Does photobiomodulation therapy combined to static magnetic field (PBMT-sMF) promote ergogenic effects even when the exe
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(2020) 12:49
RESEARCH ARTICLE
Open Access
Does photobiomodulation therapy combined to static magnetic field (PBMTsMF) promote ergogenic effects even when the exercised muscle group is not irradiated? A randomized, triple-blind, placebo-controlled trial Caroline dos Santos Monteiro Machado1,2, Heliodora Leão Casalechi1,2, Adriane Aver Vanin2, Jônatas Bezerra de Azevedo2, Paulo de Tarso Camillo de Carvalho2 and Ernesto Cesar Pinto Leal-Junior1,2,3*
Abstract Background: The direct application of photobiomodulation therapy (PBMT) using low-level laser therapy (LLLT) and light emitting diodes (LEDs) combined with a static magnetic field (sMF) (PBMT-sMF) to target tissues is shown to improve muscle performance and recovery. Studies have reported possible PBMT effects when a local distant to the target tissue is irradiated. Notably, the extent of these effects on musculoskeletal performance and the optimal site of irradiation remain unclear, although this information is clinically important since these aspects could directly affect the magnitude of the effect. Therefore, we investigated the effects of local and non-local PBMT-sMF irradiations on musculoskeletal performance and post-exercise recovery before an eccentric exercise protocol. Methods: This randomized, triple-blind (participants, therapists and assessors), placebo-controlled trial included 30 healthy male volunteers randomly assigned to the placebo, local, and non-local groups. Active or placebo PBMTsMF was applied to 6 sites of the quadriceps muscle of both legs. An eccentric exercise protocol was used to induce fatigue. The primary outcome was peak torque assessed by maximal voluntary contraction (MVC). The secondary outcomes were delayed onset muscle soreness (DOMS) measured by visual analogue scale (VAS), muscle injury assessed by serum creatine kinase activity (CK), and blood lactate levels. Evaluations were performed before the eccentric exercise protocol (baseline), as well as immediately after and 1, 24, 48, and 72 h upon protocol completion. (Continued on next page)
* Correspondence: [email protected] 1 Laboratory of Phototherapy and Innovative Technologies in Health (LaPIT), Nove de Julho University, Rua Vergueiro, 235/249, São Paulo, SP 01504-001, Brazil 2 Postgraduate Program in Rehabilitation Sciences, Nove de Julho University, São Paulo, SP, Brazil Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licenc
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