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Influence of preactivation on fascicle behavior during eccentric contraction
BACKGROUND: Because muscle fascicle behavior affects to the force-generating capability, understanding of muscle fascicle length changes during dynamic movements is important. Preactivation may affect the muscle fascicle length changes, especially in the case of eccentric contraction. However, its i...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4912522/ https://www.ncbi.nlm.nih.gov/pubmed/27386245 http://dx.doi.org/10.1186/s40064-016-2550-5 |
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author | Fukutani, Atsuki Misaki, Jun Isaka, Tadao |
author_facet | Fukutani, Atsuki Misaki, Jun Isaka, Tadao |
author_sort | Fukutani, Atsuki |
collection | PubMed |
description | BACKGROUND: Because muscle fascicle behavior affects to the force-generating capability, understanding of muscle fascicle length changes during dynamic movements is important. Preactivation may affect the muscle fascicle length changes, especially in the case of eccentric contraction. However, its influence has not been clarified. To this end, muscle fascicle behavior during eccentric contraction was compared between preactivation and no-preactivation conditions. RESULTS: Seven healthy men (24.6 ± 2.2 years, 169 ± 2 cm, 68.0 ± 5.1 kg) participated in this study. An eccentric knee extension controlled by a Biodex system was adopted as the testing motion. Muscle fascicle behavior of vastus lateralis during eccentric knee extensions was compared following two conditions. In preactivation condition, isometric preactivation was conducted before initiating eccentric contraction. On the other hand, in no-preactivation condition, muscle contraction was initiated immediately after initiating the knee angle change induced by a dynamometer. The muscle fascicle length at the onset of eccentric contraction was significantly shorter in preactivation condition than in no-preactivation condition (Cohen’s d = 0.98, p < 0.001) although that at the end of eccentric contraction was not different (Cohen’s d = 0.08, p = 0.844). The muscle fascicle was elongated throughout the eccentric contraction phase in preactivation condition. On the other hand, muscle fascicle was shortened in the first part, and then elongated in the latter part of the eccentric contraction phase in no-preactivation condition. CONCLUSIONS: The muscle fascicle is shortened even during eccentric contraction phase. However, this shortening is disappeared when preactivation is conducted. |
format | Online Article Text |
id | pubmed-4912522 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-49125222016-07-06 Influence of preactivation on fascicle behavior during eccentric contraction Fukutani, Atsuki Misaki, Jun Isaka, Tadao Springerplus Short Report BACKGROUND: Because muscle fascicle behavior affects to the force-generating capability, understanding of muscle fascicle length changes during dynamic movements is important. Preactivation may affect the muscle fascicle length changes, especially in the case of eccentric contraction. However, its influence has not been clarified. To this end, muscle fascicle behavior during eccentric contraction was compared between preactivation and no-preactivation conditions. RESULTS: Seven healthy men (24.6 ± 2.2 years, 169 ± 2 cm, 68.0 ± 5.1 kg) participated in this study. An eccentric knee extension controlled by a Biodex system was adopted as the testing motion. Muscle fascicle behavior of vastus lateralis during eccentric knee extensions was compared following two conditions. In preactivation condition, isometric preactivation was conducted before initiating eccentric contraction. On the other hand, in no-preactivation condition, muscle contraction was initiated immediately after initiating the knee angle change induced by a dynamometer. The muscle fascicle length at the onset of eccentric contraction was significantly shorter in preactivation condition than in no-preactivation condition (Cohen’s d = 0.98, p < 0.001) although that at the end of eccentric contraction was not different (Cohen’s d = 0.08, p = 0.844). The muscle fascicle was elongated throughout the eccentric contraction phase in preactivation condition. On the other hand, muscle fascicle was shortened in the first part, and then elongated in the latter part of the eccentric contraction phase in no-preactivation condition. CONCLUSIONS: The muscle fascicle is shortened even during eccentric contraction phase. However, this shortening is disappeared when preactivation is conducted. Springer International Publishing 2016-06-17 /pmc/articles/PMC4912522/ /pubmed/27386245 http://dx.doi.org/10.1186/s40064-016-2550-5 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Short Report Fukutani, Atsuki Misaki, Jun Isaka, Tadao Influence of preactivation on fascicle behavior during eccentric contraction |
title | Influence of preactivation on fascicle behavior during eccentric contraction |
title_full | Influence of preactivation on fascicle behavior during eccentric contraction |
title_fullStr | Influence of preactivation on fascicle behavior during eccentric contraction |
title_full_unstemmed | Influence of preactivation on fascicle behavior during eccentric contraction |
title_short | Influence of preactivation on fascicle behavior during eccentric contraction |
title_sort | influence of preactivation on fascicle behavior during eccentric contraction |
topic | Short Report |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4912522/ https://www.ncbi.nlm.nih.gov/pubmed/27386245 http://dx.doi.org/10.1186/s40064-016-2550-5 |
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