anteroposterior component of ground reaction force (Fy)

anteroposterior component of ground reaction force (Fy) bidirectional sagittal-plane body force altering acceleration of the centre of gravity (CoG) during gait, i.e. backward (retrograde)-directed force (from the midpoint of double support to heel off in the stance limb, causing CoG deceleration), and forward (anterograde)-directed force (from heel off to toe off, causing CoG acceleration)
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