Error variability affects the after effects following motor learning of lateral balance control during walking in people with spinal cord injury

Autor:	David Chen, Ming Wu, William Z. Rymer, Chao-Jung Hsu, Weena Dee, Jui-Te Lin
Rok vydání:	2019
Předmět:	Adult Male medicine.medical_specialty Walking Article Learning effect Young Adult 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Humans Learning Medicine Treadmill Muscle Skeletal Postural Balance Spinal cord injury Spinal Cord Injuries Aged 030304 developmental biology Balance (ability) Leg 0303 health sciences Electromyography business.industry General Neuroscience Neurological Rehabilitation Robotics Middle Aged medicine.disease Adaptation Physiological Biomechanical Phenomena Treatment Outcome Robotic systems After effect Therapy Computer-Assisted Female Heel contact business Motor learning 030217 neurology & neurosurgery
Zdroj:	Eur J Neurosci
ISSN:	1460-9568 0953-816X
DOI:	10.1111/ejn.14478
Popis:	People with incomplete spinal cord injury (iSCI) usually show impairments in lateral balance control during walking. Effective interventions for improving balance control are still lacking, probably due to limited understanding of motor learning mechanisms. The objective of this study was to determine how error size and error variability impact the motor learning of lateral balance control during walking in people with iSCI. Fifteen people with iSCI were recruited. A controlled assistance force was applied to the pelvis in the medial-lateral direction using a customized cable-driven robotic system. Participants were tested using 3 conditions, including abrupt, gradual, and varied forces. In each condition, participants walked on a treadmill with no force for 1 minute (baseline), with force for 9 minutes (adaptation), and then with no force for additional 2 minutes (post-adaptation). The margin of stability at heel contact (MoS_HC) and minimum value moment (MoS_Min) were calculated to compare the learning effect across different conditions. Electromyogram signals from the weaker leg were also collected. Participants showed an increase in MoS_Min (after effect) following force release during the post-adaptation period for all three conditions. Participants showed a faster adaptation and a shorter lasting of after effect in MoS_Min for the varied condition in comparison with the gradual and abrupt force conditions. Increased error variability may facilitate motor learning in lateral balance control during walking in people with iSCI, although a faster learning may induce a shorter lasting of after effect. Error size did not show an impact on the lasting of after effect.
Databáze:	OpenAIRE
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