Abstract
s / Gait & Posture 39S (2014) S1–S141 S121 fast (blue) side and the decrease in stride length of the same (slow; red) side. Towards the end of the split condition, arm amplitude on the slow (red) side gradually decreased, in parallel with a slow increase of arm swing amplitude and stride length on the fast (blue) side. Discussion and conclusions: A detailed analysis of arm swing amplitude during split-belt gait revealed two novel findings. First, during the initial split condition, the arm on the slow side showed a marked increase in amplitude. It is tempting to relate this to the simultaneous fast increase in leg amplitude of the contralateral leg, possibly to neutralize angular momentum [3]. A second striking feature was the gradual divergence of arm swing amplitudes on the two sides in the second half of the split condition. Since these changes occur in parallel with the slow increase in stride length on the fast side it is suggested that these changes in the arms represent a second type of compensation (perhaps related to instability).
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