Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts

Simon von Stengel, Wolfgang Kemmler Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany Background: The age-related decline in muscle strength is a well documented phenomenon in human beings. Resistance-type exercise including the novel, joint...

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Autores principales:	von Stengel S, Kemmler W
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2018
Materias:	ageing neuromuscular function muscle strength lower extremities trainability whole-body electromyostimulation men Geriatrics RC952-954.6
Acceso en línea:	https://doaj.org/article/56a2b881ff22401e9b200890cea65061
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spelling	oai:doaj.org-article:56a2b881ff22401e9b200890cea650612021-12-02T02:25:21ZTrainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts1178-1998https://doaj.org/article/56a2b881ff22401e9b200890cea650612018-12-01T00:00:00Zhttps://www.dovepress.com/trainability-of-leg-strength-by-whole-body-electromyostimulation-durin-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Simon von Stengel, Wolfgang Kemmler Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany Background: The age-related decline in muscle strength is a well documented phenomenon in human beings. Resistance-type exercise including the novel, joint-friendly, and time-efficient whole-body electromyostimulation (WB-EMS) technology decelerates this unfavorable decline. However, the issue of trainability of the neuromuscular system during different periods of life still remains, especially for WB-EMS. Thus, the aim of this study was to compare the changes in maximum isokinetic leg/hip extensor strength (MIES) and maximum isokinetic leg/hip flexor strength (MIFS) after WB-EMS interventions in men in different periods of life. Our hypothesis was that although WB-EMS significantly increases lower extremity strength in all periods of adults’ life, trainability decreases with age with a significantly higher increase at the age of 20–35 years compared with that at the age of 65+ years. Subjects and methods: Using an isokinetic leg press, we determined the changes in MIES and MIFS in 118 community-dwelling men aged 27–89 years after 14–16 weeks of WB-EMS interventions applying identical protocols. Men were structured in 15 year-ranged age groups starting at the age of 20–35 years and ending at the age of 80+ years. Results: Most importantly, WB-EMS-induced gains in MIES and MIFS were significant (P<0.001) in all the groups. Changes in MIFS were on average about twice as high compared with MIES (18–25% vs 9–15%). Applying one-way ANOVA, we observed a trend to lower trainability with increasing age (P=0.060) for MIES. Pairwise tests confirmed our hypothesis that the youngest subgroup differs significantly for MIES from men aged 65+ years (P=0.007). In parallel, one-way ANOVA determined a significant between-group difference (P=0.046) for MIFS; however, we did not determine a significant difference between men aged <35 years and 65+ years. Conclusion: We observed an inconsistent tendency for blunted WB-EMS-induced lower extremity strength gains in older adults. However, much more importantly, the general effectiveness of WB-EMS to significantly increase maximum hip/leg strength during the adult lifespan can be confirmed. Keywords: aging, neuromuscular function, muscle strength, lower extremities, trainability, whole-body electromyostimulation, menvon Stengel SKemmler WDove Medical Pressarticleageingneuromuscular functionmuscle strengthlower extremitiestrainabilitywhole-body electromyostimulationmenGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 13, Pp 2495-2502 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	ageing neuromuscular function muscle strength lower extremities trainability whole-body electromyostimulation men Geriatrics RC952-954.6
spellingShingle	ageing neuromuscular function muscle strength lower extremities trainability whole-body electromyostimulation men Geriatrics RC952-954.6 von Stengel S Kemmler W Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
description	Simon von Stengel, Wolfgang Kemmler Institute of Medical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany Background: The age-related decline in muscle strength is a well documented phenomenon in human beings. Resistance-type exercise including the novel, joint-friendly, and time-efficient whole-body electromyostimulation (WB-EMS) technology decelerates this unfavorable decline. However, the issue of trainability of the neuromuscular system during different periods of life still remains, especially for WB-EMS. Thus, the aim of this study was to compare the changes in maximum isokinetic leg/hip extensor strength (MIES) and maximum isokinetic leg/hip flexor strength (MIFS) after WB-EMS interventions in men in different periods of life. Our hypothesis was that although WB-EMS significantly increases lower extremity strength in all periods of adults’ life, trainability decreases with age with a significantly higher increase at the age of 20–35 years compared with that at the age of 65+ years. Subjects and methods: Using an isokinetic leg press, we determined the changes in MIES and MIFS in 118 community-dwelling men aged 27–89 years after 14–16 weeks of WB-EMS interventions applying identical protocols. Men were structured in 15 year-ranged age groups starting at the age of 20–35 years and ending at the age of 80+ years. Results: Most importantly, WB-EMS-induced gains in MIES and MIFS were significant (P<0.001) in all the groups. Changes in MIFS were on average about twice as high compared with MIES (18–25% vs 9–15%). Applying one-way ANOVA, we observed a trend to lower trainability with increasing age (P=0.060) for MIES. Pairwise tests confirmed our hypothesis that the youngest subgroup differs significantly for MIES from men aged 65+ years (P=0.007). In parallel, one-way ANOVA determined a significant between-group difference (P=0.046) for MIFS; however, we did not determine a significant difference between men aged <35 years and 65+ years. Conclusion: We observed an inconsistent tendency for blunted WB-EMS-induced lower extremity strength gains in older adults. However, much more importantly, the general effectiveness of WB-EMS to significantly increase maximum hip/leg strength during the adult lifespan can be confirmed. Keywords: aging, neuromuscular function, muscle strength, lower extremities, trainability, whole-body electromyostimulation, men
format	article
author	von Stengel S Kemmler W
author_facet	von Stengel S Kemmler W
author_sort	von Stengel S
title	Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
title_short	Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
title_full	Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
title_fullStr	Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
title_full_unstemmed	Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
title_sort	trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts
publisher	Dove Medical Press
publishDate	2018
url	https://doaj.org/article/56a2b881ff22401e9b200890cea65061
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Trainability of leg strength by whole-body electromyostimulation during adult lifespan: a study with male cohorts

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