Effects of short term elastic resistance training on muscle mass and strength in untrained older adults: a randomized clinical trial

BMC Geriatrics

Ricardo Jacó de Oliveira³  Ana Clara Bonini-Rocha²  Romulo Maia Carlos Fonseca¹  Leonardo Rios Diniz²  Juscelino Castro Blasczyk²  Martim Bottaro³  Marisete Peralta Safons³  Wagner Rodrigues Martins³ 

[1] Physical Education Department, Federal University of Pernambuco, Jornalista Anibal Fernandes Av, Campus Recife 50670-901, Recife, PE, Brazil;University of Brasilia, College of Physical Therapy, Campus Ceilândia, QNN 14, Ceilância Sul 72220-140, DF, Brazil;University of Brasilia, College of Physical Education, Campus Universitário Darcy Ribeiro, Brasilia 70904-970, DF, Brazil

关键词: Aging;    Dual-energy X-ray absorptiometry;    Muscle strength dynamometer;    Resistance training;    Randomized controlled trial;   

Others  :  1223048
DOI  :  10.1186/s12877-015-0101-5

 received in 2015-01-15, accepted in 2015-08-03,  发布年份 2015

【 摘 要 】

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.

Trial registration

NCT02253615 (09/25/14)

【 授权许可】

   
2015 Martins et al.

【 图 表 】

Fig. 1.

Fig. 2.

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