1. Date of download: 11/5/2017
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From: Comparative Analysis of Methods for Estimating Arm Segment Parameters and Joint Torques From Inverse Dynamics
J Biomech Eng. 2011;133(3): doi: /
Figure Legend:
(a) Position of Optotrak® active markers: (1) index finger tip, (2) styloid process of radius, (3) head of ulna, (4) lateral epicodyle of humerus, (5) deltoid tuberosity, (6) greater tubercle of humerus, (7) acromion, and (8) manubrium of sternum. The shape of the table was such as to restrain the movement of the subjects’ torso, minimizing the translation of the shoulder centroid (xs,ys). (b) Variables used in the floating base double-pendulum planar model. X denotes the medial-lateral direction and Y the dorso-ventral direction. An Optotrak® system was used to measure the constants l1 and l2, the coordinates of the shoulder centroid (xs,ys), and the angles θ1 and θ2 during the movement. The positions of r1 and r2 were calculated for each estimation method.