Pre-Exercise Infrared Photobiomodulation Therapy (810nm) in Skeletal Muscle Performance and Postexercise Recovery in Humans: What Is the Optimal Power Output?

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de Oliveira, Adriano Rodrigues ; Vanin, Adriane Aver ; Tomazoni, Shaiane Silva ; Miranda, Eduardo Foschini ; Albuquerque-Pontes, Gianna Moes ; De Marchi, Thiago ; Grandinetti, Vanessa dos Santos ; Vicente de Paiva, Paulo Roberto ; Goncalves Imperatori, Treice Beatriz ; Camillo de Carvalho, Paulo de Tarso ; Bjordal, Jan Magnus ; Pinto Leal-Junior, Ernesto Cesar

• Document type: Journal article
• Source: Photomedicine and Laser Surgery; v. 35, n. 11, p. 9-pg., 2017-11-01.

Abstract

Background: Photobiomodulation therapy (PBMT) has recently been used to alleviate postexercise muscle fatigue and enhance recovery, demonstrating positive results. A previous study by our research group demonstrated the optimal dose for an infrared wavelength (810nm), but the outcomes could be optimized further with the determination of the optimal output power. Objective: The aim of the present study was to evaluate the effects of PBMT (through low-level laser therapy) on postexercise skeletal muscle recovery and identify the best output power. Materials and methods: A randomized, placebo-controlled double-blind clinical trial was conducted with the participation of 28 high-level soccer players. PBMT was applied before the eccentric contraction protocol with a cluster with five diodes, 810nm, dose of 10J, and output power of 100, 200, 400mW per diode or placebo at six sites of knee extensors. Maximum isometric voluntary contraction (MIVC), delayed onset muscle soreness (DOMS) and biochemical markers related to muscle damage (creatine kinase and lactate dehydrogenase), inflammation (IL-1, IL-6, and TNF-), and oxidative stress (catalase, superoxide dismutase, carbonylated proteins, and thiobarbituric acid) were evaluated before isokinetic exercise, as well as at 1min and at 1, 24, 48, 72, and 96h, after the eccentric contraction protocol. Results: PBMT increased MIVC and decreased DOMS and levels of biochemical markers (p<0.05) with the power output of 100 and 200mW, with better results for the power output of 100mW. Conclusions: PBMT with 100mW power output per diode (500mW total) before exercise achieves best outcomes in enhancing muscular performance and postexercise recovery. Another time it has been demonstrated that more power output is not necessarily better. (AU)

• FAPESP's process: 10/52404-0 - Low-level laser therapy in skeletal muscle fatigue and post-exercise recovery: Optimal parameters and effects in long-duration exercise
• Grantee: Ernesto Cesar Pinto Leal Junior
• Support Opportunities: Research Grants - Young Investigators Grants