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Comparing EMG Pattern Recognition with and Without Hand and Wrist Movements

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Abstract

Electromyography (EMG) pattern recognition has been widely employed for prosthesis control. Several studies demonstrated that amputees had poorer performances of EMG pattern recognition when compared to able-bodied individuals. Several factors, such as the muscle weakness and atrophy of residual limbs, the length of residual limbs, and the decrease of the affected side's motor cortex, had been studied to improve the performance of amputees. However, there was no study on the factor that the absence of joint movements for amputees. This study aimed to investigate whether the hand and wrist joint movements had effects on the EMG pattern recognition. Ten able-bodied subjects were tested for 11 hand and wrist gestures with two different gesture modalities: hand and wrist joints unconstrained (HAWJU) and constrained (HAWJC). Time-domain (TD) features and Linear Discriminant Analysis (LDA) were employed to compare the classification performance of the two modalities. Compared to HAWJU, HAWJC significantly reduced the average Classification Accuracy (CA) across all subjects from 95.53 to 85.52%. The experimental results demonstrated that the hand and wrist joint movements had significant effects on EMG pattern recognition. The outcomes provided a new perspective to study the factors affecting EMG pattern recognition.

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Acknowledgements

The authors thank all volunteers who participated in the study. This work was supported in part by the National Natural Science Foundation of China (Grant No. 52005364, 52122501) and the State Key Laboratory of Mechanical System and Vibration (Grant No. MSV202012). This work was also supported by the Key Laboratory of Mechanism Theory and Equipment Design of the Ministry of Education (Tianjin University).

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Correspondence to Jianmin Li.

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Pan, L., Liu, K., Zhu, K. et al. Comparing EMG Pattern Recognition with and Without Hand and Wrist Movements. J Bionic Eng 19, 700–708 (2022). https://doi.org/10.1007/s42235-022-00171-7

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