Abstract
Purpose:to measure the effects of gallium-aluminum-arsenide (GaAlAs) triple-diode laser irradiation (830 nm, 90 mW) on neural transmission in the median nerve and to determine whether location of treatment influences effectiveness of treatment.Participants:42 healthy, adult volunteers, each assigned to 1 GaAlAs or placebo laser group and 1 wrist or forearm treatment group under randomized, double-blinded conditions.Method:Nerve-conduction studies were performed on each subject’s nondominant arm before and 10 minutes after treatment. Peak-to-peak amplitudes of both evoked motor and sensory action potentials (APs) were recorded.Results:A 2-way ANOVA indicated no significant differences among the amplitudes associated with placebo and GaAlAs laser irradiation. Amplitudes of sensory APs associated with location (wrist or forearm) were, however, significantly different both before and after treatment. No significant interaction was observed between laser and location after treatment, indicating that GaAlAs laser irradiation did not affect median-nerve APs.
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