Fig. 4
From: Predicting reactive stepping in response to perturbations by using a classification approach
Features and normalization measures used for training the classifiers. A description of the features is presented in Table 2. Normalization measure H is the subject’s body height, hcom is the height of the center of mass in the baseline pose, lfoot is the length of the foot measured from heel to toe, and wstance is the stance width measured from the head of the fifth metatarsal of the left foot to the head of the fifth metatarsal of the right foot. Fz is the vertical ground reaction force. Joint angles are positive for knee flexion and hip extension and they are defined to be zero in the baseline pose. Positions are expressed with respect to the mean position of the left and right ankle over the two seconds before the perturbation