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Improving Dual-Task Control With a Posture-Second Strategy in Early-Stage Parkinson Disease

Published:March 30, 2018DOI:https://doi.org/10.1016/j.apmr.2018.02.013

      Abstract

      Objective

      To examine the task prioritization effects on postural-suprapostural dual-task performance in patients with early-stage Parkinson disease (PD) without clinically observed postural symptoms.

      Design

      Cross-sectional study. Participants performed a force-matching task while standing on a mobile platform, and were instructed to focus their attention on either the postural task (posture-first strategy) or the force-matching task (posture-second strategy).

      Setting

      University research laboratory.

      Participants

      Individuals (N=16) with early-stage PD who had no clinically observed postural symptoms.

      Interventions

      Not applicable.

      Main Outcome Measures

      Dual-task change (DTC; percent change between single-task and dual-task performance) of posture error, posture approximate entropy (ApEn), force error, and reaction time (RT). Positive DTC values indicate higher postural error, posture ApEn, force error, and force RT during dual-task conditions compared with single-task conditions.

      Results

      Compared with the posture-first strategy, the posture-second strategy was associated with smaller DTC of posture error and force error, and greater DTC of posture ApEn. In contrast, greater DTC of force RT was observed under the posture-second strategy.

      Conclusions

      Contrary to typical recommendations, our results suggest that the posture-second strategy may be an effective dual-task strategy in patients with early-stage PD who have no clinically observed postural symptoms in order to reduce the negative effect of dual tasking on performance and facilitate postural automaticity.

      Keywords

      List of abbreviations:

      ApEn (approximate entropy), DTC (dual-task change), PD (Parkinson disease), RT (reaction time)
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