Título :	Effects of short term elastic resistance training on muscle mass and strength in untrained older adults : a randomized clinical trial
Autor :	Martins, Wagner Rodrigues Safons, Marisete Peralta Bottaro, Martim Blasczyk, Juscelino Castro Diniz, Leonardo Rios Fonseca, Romulo Maia Carlos Rocha, Ana Clara Bonini Oliveira, Ricardo Jacó de
Assunto::	Treinamento Resistência Composição corporal Envelhecimento Aptidão física
Fecha de publicación :	12-ago-2015
Editorial :	BioMed Central
Citación :	MARTINS, Wagner Rodrigues et al. Effects of short term elastic resistance training on muscle mass and strength in untrained older adults: a randomized clinical trial. BMC Geriatrics, v. 15, Article 99, p. 1-10, 12 ago. 2015. Disponível em: <https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-015-0101-5>. Acesso em: 13 out. 2017. doi: https://doi.org/10.1186/s12877-015-0101-5.
Abstract:	Background: The current recommendations on resistance training involving older adults have reported an improvement of body composition variables. Despite this, there is a lack of knowledge on how elastic resistance training (ERT) affects the muscle mass in older adults population. The purpose of this study was to determine the effects of a short-term ERT on muscle mass of health and untrained older adults. Methods: Forty older adults were randomized into two groups of 20 individuals each: Control Group (CG = 66.2 ± 6.6 years) and Training Group (TG = 69.1 ± 6.3 years). TG underwent an ERT twice a week during 8 weeks and control group did not receive any specific intervention. The primary outcome was the upper and lower limbs muscle mass, measured by Dual-energy x-ray absorptiometry. The secondary outcomes were knee isokinetic peak torque (PT) at 60°/s and 120°/s speeds and isometric handgrip strength. A 2×2 mixed model (group [TG and CG] × time [pre and post]) analysis of variance (ANOVA) was applied to determine the effect on primary and secondary outcomes. Results: The results of the ANOVA showed no significant effects in group x time interaction for (1) upper limbs fat free mass (F [1.38] = 1.80, p = 0.19, effect size [ES] = 0.1) and for (2) lower limbs fat free mass (F [1.38] = 0.03, p = 0.88, ES = 0.02). Regarding muscle strength, the ANOVA showed no significant effects in group x time interaction for (3) PT at 60°/s (F [1.38] = 0.33, p = 0.56, ES = 3.0), for (4) PT at 120°/s (F [1.38] = 0.80, p = 0.38, ES = 4.1) and for handgrip strength (F [1.38] = 0.65, p = 0.42-value, ES = 0.9). Analysis of PT in TG showed a significant change of 4.5 %, but only at 120°/s (p = 0.01) when comparing pre and post-training (time interaction). Conclusions: Eight weeks of ERT did not show significant changes in muscle mass and strength of untrained older adults.
Licença::	© 2015 Martins et al. Open Access This 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.
DOI:	https://doi.org/10.1186/s12877-015-0101-5
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