Effect of 655-nm low-level laser therapy on exercise-induced skeletal muscle fatigue in humans
Leal Junior EC, Lopes-Martins RA, Lopes-Martins RA, Dalan F, Ferrari M, Sbabo FM, Generosi RA, Baroni BM, Penna SC, Iversen VV, Bjordal JM
Photomedicine and laser surgery · 126 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Universidad u hospital
- Universidade de São Paulo
Según 1 financiador declarado.
Publicación
- Publicado
- 2008-09-25 · Photomed Laser Surg · vol. 26 · número 5 · págs. 419–424
- Editorial
- Mary Ann Liebert, Inc.
- Citado
- 183 citas · más que el 97% de estudios similares · 7.2× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 27 trabajos
- Acceso
- De pago
- Áreas de investigación
- Laser Applications in Dentistry and Medicine · Exercise and Physiological Responses · Sports Performance and Training
- Palabras clave
- low-level laser therapy, skeletal muscle fatigue, exercise fatigue, biceps brachii, blood lactate, oxidative stress, volleyball players
- MeSH
- muscle, skeletal, humans, exercise, double-blind method, muscle fatigue, muscle contraction, adult, male, low-level light therapy
10 autores
- Ernesto César Pinto Leal‐Junior🇧🇷🇳🇴Universidade de Caxias do Sul; University of Bergen
- Rodrigo Álvaro Brandão Lopes‐Martins🇧🇷Universidade de São Paulo
- Francis Dalan🇧🇷Universidade de Caxias do Sul
- Maurício Ferrari🇧🇷Universidade de Caxias do Sul
- Fernando Montanari Sbabo🇧🇷Universidade de Caxias do Sul
- Rafael Abeche Generosi🇧🇷Universidade de Caxias do Sul
- Bruno Manfredini Baroni🇧🇷Universidade de Caxias do Sul
- Sócrates Penna🇧🇷Universidade de São Paulo
- Vegard Vereide Iversen🇳🇴University of Bergen
- Jan Magnus Bjordal🇳🇴Høgskolen i Bergen; University of Bergen
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objective
To investigate if development of skeletal muscle fatigue during repeated voluntary biceps contractions could be attenuated by low-level laser therapy (LLLT).
Background data
Previous animal studies have indicated that LLLT can reduce oxidative stress and delay the onset of skeletal muscle fatigue.
Materials and methods
Twelve male professional volleyball players were entered into a randomized double-blind placebo-controlled trial, for two sessions (on day 1 and day 8) at a 1-wk interval, with both groups performing as many voluntary biceps contractions as possible, with a load of 75% of the maximal voluntary contraction force (MVC). At the second session on day 8, the groups were either given LLLT (655 nm) of 5 J at an energy density of 500 J/cm2 administered at each of four points along the middle of the biceps muscle belly, or placebo LLLT in the same manner immediately before the exercise session. The number of muscle contractions with 75% of MVC was counted by a blinded observer and blood lactate concentration was measured.
Results
Compared to the first session (on day 1), the mean number of repetitions increased significantly by 8.5 repetitions (+/- 1.9) in the active LLLT group at the second session (on day 8), while in the placebo LLLT group the increase was only 2.7 repetitions (+/- 2.9) (p = 0.0001). At the second session, blood lactate levels increased from a pre-exercise mean of 2.4 mmol/L (+/- 0.5 mmol/L), to 3.6 mmol/L (+/- 0.5 mmol/L) in the placebo group, and to 3.8 mmol/L (+/- 0.4 mmol/L) in the active LLLT group after exercise, but this difference between groups was not statistically significant.
Conclusion
We conclude that LLLT appears to delay the onset of muscle fatigue and exhaustion by a local mechanism in spite of increased blood lactate levels.
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