Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study

Bokun Kim,1 Takehiko Tsujimoto,2,3 Rina So,4 Xiaoguang Zhao,5 Sechang Oh,6,7 Kiyoji Tanaka2 1Faculty of Sports Health Care, Inje University, Gyeongsangnamdo, Republic of Korea; 2Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, 3Faculty of Human Sciences, Shimane University, Shim...

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Autores principales:	Kim B, Tsujimoto T, So R, Zhao X, Oh S, Tanaka K
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2017
Materias:	Dietary restriction muscle mass muscle strength obesity weight reduction Specialties of internal medicine RC581-951
Acceso en línea:	https://doaj.org/article/e9fe285f48514b54a52773a064c98f99
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spelling	oai:doaj.org-article:e9fe285f48514b54a52773a064c98f992021-12-02T00:15:31ZChanges in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study1178-7007https://doaj.org/article/e9fe285f48514b54a52773a064c98f992017-05-01T00:00:00Zhttps://www.dovepress.com/changes-in-muscle-strength-after-diet-induced-weight-reduction-in-adul-peer-reviewed-article-DMSOhttps://doaj.org/toc/1178-7007Bokun Kim,1 Takehiko Tsujimoto,2,3 Rina So,4 Xiaoguang Zhao,5 Sechang Oh,6,7 Kiyoji Tanaka2 1Faculty of Sports Health Care, Inje University, Gyeongsangnamdo, Republic of Korea; 2Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, 3Faculty of Human Sciences, Shimane University, Shimane, 4Research Center for Overwork-Related Disorders, National Institute of Occupational Safety and Health, Kawasaki, Kanagawa, 5Doctoral Program in Sports Medicine, Graduate School of Comprehensive Human Sciences, 6Faculty of Medicine, University of Tsukuba, 7The Center of Sports Medicine and Health Sciences, University of Tsukuba Hospital, Tsukuba, Ibaraki, Japan Background and objective: The benefits of weight reduction for musculoskeletal disorders are well understood. Steep declines in muscle mass following considerable weight reduction can decrease muscle strength and, consequently, physical performance. However, only a limited number of studies have examined the changes in muscle mass and strength in the context of interventional weight reduction programs. Thus, we investigated the influence of muscle mass decrease caused by diet-induced weight reduction on muscle strength in obese men.Methods: A total of 24 men with obesity (body mass index [BMI]: 29.2 ± 2.6 kg/m2; age: 52.4 ± 10.0 years) attended a 12-week weight reduction program that implemented dietary restrictions. Each participant underwent assessments of body weight (by a digital scale), body composition (by whole-body dual-energy X-ray absorptiometry [DEXA]), and upper and lower extremity muscle strength (by a hand-held dynamometer and a Biodex System 3 dynamometer, respectively) before and after the program.Results: The program led to significant reductions of 10.5% of weight and 6.1% of lower extremity muscle mass. Similarly, lower extremity muscle strength (measured using a Biodex System 3 dynamometer) was significantly decreased (isometric 60° peak torque decreased by 10% and isokinetic 60°/s peak torque decreased by 9.4%); however, the level of body weight-normalized lower extremity muscle strength did not significantly change (increased by +1.2% and +1.4%). The decrease in muscle strength was related to but did not entirely depend on decrease in muscle mass. Although handgrip strength did not significantly differ (−2.2%), the weight-normalized level of this parameter significantly improved (+9.1%). In addition, decrease in the percentage of whole-body fat mass and increase in the percentage of muscle mass index were observed.Conclusion: We recommend performing exercise after diet-induced weight reduction to regain muscle mass and strength and improve body weight-normalized lower extremity muscle strength. Keywords: dietary restriction, muscle mass, muscle strength, obesity, weight reductionKim BTsujimoto TSo RZhao XOh STanaka KDove Medical PressarticleDietary restrictionmuscle massmuscle strengthobesityweight reductionSpecialties of internal medicineRC581-951ENDiabetes, Metabolic Syndrome and Obesity: Targets and Therapy, Vol Volume 10, Pp 187-194 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dietary restriction muscle mass muscle strength obesity weight reduction Specialties of internal medicine RC581-951
spellingShingle	Dietary restriction muscle mass muscle strength obesity weight reduction Specialties of internal medicine RC581-951 Kim B Tsujimoto T So R Zhao X Oh S Tanaka K Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
description	Bokun Kim,1 Takehiko Tsujimoto,2,3 Rina So,4 Xiaoguang Zhao,5 Sechang Oh,6,7 Kiyoji Tanaka2 1Faculty of Sports Health Care, Inje University, Gyeongsangnamdo, Republic of Korea; 2Faculty of Health and Sport Sciences, University of Tsukuba, Ibaraki, 3Faculty of Human Sciences, Shimane University, Shimane, 4Research Center for Overwork-Related Disorders, National Institute of Occupational Safety and Health, Kawasaki, Kanagawa, 5Doctoral Program in Sports Medicine, Graduate School of Comprehensive Human Sciences, 6Faculty of Medicine, University of Tsukuba, 7The Center of Sports Medicine and Health Sciences, University of Tsukuba Hospital, Tsukuba, Ibaraki, Japan Background and objective: The benefits of weight reduction for musculoskeletal disorders are well understood. Steep declines in muscle mass following considerable weight reduction can decrease muscle strength and, consequently, physical performance. However, only a limited number of studies have examined the changes in muscle mass and strength in the context of interventional weight reduction programs. Thus, we investigated the influence of muscle mass decrease caused by diet-induced weight reduction on muscle strength in obese men.Methods: A total of 24 men with obesity (body mass index [BMI]: 29.2 ± 2.6 kg/m2; age: 52.4 ± 10.0 years) attended a 12-week weight reduction program that implemented dietary restrictions. Each participant underwent assessments of body weight (by a digital scale), body composition (by whole-body dual-energy X-ray absorptiometry [DEXA]), and upper and lower extremity muscle strength (by a hand-held dynamometer and a Biodex System 3 dynamometer, respectively) before and after the program.Results: The program led to significant reductions of 10.5% of weight and 6.1% of lower extremity muscle mass. Similarly, lower extremity muscle strength (measured using a Biodex System 3 dynamometer) was significantly decreased (isometric 60° peak torque decreased by 10% and isokinetic 60°/s peak torque decreased by 9.4%); however, the level of body weight-normalized lower extremity muscle strength did not significantly change (increased by +1.2% and +1.4%). The decrease in muscle strength was related to but did not entirely depend on decrease in muscle mass. Although handgrip strength did not significantly differ (−2.2%), the weight-normalized level of this parameter significantly improved (+9.1%). In addition, decrease in the percentage of whole-body fat mass and increase in the percentage of muscle mass index were observed.Conclusion: We recommend performing exercise after diet-induced weight reduction to regain muscle mass and strength and improve body weight-normalized lower extremity muscle strength. Keywords: dietary restriction, muscle mass, muscle strength, obesity, weight reduction
format	article
author	Kim B Tsujimoto T So R Zhao X Oh S Tanaka K
author_facet	Kim B Tsujimoto T So R Zhao X Oh S Tanaka K
author_sort	Kim B
title	Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
title_short	Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
title_full	Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
title_fullStr	Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
title_full_unstemmed	Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
title_sort	changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study
publisher	Dove Medical Press
publishDate	2017
url	https://doaj.org/article/e9fe285f48514b54a52773a064c98f99
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Changes in muscle strength after diet-induced weight reduction in adult men with obesity: a prospective study

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