The purpose of this work was to verify the effects of pulsed-ultrasound intervention and continued ultrasound before an exercise on EIMD(exercise-induced muscle damage) of biceps brachii in 20's healthy males. Thirty subjects were assigned into three groups, an experimental group I(n=10) and II(n=10) in who were received the pulsed-ultrasound intervention and continued ultrasound intervention before an exercise, respectively, and a control group(n=10). In this experiment, pulsed-ultrasound was set-up by 1 ㎒, 1.5 w/㎠, 20% duty cycle, 5 minutes and continued-ultrasound was set-up by 1 ㎒, 1.5 w/㎠ 5 minutes. The effects of the pulsed-ultrasound and continued-ultrasound were evaluated by MVIC(maximal voluntary isometric contraction), PPT(pressure pain threshold), active ROM(range of motion), serum CK(creatine kinase) and LDH(lactate dehydrogenase), which were measured at pre-exercise, after 24, 48 hours. The experimental data were analyzed by using the repeated measure ANOVA.
The results of this research were as follows:
1) In the comparison of the MVIC, there were significant variations with the lapse the time in three groups(p<.001) and there was a significant interaction of time and group(p<.001). In the among group comparison, the MVIC of experimental group II was significantly larger than those of other groups(p<.001).
2) In the comparison of the PPT, there were significant variations with the lapse the time in three groups(p<.001) and there was a significant interaction of time and group(p<.001). In the among group comparison, the PPT of experimental group II was significantly larger than those of other groups(p<.01).
3) In the comparison of the active extension angle, there were significant variations with the lapse the time in three groups(p<.001) and there was a significant interaction of time and group(p<.001). In the among group comparison, the active extension angle of experimental group II was significantly smaller than those of other groups(p<.001).
4) In the comparison of the active flexion angle, there were significant variations with the lapse the time in three groups(p<.01) and there was a significant interaction of time and group(p<.001). In the among group comparison, the active flexion angle of experimental group II was significantly lager than those of other groups(p<.05).
5) In the comparison of the CK value, there were significant variations with the lapse the time in three groups(p<.001) and there was a significant interaction of time and group(p<.001). In the among group comparison, the CK value of experimental group II was significantly smaller than other groups(p<.001).
6) In the comparison of the LDH value, there was a significant variation with the lapse the time in control group(p<.001), however those of experimental group I and II were showed no statistical significances. There was a significant interaction of time and group(p<.001). In the among group comparison, the LDH value of experimental group II was significantly smaller than other two groups(p<.001).
Above results revealed that the continued ultrasound intervention before an exercise had a positive effect of muscle function after EIMD. Therefore we can consider the continued ultrasound as a considerable intervention method to prevent or reduce an exercise injury.