カエル腓腹筋標本の筋収縮に対する低出力短パルスレーザー照射効果

抄録

This study clarifies the effect of low-power laser irradiation (LLI) on the muscle contraction of frog gastrocnemius and provides further insights into the possibility of clinical applications at the mammal level. When we used continuous wave LLI on the muscle contraction of frog gastrocnemius, the retardation of tension attenuation was obtained by near-infrared LLI (808 nm, 100 mW). However, we could not determine whether such retardation was based on the thermal or the photochemical effect of LLI. Since a pulsed laser has the potential to discriminate such effects, we conducted the present experiments. As a result, the pulsed LLI induced neither temperature increments nor retarded muscle fatigue. Although a thermal effect on the retardation of muscle fatigue cannot be excluded, we conclude that the photochemical action is dominant if the optical absorption and the temperature change of living tissue are considered.