Effects of Low-Level Laser Therapy on Biceps Braquialis Muscle Fatigue in Young Women

Effects of Low-Level Laser Therapy on Biceps Braquialis Muscle Fatigue in Young Women

Author Higashi, Renan Hideki Autor UNIFESP Google Scholar
Toma, Renata Luri Autor UNIFESP Google Scholar
Tucci, Helga Tatiana Autor UNIFESP Google Scholar
Pedroni, Cristiane Rodrigues Google Scholar
Ferreira, Pryscilla Dieguez Autor UNIFESP Google Scholar
Baldini, Gabriel Autor UNIFESP Google Scholar
Aveiro, Mariana Chaves Autor UNIFESP Google Scholar
Borghi-Silva, Audrey Google Scholar
Oliveira, Anamaria Siriani de Google Scholar
Muniz Renno, Ana Claudia Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Estadual Univ Paulista Julio de Mesquita Filho
Universidade Federal de São Carlos (UFSCar)
Universidade de São Paulo (USP)
Abstract Objective: This study aims to investigate the effects of low-level laser therapy (LLLT) on biceps brachi muscular fatigue in 20 young females. Background data: Exhausting physical activity leads to muscular fatigue, which could decrease muscular strength, and may cause impairment in motor control and muscle pain. Several biochemical and biophysical resources have been studied in an attempt to accelerate the recovery of muscle fatigue. Among these, LLLT is emphasized. Methods: Twenty subjects were randomized in one laser group and one placebo group in two sessions of a crossover design experimental procedure; the second session taking place within 7 days of the first. in the first session, subjects underwent a collection of surface electromyographic (SEMG) data of the biceps brachii muscle, followed by active or placebo LLLT at the same muscle, followed then by another EMG sample of biceps brachii. Blood samples were collected five times during the experimental procedure. Second session procedures were identical to the first, with exception of LLLT, which was the opposite of the first session. the fatigue protocol consisted of 60sec of elbow flexion-extension movement performed with 75% of one maximum repetition. Blood lactate, EMG fatigue, and the number of elbow flexion-extension repetitions during the fatigue protocol were used to evaluate the effects of laser therapy (808nm wavelength, 100mW output power, power density of 35.7 W/cm(2), 70sec each point and 7J/point on eight points). Results: No statistical differences were found for eletromyographic fatigue and blood lactate values between groups. Mean numbers of elbow flexion-extension repetitions were 22.6 +/- 7.58 after placebo, and 25.1 +/- 9.89 after active LLLT group, but these differences were not statistically significant (p=0.342). Conclusions: LLLT had limited effects on delaying muscle fatigue in a young female sample, although a tendency was observed in the active laser group toward showing lower electromyography fatigue of biceps brachii muscle. No intergroup differences were found in the number of muscle contractions and lactate concentration.
Language English
Date 2013-12-01
Published in Photomedicine and Laser Surgery. New Rochelle: Mary Ann Liebert, Inc, v. 31, n. 12, p. 586-594, 2013.
ISSN 1549-5418 (Sherpa/Romeo, impact factor)
Publisher Mary Ann Liebert, Inc
Extent 586-594
Origin http://dx.doi.org/10.1089/pho.2012.3388
Access rights Closed access
Type Article
Web of Science ID WOS:000330527300005
URI http://repositorio.unifesp.br/handle/11600/37055

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