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Infrared (810 nm) Low‐Level Laser Therapy in Experimental Model of Strain‐Induced Skeletal Muscle Injury in Rats: Effects on Functional Outcomes
Author(s) -
Ramos Luciano,
Leal Junior Ernesto Cesar Pinto,
Pallotta Rodney Capp,
Frigo Lucio,
Marcos Rodrigo Labat,
de Carvalho Maria Helena Catelli,
Bjordal Jan Magnus,
LopesMartins Rodrigo Álvaro Brandão
Publication year - 2011
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2011.01030.x
Subject(s) - medicine , strain (injury) , low level laser therapy , skeletal muscle , diclofenac , muscle damage , tibialis anterior muscle , nonsteroidal , laser therapy , anesthesia , laser , physics , optics
Muscle strains are among the most prevalent causes for athletes’ absence from sport activities. Low‐level laser therapy (LLLT) has recently emerged as a potential contender to nonsteroidal anti‐inflammatory drugs in muscle strain treatment. In this work we investigated effects of LLLT and diclofenac on functional outcomes in the acute stage after muscle strain injury in rats. Muscle strain was induced by overloading the tibialis anterior muscle of rats during anesthesia. The injured groups received either no treatment, or a single treatment with diclofenac 30 min prior to injury, or LLLT (810 nm, 100 mW) with doses of 1, 3, 6 or 9 J, at 1 h after injury. Functional outcome measures included a walking index and assessment of electrically induced muscle performance. All treatments (except 9 J LLLT) significantly improved the walking index 12 h postinjury compared with the untreated group. The 3 J group also showed a significantly better walking index than the drug group. All treatments significantly improved muscle performance at 6 and 12 h. LLLT dose of 3 J was as effective as the pharmacological agent in improving functional outcomes in the early phase after a muscle strain injury in rats.