Lu Hsuan-Lun, Lu Tung-Wu, Lin Hsiu-Chen, Hsieh Hong-Jung, Chan Wing P
Institute of Biomedical Engineering, National Taiwan University, Taiwan, ROC.
Institute of Biomedical Engineering, National Taiwan University, Taiwan, ROC; Department of Orthopaedic Surgery, School of Medicine, National Taiwan University, Taiwan, ROC.
Gait Posture. 2017 Jan;51:109-115. doi: 10.1016/j.gaitpost.2016.09.030. Epub 2016 Sep 29.
Treadmills are often used in clinical settings to improve walking balance control in patients with gait impairments. However, knowledge of the effects of belt speed on balance control remains incomplete. The current study determined such effects in terms of inclination angles (IA) and the rate of change (RCIA) of the center of mass (COM) motion relative to the center of pressure (COP) in twelve healthy adults at five belt speeds, including the subjects' preferred walking speed (PWS), as measured using a motion capture system and an instrumented treadmill. The values of IAs and RCIAs at key gait events and their average values over single-limb support (DLS) and double-limb support (DLS) were compared between speeds using one-way repeated measures analysis of variances. While the COM-COP controls were different between SLS and DLS, they were inter-related to form an integrated whole. Among the belt speeds, the range of frontal IA during SLS was smallest at the PWS (p<0.05). With increasing speed, most variables of the sagittal IAs and RCIAs, and of the frontal RCIAs during DLS showed a linearly increasing trend (p<0.001). A linearly decreasing trend was found in the frontal IA at toe-off and in the average frontal RCIA during SLS (p<0.05). The PWS appeared to be the best compromise between frontal stability during SLS and smooth weight-transfer during DLS. The current results provide useful baseline data for selecting speeds according to training needs, and may be helpful for developing protocols for gait retraining for patients with gait impairment.
跑步机常用于临床环境，以改善步态受损患者的步行平衡控制。然而，关于皮带速度对平衡控制影响的知识仍不完整。本研究通过运动捕捉系统和装有仪器的跑步机，测定了12名健康成年人在五种皮带速度下，包括受试者的偏好步行速度（PWS），相对于压力中心（COP）的倾斜角度（IA）和质心（COM）运动变化率（RCIA）的影响。使用单向重复测量方差分析比较了不同速度下关键步态事件的IA和RCIA值及其在单支撑（SLS）和双支撑（DLS）阶段的平均值。虽然SLS和DLS之间的COM-COP控制不同，但它们相互关联形成一个整体。在皮带速度中，SLS期间额状面IA的范围在PWS时最小（p<0.05）。随着速度增加，矢状面IA和RCIA以及DLS期间额状面RCIA的大多数变量呈线性增加趋势（p<0.001）。在离地时的额状面IA和SLS期间的平均额状面RCIA中发现线性下降趋势（p<0.05）。PWS似乎是SLS期间额状面稳定性和DLS期间平稳体重转移之间的最佳折衷。目前的结果为根据训练需求选择速度提供了有用的基线数据，可能有助于为步态受损患者制定步态再训练方案。
