Center for Neuromotor and Biomechanics Research, University of Houston, Houston, TX, USA.
Research Center, Parker University, Dallas, TX, USA.
Chiropr Man Therap. 2021 Feb 5;29(1):6. doi: 10.1186/s12998-021-00366-5.
Previous research demonstrated that manipulation of the extremities was associated with changes in multisegmental postural sway as well as improvement in a lower extremity balancing task. We were interested if these effects would extend to an upper extremity task. Our aim in this study was to investigate whether extremity manipulation could influence dual task performance where the explicit suprapostural task was balancing a water filled tube in the frontal plane.
Participants were healthy volunteers (aged 21-32 years). Upper- or lower-extremity manipulations were delivered in a participant and assessor blinded, randomized crossover, clinical trial. Postural (center of pressure) and suprapostural (tube motion) measurements in the frontal plane were made pre-post manipulation under eyes open and eyes closed conditions using a BTrackS™ force plate and a Shimmer inertial measurement unit, respectively. Pathlength, range, root mean square and sample entropy were calculated to describe each signal during the dual task performance.
There was no main effect of manipulation or vision for the suprapostural task (tube motion). However, follow-up to interaction effects indicates that roll pathlength, range and root means square of tube motion all decreased (improvement) following lower extremity manipulation with eyes open. Regarding the postural task, there was a main effect of manipulation on mediolateral center of pressure such that pathlength reduced with both upper and lower extremity manipulation with larger decreases in pathlength values following upper extremity manipulation.
Our findings show that manipulation of the extremities enhanced stability (e.g. tube stabilization and standing balance) on performance of a dual task. This furthers the argument that site-specific manipulations influence context specific motor behavior/coordination. However, as this study focused only on the immediate effects of extremity manipulation, caution is urged in generalizing these results to longer time frames until more work has been done examining the length of time these effects last.
Clinicaltrials.gov , NCT03877367 , Registered 15 March 2019. Data collection took place July 2019.
先前的研究表明,四肢的操作与多节段姿势摆动的变化以及下肢平衡任务的改善有关。我们感兴趣的是这些效果是否会扩展到上肢任务。本研究旨在探讨四肢操作是否会影响双重任务表现,即明确的超姿势任务是在前平面平衡装满水的试管。
参与者为健康志愿者(年龄 21-32 岁)。在上肢或下肢操作中,采用参与者和评估者盲法、随机交叉、临床试验。在睁眼和闭眼条件下,使用 BTrackS™力板和 Shimmer 惯性测量单元分别在前后平面上进行姿势(压力中心)和超姿势(管运动)测量。路径长度、范围、均方根和样本熵用于描述双重任务表现期间的每个信号。
超姿势任务(管运动)的操作或视觉均无主要影响。然而,对交互效应的后续分析表明,下肢睁眼操作后,管运动的滚动路径长度、范围和均方根均减小(改善)。关于姿势任务,操作对前后方向的压力中心有主要影响,即上下肢操作都使路径长度减小,上肢操作的路径长度值减小更大。
我们的研究结果表明,四肢的操作增强了双重任务的稳定性(例如管稳定和站立平衡)。这进一步证明了特定部位的操作会影响特定环境的运动行为/协调。然而,由于本研究仅关注四肢操作的即时影响,在将这些结果推广到更长的时间范围之前,应谨慎行事,直到更多的工作已经完成,研究这些效果持续的时间长度。
Clinicaltrials.gov,NCT03877367,2019 年 3 月 15 日注册。数据收集于 2019 年 7 月进行。