تاثير ليزر مادون قرمز كم توان بر روي زمان تاخير اعصاب حركتي محيطي

The effect of low-power infrared laser irradiation on peripheral motor nerve latency

During the past decade laser has become an effective means for treatment of illnesses. Low power laser has been used widely for treatment of lesions of soft tissues, arthritis, relief of pains, wound healing, etc. Although, the mechanism of its analgesic effect is not clear yet, probably nerve latency changes have some effects on pain conducting fibers. ln this experimental study, the effects of irradiation of low-power infrared laser of Ga-Al-As with wavelength of 830 nm were studied on median nerve latency of 42 healthy people of 20-30 years old. The latency of motor branch of the nerve was measured before irradiation, then left forearm in the area of the nerve was exposed to laser irradiation with energy densities of 1.5 jlcmʹ and 6 _Vein- per point. Temperature changes were controlled during the study and the latency was measured after stopping irradiation as well. Paired t-test showed a significant increase in the latency after laser exposure (P<0.001). This effect remained for a while after stopping irradiation. These findings could prepare a background for other studies using laser for treatment of some neurological disorders.