Study Of Event-related Potentials And Surface Electromyography Of Taekwondo Athletes’ Motion Imagery

Motor imagery is a mental training methods widely used in training and competition, and it’s an indispensable field in sport psychology as well. As the indispensable psychological activity, motion imagery plays an important role in forming the motor skills. Form the perspective psychophysiology, this study explored the characteristics of event-related potentials and surface EMG in motor imagery process of athletes and the difference between expert athletes and ordinary people. So it can provide more objective index about motion imagery. It can also prove the Nerve-muscle Model.This study mainly used the method of expert interview, literature, data statistics and experimental method. The study of data collection is mainly through the experimental method, including the characters of event-related potentials and surface EMG. The six professional group of Taekwondo athletes, and eight college students who had never participated in professional sports training, were selected as valid subjects. The study used the2000ms video of Taekwondo tutorial as stimulus.It contains nine clips of videos.The research recorded the event-related potentials and surface EMG of the subjects when they were recalling the video.The E-prime is our software which show the video, and32leads event-related potentials System of Germany Brain Products and MegaWin6000are our collection and analysis system. The results suggested:1When the subjects were recalling the video, a significant difference existed between the professional group of Taekwondo athletes (M=1798.54±546.67ms) and non professional group without physical background students (M=3189.65±1021.32ms).The time of professional group is shorter than the college students who had never participated in professional sports training. It is closer to the video playback time.2When the subjects were recalling the video, we can analyze the primary visual area. Although two groups all have the negative waves, the volatility of the professional group is always higher than that of the professional group. The result is consistent. It shows that the primary visual area was involved in the memory.3It is divided into two parts to analyze, firstly, it is the frontal motor area, the other part is the temporal area. When the subjects were recalling the video, the volatility of the professional group is always higher than that of non-professional group. This part of regional has a relationship with movement. It is motor function area. In the temporal area, the professional group has a higher volatility than that of the professional group. It shows that when taekwondo athletes were recalling the video, they would pay more efforts than college students who had never participated in professional sports training. They also have more meaningful motor imagery content. In short, the volatility of the professional group is always higher than that of the professional group at the front of the brain areas.4The surface EMG results suggest that when Taekwondo athletes were recalling the video, muscles had corresponding EMG changes. The non-professional group had no change. That’s to say when a excellent athlete was recalling the video seriously, nerve-muscle activities will appear. This improves the Nerve-muscle Model.