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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effects of low-level laser therapy after nerve reconstruction in rat denervated soleus muscle adaptation

Texto completo
Silva-Couto, Marcela A. [1] ; Gigo-Benato, Davilene [1] ; Tim, Carla R. [1] ; Parizotto, Nivaldo A. [1] ; Salvini, Tania F. [1] ; Russo, Thiago L. [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos UFSCar, Phys Therapy Dept, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: BRAZILIAN JOURNAL OF PHYSICAL THERAPY; v. 16, n. 4, p. 320-327, JUL-AUG 2012.
Citações Web of Science: 5

Background: Peripheral nerve injury (PNI) rehabilitation remains a challenge for physical therapists because PNI effects are very disabling. Low-level laser therapy (LLLT) has been described as a physical resource that is able to influence enzymes called metallopeptidases (MMPs) associated with extracellular matrix (ECM) turnover, thus accelerating neuromuscular recovery after nerve crush injuries. However, the effects of LLLT in the treatment of severe nerve injuries and denervated slow-twitch muscles are still inconclusive. Objectives: The aim of this study was to evaluate the effects of different wavelengths and energy densities of LLLT irradiation, applied to a severe nerve injury after reconstruction, on denervated slow-twitch skeletal muscle adaptation. Method: Rats were submitted to a neurotmesis of the sciatic nerve followed by end-to-end neurorrhaphy. They received transcutaneous LLLT irradiation at the lesion site. The LLLT parameters were: wavelengths -660 or 780 nm; energy densities -10, 60 or 120 J/cm(2); power - 40 mW; spot - 4 mm(2). Sciatic functional index (SFI), histological, morphometric, and zymographic analyses were performed. One-way ANOVA followed by Tukey's test was used (p <= 0.05). Results: An atrophic pattern of muscle fibers was observed in all injured groups. The MMP activity in the soleus muscle reached normal levels. On the other hand, SFI remained below normality after PNI, indicating incapacity. No difference was found among PNI groups submitted or not to LLLT in any variable. Conclusions: LLLT applied to the nerve post-reconstruction was ineffective in delaying degenerative changes to the slow-twitch denervated muscles and in functional recovery in rats. New studies on recovery of denervated slow-twitch muscle are necessary to support clinical practice. (AU)

Processo FAPESP: 10/11795-6 - Avaliação da ação do laser de baixa potência sobre a regeneração neuromuscular em ratos com axonotmese
Beneficiário:Thiago Luiz de Russo
Linha de fomento: Auxílio à Pesquisa - Regular