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Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals

PURPOSE: Redundancy of the musculoskeletal system implies multiple strategies are theoretically available to coordinate back extensor muscles. This study investigated whether coordination between back muscles during a tightly constrained isometric trunk extension task varies within and between indiv...

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Autores principales: Tier, Louise, Salomoni, Sauro E., Hug, François, Besomi, Manuela, Hodges, Paul W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10460738/
https://www.ncbi.nlm.nih.gov/pubmed/37079082
http://dx.doi.org/10.1007/s00421-023-05193-5
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author Tier, Louise
Salomoni, Sauro E.
Hug, François
Besomi, Manuela
Hodges, Paul W.
author_facet Tier, Louise
Salomoni, Sauro E.
Hug, François
Besomi, Manuela
Hodges, Paul W.
author_sort Tier, Louise
collection PubMed
description PURPOSE: Redundancy of the musculoskeletal system implies multiple strategies are theoretically available to coordinate back extensor muscles. This study investigated whether coordination between back muscles during a tightly constrained isometric trunk extension task varies within and between individuals, and whether this changes following brief exposure to activation feedback of a muscle. METHODS: Nine healthy participants performed three blocks of two repetitions of ramped isometric trunk extension in side-lying against resistance from 0–30% of maximum voluntary contraction over 30 s (force feedback). Between blocks, participants repeated contractions with visual feedback of electromyography (EMG) from either superficial (SM) or deep multifidus (DM), in two conditions; ‘After SM’ and ‘After DM’. Intramuscular EMG was recorded from SM, DM, and longissimus (LG) simultaneously with shear wave elastography (SWE) from SM or DM. RESULTS: In the ‘Natural’ condition (force feedback only), group data showed incremental increases in EMG with force, with minor changes in distribution of activation between muscles as force increased. SM was the most active muscle during the ‘Natural’ condition, but with DM most active in some participants. Individual data showed that coordination between muscles differed substantially between repetitions and individuals. Brief exposure to EMG feedback altered coordination. SWE showed individual variation, but findings differed from EMG. CONCLUSION: This study revealed substantial variation in coordination between back extensor muscles within and between participants, and after exposure to feedback, in a tightly constrained task. Shear modulus revealed similar variation, but with an inconsistent relationship to EMG. These data highlight highly flexible control of back muscles.
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spelling pubmed-104607382023-08-29 Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals Tier, Louise Salomoni, Sauro E. Hug, François Besomi, Manuela Hodges, Paul W. Eur J Appl Physiol Original Article PURPOSE: Redundancy of the musculoskeletal system implies multiple strategies are theoretically available to coordinate back extensor muscles. This study investigated whether coordination between back muscles during a tightly constrained isometric trunk extension task varies within and between individuals, and whether this changes following brief exposure to activation feedback of a muscle. METHODS: Nine healthy participants performed three blocks of two repetitions of ramped isometric trunk extension in side-lying against resistance from 0–30% of maximum voluntary contraction over 30 s (force feedback). Between blocks, participants repeated contractions with visual feedback of electromyography (EMG) from either superficial (SM) or deep multifidus (DM), in two conditions; ‘After SM’ and ‘After DM’. Intramuscular EMG was recorded from SM, DM, and longissimus (LG) simultaneously with shear wave elastography (SWE) from SM or DM. RESULTS: In the ‘Natural’ condition (force feedback only), group data showed incremental increases in EMG with force, with minor changes in distribution of activation between muscles as force increased. SM was the most active muscle during the ‘Natural’ condition, but with DM most active in some participants. Individual data showed that coordination between muscles differed substantially between repetitions and individuals. Brief exposure to EMG feedback altered coordination. SWE showed individual variation, but findings differed from EMG. CONCLUSION: This study revealed substantial variation in coordination between back extensor muscles within and between participants, and after exposure to feedback, in a tightly constrained task. Shear modulus revealed similar variation, but with an inconsistent relationship to EMG. These data highlight highly flexible control of back muscles. Springer Berlin Heidelberg 2023-04-20 2023 /pmc/articles/PMC10460738/ /pubmed/37079082 http://dx.doi.org/10.1007/s00421-023-05193-5 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Article
Tier, Louise
Salomoni, Sauro E.
Hug, François
Besomi, Manuela
Hodges, Paul W.
Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title_full Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title_fullStr Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title_full_unstemmed Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title_short Adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
title_sort adaptability of the load sharing between the longissimus and components of the multifidus muscle during isometric trunk extension in healthy individuals
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10460738/
https://www.ncbi.nlm.nih.gov/pubmed/37079082
http://dx.doi.org/10.1007/s00421-023-05193-5
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