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This study aimed to examine the effect of linear polarized near-infrared light (PL) irradiation on the recovery of isokinetic muscle exertion and subjective fatigue sensation in muscles after strenuous exercise. Eighteen healthy college students participated in the experiment for all conditions of meridian point irradiation (MPI), femurs muscles irradiation (FMI), and no irradiation (NI). They all took isokinetic knee extension and flexion tests (IK test) before and after strenuous exercise up to exhaustion. Each subject was irradiated at the meridian point or in femurs muscles after the second IK test. The third IK test was carried out after ten-minutes rest. The effects of PL irradiation were confirmed on the recovery rate of muscle fatigue in knee extension motion with high load intensity (PT 60 d/s and TW 60 d/s : MPI, FMI> NI, p<0.05 16.2%, 13.4%>8.5%, and 16.1%, 14.1%>8.3%, respectively). Also, in flexion motion, significant differences in the recovery-degree for each condition were found, and the effect of PL irradiation was suggested. There was no difference between the effect of MPI and FMI. In addition, subjective fatigue sensation in muscles after rest decreased significantly in MPI as compared with NI (MPI 52.1%>NI : 36.6%, p<0.05). From the above, it was suggested that PL irradiation is effective on recovery in muscle fatigue after strenuous exercise regardless of irradiation conditions, MPI or FMI. (Jpn. J. Phys. Fitness Sports Med. 2000, 49 : 459-468) key word : linear polarized near-infrared light, recovery of muscle fatigue, strenuous exercise

EFFECT OF LINEAR POLARIZED NEAR-INFRARED LIGHT IRRADIATION ON THE RECOVERY OF ISOKINETIC MUSCLE EXERTION AFTER STRENUOUS EXERCISE