Muscle Synergies In Joystick Manipulate Task : Evaluation Of Inter-Group Variability

Background: Recently, The muscle synergy extractioned from surface electromyographic (sEMG) signals during exercise has become a common method for evaluating motor control strategies. Many studies have described the synergy of the upper extremity in various stretch and reach tasks, but few of them have analyzed the relationship between task performance together and muscle synergy. The aim of this study was to explore the activation and movement patterns of human muscles and provide theoretical support for sports science and scientific training methods . Method: Three control groups were selected: group A (professional pilot), group B (with Short flight experience) and group C (without flight experience) . All subjects perfomed the the isotonic task with the same load , the EMG and acceleration information of 10 muscles of the upper limbs were recorded. The muscle synergy effect was extracted, and the correlation between muscle synergy similarity and manipulation performance was studied. Results: Experiments and data show that:1.the structure of muscle synergy from expert group is not statistically different from that of the other two groups.2, the operation performance of the second expert group is significantly different from that of the other two groups. 3.The correlation between the muscle coordination and the operation performance of expert group is more obvious than that of the other two groups. Discussion: These findings suggest that long-term trainning can improve the performance of manipulation, although they will not alter the structure of muscle synergy, but will change the similarity of muscle synergy. The similarity of muscle synergy is negatively correlated with the error energy of operation.