Feature Evaluation and Pattern Recognition of Lower Limb Muscle EMG during Postural Balance Control


Article Preview

We recognized EMG signal patterns of lower limb muscles by using neural networks and performed feature evaluation during the recovery of postural balance of human body. Surface electrodes were attached to lower limb and EMG signals were collected during the balance recovery process from a perturbation without permitting compensatory stepping. A waist pulling system was used to apply transient perturbations in five horizontal directions. The EMG signals of fifty repetitions of five motions were analyzed for ten subjects. Twenty features were extracted from EMG signals of one event. Feature evaluation was also performed by using DB (Davies-Bouldin) index. By using neural networks, EMG signals were classified into five categories, such as forward perturbation, backward perturbation, lateral perturbation and two oblique perturbations. As results, motions were recognized with mean success rates of 75 percent. With the neural networks classifier of this study, the EMG patterns of lower limb muscles during the recovery of postural balance can be classified with high accuracy of recognition.



Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim




H. K. Choi et al., "Feature Evaluation and Pattern Recognition of Lower Limb Muscle EMG during Postural Balance Control", Key Engineering Materials, Vols. 326-328, pp. 867-870, 2006

Online since:

December 2006




[1] P. Kannus, J. Parkkari, S. Koskinen, S. Niemi, M. Palvanen, M. Jarvinen, and I. Vuori: JAMA Vol. 281 (1999) pp.1895-1899.

[2] H. Kawamoto and Y. Sankai: Man and Cybernetics (2002) pp.3877-3882.

[3] M. Maranzana Figini and M. Fabbro: Electroencephalography and clinical neurophysiology, Vol. 52 No. 4 (1981) pp.378-381.

DOI: https://doi.org/10.1016/0013-4694(81)90068-7

[4] C. F. Runge, C. L. Shupert, F. B. Horak, and F. E. Zajac: Gait and Posure, Vol. 10 (1999) pp.161-170.

[5] Y. C. Pai, M. W. Rogers, J. Patton, T. D. Cain and T. A. Hanke: J. Biomechanics, Vol. 31 (1998) pp.1111-1118.

[6] D. Graupe, J. Magnussen, and A.B. Aloysius: IEEE Trans. On Automatic control, vol. Ac-23, no. 4 (1978).

[7] F.K. Michael, A.P. Philip and N.S. Robert: IEEE Trans. On Biomedical Engineering, Vol. 37, No. 3 (1990).

[8] O. Fukuda and T. Tsuji: IEEE Transactions on Robotics and Automation, Vol. 19 No. 2 (2003) pp.210-222.

[9] H.K. Choi and J.H. Jeong: Key Engineering Materials (Submitted).

[10] D.L. Davies and D.W. Bouldin: IEEE Trans. Pattern Anal. Machine Intell., Vol. PAMI-1 (1979) pp.224-227 � ��� ��� ��� ��� ��� ��� �� ��.