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An automatic method to identify human alternative movements: application to the ingress movements

Ait El Menceur M. O., Pudlo P., Debril J. F., Lepoutre F. X.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 3

64-69

Alternative movement techniques identification is primordial in many studies of biology, medicine and ergonomics. Few studies in literature propose quantitative techniques to achieve this purpose. Park et al. [ W. Park, B.J. Martin, S. Choe, D.B. Chaffin, M.P. Reed, "Representing and identifying alternative movement techniques for goal-directed manual tasks", Journal of Biomechanics, vol. 38 , 2005, pp. 519-527] proposed a biomechanical index based technique named JCV. This method finds its limits when dealing with three-dimensional complex movements. In the present study we propose a modification of this method so that it will be applied to complex movements. We consider a non-habitual end effector (Midpoint between Hips). We obtain other indices, 3BJCV, to which a non-supervised clustering technique is applied. We have applied our method to the ingress movements of 37 young and elderly subjects with or without prosthesis entering in a minivan vehicle. Our method allows the identification of the two big classes of ingress movements observed by Ait El Menceur et al. [M-O. Ait El Menceur, P. Pudlo, P. Gorce, A. Thévenon, and F-X, Lepoutre, "Alternative Movement Identification in the Automobile Ingress and Egress for Young and Elderly Population with or without Prostheses", International Journal of Industrial Ergonomics, vol. 38, 2008, pp. 1078-1087].