Journal
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION
Volume 101, Issue 7, Pages 1212-1219Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.apmr.2020.02.014
Keywords
Attention; Electromyography; Parkinson disease; Postural balance; Rehabilitation
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Funding
- Centre for Parkinson and Movement Disorders at National Taiwan University Hospital
- Ministry of Science and Technology, R.O.C. Taiwan [MOST 106-2314B-002-045-MY2]
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Objective: To investigate the effect of task prioritization on dual-task control in Parkinson disease (PD) associated with different postural impairments. Design: Cross-sectional study. Participants were instructed to keep 2 interlocking rings apart and maintain balance in a tandem stance. Attention was focused on either stance stability (posture-focus strategy) or the interlocking rings (supraposture-focus strategy). Setting: University research laboratory. Participants: Fifteen patients with PD and less postural impairment and 15 patients with PD and more postural impairment (N=30). Interventions: Not applicable. Main Outcome Measures: Postural sway, postural determinism (%DET), ankle co-contraction, and ring-touching time. Results: In the less-impairment group, the supraposture-focus strategy provided smaller postural sway and postural %DET compared with the posture-focus strategy. In the more-impairment group, task prioritization showed lower effect on both postural sway and postural %DET. The supraposture-focus strategy led to less ankle co-contraction than the posture-focus strategy in the more-impairment group, but task prioritization did not affect ankle co-contraction in the less-impairment group. In both groups, the supraposture-focus strategy led to less ring-touching time than the posture-focus strategy. Conclusions: The supraposture-focus strategy provided better dual-task control than the posture-focus strategy in both PD groups. In the less-impairment group, the supraposture-focus strategy enhanced postural automaticity and postural stability. In the more-impairment group, the supraposture-focus strategy reduced ankle stiffness, owing to reduced muscle co-contraction. (C) 2020 by the American Congress of Rehabilitation Medicine
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