronovo, Anna Margherita De Marchis, Cristiano Schmid, Maurizio Conforto, Silvia Severini, Giacomo Appl Bionics Biomech Research Article The term “task failure” describes the point when a person is not able to maintain the level of force required by a task. As task failure approaches, the corticospinal command to the muscles increases to maintain the required level of force in the face of a decreased mechanical efficacy. Nevertheless, most motor tasks require the synergistic recruitment of several muscles. How this recruitment is affected by approaching task failure is still not clear. The increase in the corticospinal drive could be due to an increase in synergistic recruitment or to overlapping commands sent to the muscles individually. Herein, we investigated these possibilities by combining intermuscular coherence and synergy analysis on signals recorded from three muscles of the quadriceps during dynamic leg extension tasks. We employed muscle synergy analysis to investigate changes in the coactivation of the muscles. Three different measures of coherence were used. Pooled coherence was used to estimate the command synchronous to all three muscles, pairwise coherence the command shared across muscle pairs and residual coherence the command peculiar to each couple of muscles. Our analysis highlights an overall decrease in synergistic command at task failure and an intensification of the contribution of the nonsynergistic shared command. Hindawi 2018-06-03 /pmc/articles/PMC6008706/ /pubmed/29967654 http://dx.doi.org/10.1155/2018/4759232 Text en Copyright © 2018 Anna Margherita Castronovo et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Castronovo, Anna Margherita
De Marchis, Cristiano
Schmid, Maurizio
Conforto, Silvia
Severini, Giacomo
Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title_full Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title_fullStr Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title_full_unstemmed Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title_short Effect of Task Failure on Intermuscular Coherence Measures in Synergistic Muscles
title_sort effect of task failure on intermuscular coherence measures in synergistic muscles
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6008706/
https://www.ncbi.nlm.nih.gov/pubmed/29967654
http://dx.doi.org/10.1155/2018/4759232
work_keys_str_mv AT castronovoannamargherita effectoftaskfailureonintermuscularcoherencemeasuresinsynergisticmuscles
AT demarchiscristiano effectoftaskfailureonintermuscularcoherencemeasuresinsynergisticmuscles
AT schmidmaurizio effectoftaskfailureonintermuscularcoherencemeasuresinsynergisticmuscles
AT confortosilvia effectoftaskfailureonintermuscularcoherencemeasuresinsynergisticmuscles
AT severinigiacomo effectoftaskfailureonintermuscularcoherencemeasuresinsynergisticmuscles