Hass Chris J, Gregor Robert J, Waddell Dwight E, Oliver Alanna, Smith Dagan W, Fleming Richard P, Wolf Steven L
Department of Neurology, Emory University School of Medicine, Atlanta, GA 30332, USA.
Arch Phys Med Rehabil. 2004 Oct;85(10):1593-8. doi: 10.1016/j.apmr.2004.01.020.
To determine if a program of intense Tai Chi exercise that has been shown to reduce the risk of falling in older adults improves postural control by altering the center of pressure (COP) trajectory during gait initiation.
Before-after trial.
Biomechanics research laboratory.
Twenty-eight older adults transitioning to frailty who participated in either a 48-week intervention of intense Tai Chi training or a wellness education (WE) program.
Eight Tai Chi forms emphasizing trunk rotation, weight shifting, coordination, and narrowing of lower-extremity stance were taught twice weekly. WE program participants met once a week and received lectures focused on health. Main outcome measures The COP was recorded during gait initiation both before and after the 48-week intervention by using a forceplate sampling at 300 Hz. The COP trajectory was divided into 3 periods (S1, S2, S3) by identifying 2 landmark events. Displacement and average velocity of the COP trace in the anteroposterior (x) and mediolateral (y) directions, as well as smoothness, were calculated.
Tai Chi training increased the posterior displacement of the COP during S1 and improved the smoothness of the COP during S2.
Tai Chi improved the mechanism by which forward momentum is generated and improved coordination during gait initiation, suggesting improvements in postural control.
确定一项已被证明可降低老年人跌倒风险的强化太极拳锻炼计划是否通过改变步态起始时的压力中心（COP）轨迹来改善姿势控制。
前后试验。
生物力学研究实验室。
28名向衰弱过渡的老年人，他们参加了为期48周的强化太极拳训练干预或健康教育培训（WE）计划。
每周两次教授八种强调躯干旋转、重心转移、协调性和下肢站立宽度变窄的太极拳招式。WE计划参与者每周会面一次，接受专注于健康的讲座。主要结局指标 在48周干预前后，使用300Hz采样的测力台记录步态起始时的COP。通过识别两个标志性事件将COP轨迹分为3个时期（S1、S2、S3）。计算COP轨迹在前后（x）和内外侧（y）方向上的位移和平均速度以及平滑度。
太极拳训练增加了S1期间COP的向后位移，并改善了S2期间COP的平滑度。
太极拳改善了步态起始时产生向前动量的机制并改善了协调性，表明姿势控制得到改善。
