Effect of 808 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in elderly women

Effect of 808 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in elderly women

Author Toma, Renata Luri Autor UNIFESP Google Scholar
Tucci, Helga Tatiana Autor UNIFESP Google Scholar
Antunes, Hanna Karen Moreira Autor UNIFESP Google Scholar
Pedroni, Cristiane Rodrigues Google Scholar
Oliveira, Anamaria Siriani de Google Scholar
Buck, Isabela Autor UNIFESP Google Scholar
Ferreira, Pryscilla Dieguez Autor UNIFESP Google Scholar
Vassão, Patricia Gabrielli Autor UNIFESP Google Scholar
Renno, Ana Claudia Muniz Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ Estadual Paulista
Universidade de São Paulo (USP)
Abstract Aging process involves several structural changes in muscle tissue which lead to decrease in musculoskeletal function. One of the most common physiological modifications is the increase in fatigability in elderly people, which leads to inability to maintain strength and motor control. in this context, low-level laser therapy (LLLT) has demonstrated positive results in reducing fatigue during physical exercise. Thus, this study aimed to investigate the effects of LLLT on skeletal muscle fatigue in elderly women. Twenty-four subjects divided in two groups entered a crossover randomized triple-blinded placebo-controlled trial. Active LLLT (808 nm wavelength, 100 mW, energy 7 J) or an identical placebo LLLT was delivered on the rectus femoris muscle immediately before a fatigue protocol. Subjects performed a fatigue protocol which consisted of voluntary isotonic contractions of knee flexion-extension performed with a load corresponding to 75 % of 1-MR (Maximum Repetition) during 60 s. Surface electromyography (SEMG) signals were recorded from rectus femoris muscle of dominant lower limb to evaluate peripheral fatigability using median frequency analysis of SEMG signal. the number of repetitions of flexion-extension during fatigue protocol was also compared between groups. the values of median frequency were used to calculate the slope coefficient. the results showed no difference in the slope comparing placebo LLLT and active LLLT groups (p = 0.293). However, a significant difference was observed in the number of repetitions between groups, after active LLLT, subjects demonstrated significantly higher number of repetitions (p = 0.047). in this study, LLLT was efficient in increasing the mean number of repetitions during knee flexion-extension exercise, although results have not shown delay electromyographic fatigue.
Keywords Low-level laser therapy
Muscle fatigue
Muscular performance
Language English
Sponsor Department of Biosciences of the Federal University of São Paulo
University of Estadual Paulista Julio de Mesquita Filho
São Paulo University
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Date 2013-09-01
Published in Lasers in Medical Science. London: Springer London Ltd, v. 28, n. 5, p. 1375-1382, 2013.
ISSN 0268-8921 (Sherpa/Romeo, impact factor)
Publisher Springer
Extent 1375-1382
Origin https://dx.doi.org/10.1007/s10103-012-1246-5
Access rights Closed access
Type Article
Web of Science ID WOS:000323742200020
URI https://repositorio.unifesp.br/handle/11600/36697

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