Muscle fiber conduction velocity and EMG amplitude of the upper trapezius muscle in healthy subjects after low-level laser irradiation: a randomized, double-blind, placebo-controlled, crossover study

• Published in: Lasers in medical science 2018-05, Vol.33 (4), p.737-744
• Main Authors: Sarilho de Mendonça, Fabiana, de Tarso Camillo de Carvalho, Paulo, Biasotto-Gonzalez, Daniela Aparecida, Calamita, Simone Aparecida Penimpedo, de Paula Gomes, Cid André Fidelis, Amorim, César Ferreira, Fumagalli, Marco Antônio, Politti, Fabiano
• Format: Article
• Language: English
• Subjects: Cervical Vertebrae - radiation effects; Cross-Over Studies; Dentistry; Double-Blind Method; Double-blind studies; Electromyography; Female; Healthy Volunteers; Humans; Irradiation; Laser applications; Lasers; Levels; Low-Level Light Therapy - methods; Male; Medicine; Medicine & Public Health; Muscle Fibers, Skeletal - physiology; Muscle Fibers, Skeletal - radiation effects; Muscles; Neck; Optical Devices; Optics; Original Article; Pain; Photonics; Placebos; Quantum Optics; Randomization; Shoulder; Trapezius muscle; Velocity; Young Adult
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-017-2404-6

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