Abstract
Skeletal muscle fatigue and recovery is a novel area of research in Low-Level Laser Therapy (LLLT). Recent studies of our research group with phototherapy have shown positive results delaying skeletal muscle fatigue and improving the status of biochemical markers related to skeletal muscle recovery when these therapies were applied before exercise. However, several factors still remain unknown such as: optimal doses and treatment parameters, mechanisms, the effects in long-duration exercises and long-term effects in skeletal muscle recovery. With these factors in mind, the aims of this project are: To evaluate the long-term effects of LLLT in post-exercise skeletal muscle recovery and to identify the optimal dose of LLLT. It will be performed a randomized, double-blinded, placebo-controlled trial, with voluntary participation of high-level soccer athletes. We will analyse parameters related to volunteers exercise performance (torque peak / maximum voluntary contraction - MVC), delayed onset muscle soreness (DOMS), and biochemical markers of muscle damage (CK and LDH), inflammation (IL-1, IL-6 and TNF-±) and oxidative stress (TBARS, CAT, SOD and carbonyled proteins). The analysis will be performed before exercise protocols, after 1 minute, and 1, 24, 48, 72 and 96 hours after the end of exercise protocol.
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