Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men

Although several studies have investigated the back-muscle flexion–relaxation phenomenon (FRP), the effect of individual flexibility on the FRP has been discussed infrequently, with very limited data on the influence of flexibility training on the FRP. This study thus examined the effect of flexibil...

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Autores principales:	Yi-Lang Chen, Wei-Cheng Lin, Ying-Hua Liao, Yi Chen, Pei-Yu Kang
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0adf70fbd63243bd95b9e4637cb585fa
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spelling	oai:doaj.org-article:0adf70fbd63243bd95b9e4637cb585fa2021-11-11T08:14:55ZChanging the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men1932-6203https://doaj.org/article/0adf70fbd63243bd95b9e4637cb585fa2021-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8570481/?tool=EBIhttps://doaj.org/toc/1932-6203Although several studies have investigated the back-muscle flexion–relaxation phenomenon (FRP), the effect of individual flexibility on the FRP has been discussed infrequently, with very limited data on the influence of flexibility training on the FRP. This study thus examined the effect of flexibility training on the change of back-muscle FRP pattern in relatively inflexible young men. We collected and analyzed the valid data from 20 male participants (10 each with high and low flexibility included in the control and trained groups, respectively) when flexing their trunks at seven trunk flexion positions (0°–90°, in increments of 15°); their erector spinae and hamstring activation, pelvic tilt, and lumbosacral angle were then recorded. After 7 weeks of flexibility training for the low-flexibility group, no difference in flexibility was discovered between this group and the control (originally high-flexibility) group. The trunk flexion experiment was then repeated. The results showed that before the training stage, the low-flexibility group had lower erector spinae and higher hamstring activation, a larger pelvic tilt, and a smaller lumbosacral angle. By contrast, after training, the erector spinae and hamstring activation, pelvic tilt, and lumbosacral angle were significantly changed, and no intergroup differences were observed in FRP patterns. The study results suggest that flexibility training changes lumbopelvic movement and thereby reduces the degree of the back-muscle FRP when trunk flexion is performed.Yi-Lang ChenWei-Cheng LinYing-Hua LiaoYi ChenPei-Yu KangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yi-Lang Chen Wei-Cheng Lin Ying-Hua Liao Yi Chen Pei-Yu Kang Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
description	Although several studies have investigated the back-muscle flexion–relaxation phenomenon (FRP), the effect of individual flexibility on the FRP has been discussed infrequently, with very limited data on the influence of flexibility training on the FRP. This study thus examined the effect of flexibility training on the change of back-muscle FRP pattern in relatively inflexible young men. We collected and analyzed the valid data from 20 male participants (10 each with high and low flexibility included in the control and trained groups, respectively) when flexing their trunks at seven trunk flexion positions (0°–90°, in increments of 15°); their erector spinae and hamstring activation, pelvic tilt, and lumbosacral angle were then recorded. After 7 weeks of flexibility training for the low-flexibility group, no difference in flexibility was discovered between this group and the control (originally high-flexibility) group. The trunk flexion experiment was then repeated. The results showed that before the training stage, the low-flexibility group had lower erector spinae and higher hamstring activation, a larger pelvic tilt, and a smaller lumbosacral angle. By contrast, after training, the erector spinae and hamstring activation, pelvic tilt, and lumbosacral angle were significantly changed, and no intergroup differences were observed in FRP patterns. The study results suggest that flexibility training changes lumbopelvic movement and thereby reduces the degree of the back-muscle FRP when trunk flexion is performed.
format	article
author	Yi-Lang Chen Wei-Cheng Lin Ying-Hua Liao Yi Chen Pei-Yu Kang
author_facet	Yi-Lang Chen Wei-Cheng Lin Ying-Hua Liao Yi Chen Pei-Yu Kang
author_sort	Yi-Lang Chen
title	Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
title_short	Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
title_full	Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
title_fullStr	Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
title_full_unstemmed	Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
title_sort	changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/0adf70fbd63243bd95b9e4637cb585fa
work_keys_str_mv	AT yilangchen changingthepatternofthebackmuscleflexionrelaxationphenomenonthroughflexibilitytraininginrelativelyinflexibleyoungmen AT weichenglin changingthepatternofthebackmuscleflexionrelaxationphenomenonthroughflexibilitytraininginrelativelyinflexibleyoungmen AT yinghualiao changingthepatternofthebackmuscleflexionrelaxationphenomenonthroughflexibilitytraininginrelativelyinflexibleyoungmen AT yichen changingthepatternofthebackmuscleflexionrelaxationphenomenonthroughflexibilitytraininginrelativelyinflexibleyoungmen AT peiyukang changingthepatternofthebackmuscleflexionrelaxationphenomenonthroughflexibilitytraininginrelativelyinflexibleyoungmen
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Changing the pattern of the back-muscle flexion–relaxation phenomenon through flexibility training in relatively inflexible young men

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