The mean dominant-leg joint angle changes of twelve participants following the unexpected anterior, posterior, medial, and lateral perturbations with three magnitudes (n = 12). Mean hip adduction-abduction (A), hip flexion-extension (B), knee flexion-extension (C), and ankle dorsiflexion-plantarflexion (D) angle changes following anterior and posterior perturbations; Mean hip adduction-abduction (E), hip flexion-extension (F), knee flexion-extension (G), and ankle dorsiflexion-plantarflexion (H) angle changes following medial and lateral perturbations. (Note: The red dotted line indicated the start of pulling perturbation. Add.: adduction; Abd.: abduction; Flex.: flexion; Ext.: extension; Dorsi.: dorsiflexion; Plantar.: plantarflexion. A: anterior; P: posterior; M: medial; L: lateral).