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In the past, joint power has most often been calculated as the product of the sagittal plane joint moment and the sagittal plane joint angular velocity, thus modelling the joint as a simple one degree of freedom (DOF) hinge. More recently three DOF power has been calculated by taking the scalar product of the net joint moment and the angular velocity of the joint, thus modelling the joint as a ball...
To examine the relative magnitude of the knee abduction-adduction moments during stair climbing, ten normal subjects (average weight 660 N, leg length 0.962 m, height 1.74 m) were studied during repeated trials of stair ascent and descent. Data were collected using a four-camera video system and two forces plates incorporated within a flight of three stairs. The inverse dynamics approach was used...
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