Ademiluyi Adeolu, Liang Huaqing, Aruin Alexander S
PhD Program in Rehabilitation Science, College of Applied Health Sciences, University of Illinois Chicago, Chicago, IL, USA.
School of Physical Therapy, Marshall University, Huntington, WV, USA.
J Mot Behav. 2023;55(3):269-277. doi: 10.1080/00222895.2023.2181751. Epub 2023 Feb 21.
The objective of the study was to investigate the effect of leg supports on the anticipatory and compensatory postural adjustments of sitting subjects exposed to external perturbations in the anterior-posterior direction. Ten young participants received perturbations applied to the upper body while sitting on a stool with an anterior or posterior leg support and when using a footrest. Electromyographic activities of the trunk and leg muscles and center of pressure displacements were recorded and analyzed during the anticipatory and compensatory phases of postural control. Anticipatory activities were observed in the tibialis anterior, biceps femoris, and erector spinae muscles in the anterior leg support condition. Early onset of muscle activity was observed in the tibialis anterior, biceps femoris, rectus femoris, and erector spinae muscles in the posterior leg support condition compared to the feet support condition. Moreover, to maintain balance participants utilized co-contraction of muscles as the main mechanism of balance control in sitting regardless of the availability of the anterior or posterior leg support. There was no effect of a leg support on center of pressure displacements. The outcome of the study provides a background for future investigations of the effect of leg supports on control of balance in sitting when perturbed.
本研究的目的是调查腿部支撑对坐位受试者在前后方向受到外部扰动时的预期和补偿性姿势调整的影响。十名年轻参与者坐在带有前腿支撑或后腿支撑的凳子上以及使用脚凳时，其上身受到扰动。在姿势控制的预期和补偿阶段，记录并分析了躯干和腿部肌肉的肌电活动以及压力中心位移。在前腿支撑条件下，在胫骨前肌、股二头肌和竖脊肌中观察到预期活动。与脚支撑条件相比，在后腿支撑条件下，在胫骨前肌、股二头肌、股直肌和竖脊肌中观察到肌肉活动的早期开始。此外，无论是否有前腿支撑或后腿支撑，为了保持平衡，参与者在坐位时利用肌肉的共同收缩作为平衡控制的主要机制。腿部支撑对压力中心位移没有影响。该研究结果为未来研究腿部支撑对受扰动时坐位平衡控制的影响提供了背景。
