College of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin, China.
Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, Tianjin, China.
Medicine (Baltimore). 2023 Mar 10;102(10):e33184. doi: 10.1097/MD.0000000000033184.
Sit-to-stand (STS) is considered the most common functional activities in daily life and the basis for other activities. The elderly and patients with lower limb disorders could not complete the STS motion very well due to limb pain and muscle weakness. Physiotherapist find that specific STS transfer strategies can make patients more easily to complete this task. However, few researchers pay attention to the effect of initial foot angle (IFA) on STS motion. Twenty-six healthy subjects were randomly selected to perform STS transfer experiment. The motion characteristic parameters of subjects under 4 different IFAs (nature, 0°, 15°, and 30°) were obtained, including the percentage of duration in each phase, the velocity of joints, rotation angle and angular velocity of joints (shoulder, hip and knee), center of gravity (COG) trajectory. the change of plantar pressure parameters, and dynamic margin of stability. By comparing the motion characteristic parameters obtained under different IFAs and carrying out statistical analysis, the influence of different IFAs on body kinematics and dynamics during STS task was further explored. The kinematic parameters obtained under different IFAs are significantly different. The percentage of duration in each phase of the STS transfer was different with different IFA, the main differences were in phase I and phase II. The phase I of U15 took 24.5% T, while phase I of N, U0 and U30 took about 20% T, and the maximum difference was (U15-U0) 5.4%. The phase II of U15 took the least time, about 30.8% T. When the IFA is nature (N) and 15°(U15), the trajectories of COG are basically in coincidence; when the IFA is 0°(U0) and 30°(U30), the displacement of COG in anterior-posterior direction is larger. The larger the IFA, the smaller the plantar pressure parameter. When the IFA is 15°, the COG is close to the center of limits of stability, which can provide a better stability. This paper summarizes the influence under 4 different experimental conditions of IFAs on STS transfer, so as to provide a starting point and bases for clinicians to develop rehabilitation training protocols and STS motion strategies for patient.
从坐到站（STS）被认为是日常生活中最常见的功能活动，也是其他活动的基础。老年人和下肢功能障碍的患者由于肢体疼痛和肌肉无力，无法很好地完成 STS 运动。物理治疗师发现，特定的 STS 转移策略可以使患者更容易完成这项任务。然而，很少有研究人员关注初始脚角度（IFA）对 STS 运动的影响。随机选择了 26 名健康受试者进行 STS 转移实验。在 4 种不同 IFA（自然、0°、15°和 30°）下，获得了受试者的运动特征参数，包括各阶段的持续时间百分比、关节速度、关节旋转角度和角速度（肩部、臀部和膝盖）、重心（COG）轨迹。足底压力参数的变化和动态度量的稳定性。通过比较不同 IFA 下获得的运动特征参数并进行统计分析，进一步探讨了不同 IFA 对 STS 任务中身体运动学和动力学的影响。在不同 IFA 下获得的运动学参数有显著差异。STS 转移的各阶段持续时间百分比随 IFA 不同而不同，主要差异在第一阶段和第二阶段。U15 的第一阶段持续时间占 T 的 24.5%，而 N、U0 和 U30 的第一阶段持续时间约占 T 的 20%，最大差值为（U15-U0）5.4%。U15 的第二阶段持续时间最短，约占 T 的 30.8%。当 IFA 为自然（N）和 15°（U15）时，COG 轨迹基本重合；当 IFA 为 0°（U0）和 30°（U30）时，COG 在前后方向上的位移较大。IFA 越大，足底压力参数越小。当 IFA 为 15°时，COG 接近稳定极限的中心，可提供更好的稳定性。本文总结了 4 种不同实验条件下 IFA 对 STS 转移的影响，为临床医生为患者制定康复训练方案和 STS 运动策略提供了起点和依据。
