Cargando…

Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise

BACKGROUND: The flexion relaxation phenomenon (FRP) has been widely investigated. Nevertheless, no study has been reported on the FRP as well as spasm response to large lifting load. The aim of this study was to evaluate the effect of large lifting load on the FRP response and spasm during execution...

Descripción completa

Detalles Bibliográficos
Autores principales: Ma, Yanjun, Shan, Xinhai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5707781/
https://www.ncbi.nlm.nih.gov/pubmed/29187168
http://dx.doi.org/10.1186/s12891-017-1869-6
_version_ 1783282507967365120
author Ma, Yanjun
Shan, Xinhai
author_facet Ma, Yanjun
Shan, Xinhai
author_sort Ma, Yanjun
collection PubMed
description BACKGROUND: The flexion relaxation phenomenon (FRP) has been widely investigated. Nevertheless, no study has been reported on the FRP as well as spasm response to large lifting load. The aim of this study was to evaluate the effect of large lifting load on the FRP response and spasm during execution of a flexion-extension exercise. METHODS: Twenty-two healthy male university students without low back pain history participated this study. Subjects randomly performed three trials of trunk flexion-extension cycles of 5 s flexion and 5 s extension in each of 4 conditions (three large lifting loads of 15, 20 and 25 kg and one lifting load of 0 kg for comparison). Surface EMG from bilateral erector spinae was recorded during the performance of a trunk anterior flexion-extension exercise. The relaxation phase was determined through the onset of electromyography (EMG) signals. Spasm was evaluated in the relaxation period. The mean normalized electromyography (NEMG) was derived from the raw EMG. RESULTS: Spasm was observed in more than 45% of the individuals and the intensity of muscle activation was increased by more than 78% in the relaxation phase. CONCLUSIONS: A large lifting load could lead to a high prevalence of spasms as well as a high intensity of muscle activations on erector spinae muscle in the relaxation period, which may be associated with the development of low back disorder during the performance of a flexion-extension exercise.
format Online
Article
Text
id pubmed-5707781
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher BioMed Central
record_format MEDLINE/PubMed
spelling pubmed-57077812017-12-06 Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise Ma, Yanjun Shan, Xinhai BMC Musculoskelet Disord Research Article BACKGROUND: The flexion relaxation phenomenon (FRP) has been widely investigated. Nevertheless, no study has been reported on the FRP as well as spasm response to large lifting load. The aim of this study was to evaluate the effect of large lifting load on the FRP response and spasm during execution of a flexion-extension exercise. METHODS: Twenty-two healthy male university students without low back pain history participated this study. Subjects randomly performed three trials of trunk flexion-extension cycles of 5 s flexion and 5 s extension in each of 4 conditions (three large lifting loads of 15, 20 and 25 kg and one lifting load of 0 kg for comparison). Surface EMG from bilateral erector spinae was recorded during the performance of a trunk anterior flexion-extension exercise. The relaxation phase was determined through the onset of electromyography (EMG) signals. Spasm was evaluated in the relaxation period. The mean normalized electromyography (NEMG) was derived from the raw EMG. RESULTS: Spasm was observed in more than 45% of the individuals and the intensity of muscle activation was increased by more than 78% in the relaxation phase. CONCLUSIONS: A large lifting load could lead to a high prevalence of spasms as well as a high intensity of muscle activations on erector spinae muscle in the relaxation period, which may be associated with the development of low back disorder during the performance of a flexion-extension exercise. BioMed Central 2017-11-29 /pmc/articles/PMC5707781/ /pubmed/29187168 http://dx.doi.org/10.1186/s12891-017-1869-6 Text en © The Author(s). 2017 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Ma, Yanjun
Shan, Xinhai
Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title_full Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title_fullStr Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title_full_unstemmed Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title_short Spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
title_sort spasm and flexion-relaxation phenomenon response to large lifting load during the performance of a trunk flexion-extension exercise
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5707781/
https://www.ncbi.nlm.nih.gov/pubmed/29187168
http://dx.doi.org/10.1186/s12891-017-1869-6
work_keys_str_mv AT mayanjun spasmandflexionrelaxationphenomenonresponsetolargeliftingloadduringtheperformanceofatrunkflexionextensionexercise
AT shanxinhai spasmandflexionrelaxationphenomenonresponsetolargeliftingloadduringtheperformanceofatrunkflexionextensionexercise