Human performs bipedal gait with synchronized arm swing. Apart from the observation that arm
movement during gait is the outcome of a mechanical and energetic optimization, the synergetic upper and
lower limb movement during gait is a neutrally coordinated motor output, that is, the interlimb movement is
neutrally coupled. Patients with injuries to the central nervous system demonstrate the interlimb neural coupling.
Researches on central pattern generator and the reflex studies reveal that the interlimb neural coupling is a
quadrupedal heritage. Based on the theory of the interlimb neural coupling, both the upper and lower limbs
should be practiced synchronously during regular gait training to promote walking rehabilitation for patients with
gait disorders. Further development of a gait robotic system with synchronized arm swing is required to test the
clinical application of the neural coupling in gait restoration.
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