Figure 1
From: Effects of the type and direction of support surface perturbation on postural responses
EMG responses in four types of perturbation. Averaged EMG responses of three trials of ten muscles for one representative subject in response to four types of perturbation. The vertical dotted line indicates the beginning of platform movement. NK EXT, cervical paraspinae; NK FLX, neck flexor; T EXT, thoracic paraspinae; PEC, pectoralis major; L EXT, lumbar paraspinae; ABD R, abdominal rectus; BF, biceps femoris; RF, rectus femoris; MG, medial gastrocnemius; TA, tibialis anterior; BT, backward translation, FT, forward translation, DR, toe down rotation; UR, toe up rotation.