Abstract
The characteristics of long-latency reflexes (LLR) with increasing the electrical stimulus were examined. Five healthy subjects (4 males and 1 female), 10 upper extremities, with a mean age of 26.2 (24-31) years participated in the study. LLR were recorded from the opponens pollicis muscle under the following conditions of stimulus intensity: 20, 40, 60, 80 and 100% of the stimulus intensity for the M-wave. With an increase in stimulus intensity, persistence of LLR, duration, the amplitude ratio of LLR/M and the area ratio of LLR/M tended to be gradually decreased, being significantly lower (p<0.05 or p<0.01) at the 60, 80 and 100% intensity than at the 40%. The onset latency of LLR tended to be gradually prolonged. These findings suggest that LLR is inhibited and becomes clear with the increase in stimulus intensity in healthy subjects.
