| Autor: |
Sarilho de Mendonça F; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil., de Tarso Camillo de Carvalho P; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil., Biasotto-Gonzalez DA; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil., Calamita SAP; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil., de Paula Gomes CAF; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil., Amorim CF; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Cidade de São Paulo, Sao Paulo, Brazil., Fumagalli MA; Department of Mechanical Engineering, Faculdade das Américas, São Paulo, Brazil., Politti F; Postgraduate Program in Rehabilitation Sciences, Physical Therapy Departament, Universidade Nove de Julho, UNINOVE, Rua Vergueiro, 235, São Paulo, SP, Brazil. fabianopolitti@gmail.com. |
| Abstrakt: |
Although low-level laser therapy (LLLT) is an important resource for the treatment of non-specific neck pain patients, the dose which presents the greatest therapeutic potential for the treatment of this pathology is still unclear. The present study aimed to evaluate the immediate effect of LLLT on the muscle fiber conduction velocity (MFCV) and electromyographic activity (EMG) of the upper trapezius (UT) muscle in healthy individuals. A total of 20 healthy subjects were enrolled in a randomized, double-blind, crossover study. Active LLLT (820 nm wavelength, 30 mW, energy total 18 J) or placebo LLLT (pLLLT) was delivered on the UT muscle. Each subject was subjected to a single session of active LLLT and pLLLT. Surface electromyography (sEMG) signal of the UT muscle was recorded during five different step contractions of shoulder elevation force (10-30% maximal voluntary contraction) pre- and post-LLLT irradiation. The values of MFCV and sEMG global amplitude (RMS G ) were used to calculate the effects of LLLT. The results showed no difference in the MFCV comparing the LLLT and pLLLT groups (F = 0.72 p = 0.39, η p 2 = 0.004). However, a significant difference was observed in the RMS G between the LLLT and pLLLT (F 1,2 = 16.66; P < 0.0001, η p 2 = 0.09). Individuals who received active LLLT presented a significant decrease in RMS G after laser application (F = 61.28; p < 0.0001, η p 2 = 0.43). In conclusion, the 820 nm LLLT, with energy total of 18 J, did not alter the MFCV but significantly reduced the sEMG signal amplitude of the upper trapezius muscle in healthy subjects to a level of up to 30% of maximal voluntary contraction. |
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