School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan.
Department of Physical Therapy, College of Medicine, National Cheng Kung University, Tainan, Taiwan; Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
Arch Phys Med Rehabil. 2018 Aug;99(8):1540-1546.e2. doi: 10.1016/j.apmr.2018.02.013. Epub 2018 Mar 31.
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.
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).
University research laboratory.
Individuals (N=16) with early-stage PD who had no clinically observed postural symptoms.
Not applicable.
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.
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.
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.
研究任务优先级对早期帕金森病（PD）患者无明显姿势症状的姿势-上肢双重任务表现的影响。
横断面研究。参与者在移动平台上站立时执行力量匹配任务，并被指示将注意力集中在姿势任务（姿势优先策略）或力量匹配任务（姿势第二策略）上。
大学研究实验室。
无明显姿势症状的早期 PD 患者（N=16）。
不适用。
姿势错误、姿势近似熵（ApEn）、力错误和反应时间（RT）的双重任务变化（DTC；单任务和双重任务表现之间的百分比变化）。正的 DTC 值表示在双重任务条件下与单任务条件相比，姿势错误、姿势 ApEn、力错误和力 RT 更高。
与姿势优先策略相比，姿势第二策略与较小的姿势错误和力错误的 DTC 以及较大的姿势 ApEn 的 DTC 相关。相比之下，在姿势第二策略下，力 RT 的 DTC 更大。
与典型建议相反，我们的结果表明，对于无明显姿势症状的早期 PD 患者，姿势第二策略可能是一种有效的双重任务策略，以减少双重任务对表现的负面影响，并促进姿势的自动性。
