Authors:
Liming Cai
1
;
2
;
Shuhao Yan
2
;
3
;
Chuanyun Ouyang
2
;
3
;
Tianxiang Zhang
2
;
3
;
Jun Zhu
1
;
Li Chen
1
;
4
and
Hui Liu
5
Affiliations:
1
Academy for Engineering&Technology, Fudan University, Shanghai, 200433, China
;
2
Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences, Jiangsu, 215163, China
;
3
School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Suzhou, China
;
4
Department of Orthopedics, Huashan Hospital, Fudan University, Shanghai, China
;
5
Cognitive Systems Lab, University of Bremen, Bremen, Germany
Keyword(s):
Muscle Synergy Extraction, Muscle Synergy Similarity, Accuracy, Manipulate, Electromyography, EMG, sEMG.
Abstract:
Recently, Extracting the muscle synergy from surface electromyographic (sEMG) signals has become a standard method for evaluating motor control strategies during exercise. The synergy of the upper extremity in various stretch and reach tasks has been described in many studies, but few of them have analyzed the relationship between task performance and muscle synergy. This study provides an experimental device and analysis method for muscle coordination in the joystick task for the specific action of the pilots’ joystick manipulation. Eight healthy subjects performed the joystick manipulation. For upper limbs, the task content included isotonic tasks with three load levels and recorded ten muscles’ EMG and acceleration information. The muscle synergy effect was extracted and the correlation between muscle synergy similarity and manipulation performance and interaction load was studied. The experiment data showed that the manipulation performance varied under different loading conditio
ns, but did not show significant changes in synergistic muscle structure. We found significant correlations between the similarity of some synergistic muscle structures and manipulation performance. However, between single-action performance and the average of their likeness, there was no strong correlation. Through the analysis of muscle synergy, we can determine that there is a fixed muscle synergy pattern during rocker manipulation, of which the structure is independent of the rocker load level, and muscle synergy similarity was negatively correlated with manipulation performance. The results of this study help improve the ergonomics of the flight stick and propose targeted muscle training methods to improve the precision of flight maneuvering.
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