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Size of kinematic error affects retention of locomotor adaptation in human spinal cord injury

This study aims to investigate whether small error size during locomotor adaptation in patients with incomplete spinal cord injury leads to longer retention of aftereffect. The results suggest that introducing small errors may facilitate the retention of locomotor adaptation in patients with incomplete SCI.

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Size of kinematic error affects retention of locomotor adaptation in human spinal cord injury

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  1. Size of kinematic error affects retention of locomotor adaptation in human spinal cord injury Sheng-Che Yen, PT, PhD; Jill M. Landry, MSRS-PT; Ming Wu, PhD

  2. Aim • Determine whether small error size in locomotor adaptation in patients with incomplete spinal cord injury (SCI) leads to longer retention of aftereffect. • Relevance • Arm motor adaptation studies suggest introducing small errors during adaptation period may lead to longer retention of aftereffect than large errors, but whether this can be generalized to locomotor adaptation is unclear.

  3. Method • 12 subjects with incomplete SCI walked on treadmill. • Light-, medium, and heavy-resistance loads were applied to right ankle to perturb leg swing.

  4. Results • Subjects tended to make larger errors when resistance-load condition was greater. • Following resistance load release, subjects showed aftereffect of increased stride length. • Aftereffect was retained longer in medium-resistance load condition than in heavy- and light-resistance load conditions.

  5. Conclusion • Patient-specific resistance load may be needed to facilitate retention of locomotor adaptation in patients with incomplete SCI.

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