Department of Health and Kinesiology, Georgia Southern University, Statesboro, GA 30460, USA.
J Biomech. 2009 Oct 16;42(14):2318-22. doi: 10.1016/j.jbiomech.2009.06.023. Epub 2009 Aug 5.
Sit-to-walk (STW) is a common functional and transitional task which challenges an individual's postural control systems. As aging is associated with an increased risk of falls during transitional movements, we biomechanically investigated the STW movement task in 12 healthy young and 12 healthy elderly individuals. Performance was evaluated utilizing motion analysis and two force plates. The principal finding of this study was the impaired performance of the healthy older adults. The older adults generated significantly less momentum prior to rising (p=0.011) and further delayed (p<0.001) the initiation of gait until standing more upright (p=0.036). The young adults successfully merged the component tasks shortly after seat-off and displayed significantly greater step length (p<0.001), step velocity (p<0.001), and tolerated greater separation of the center of pressure and center of mass at the end single support phase of the initial step (p=0.001). While the young adults fluidly merged the standing and walking task components, the older adults displayed a conservative movement performance during the STW task thereby limiting threats to their postural stability.
从坐到站（STW）是一种常见的功能性和过渡性任务，挑战着个体的姿势控制系统。由于随着年龄的增长，过渡性运动中跌倒的风险增加，我们从生物力学角度研究了 12 名健康的年轻个体和 12 名健康的老年个体的 STW 运动任务。表现评估利用运动分析和两个测力板进行。本研究的主要发现是健康老年人的表现受损。老年人在起身前产生的动量明显减少（p=0.011），并且在站立更直立时（p=0.036）进一步延迟（p<0.001）开始行走。年轻人在座椅离开后不久成功地融合了各个组成任务，并且表现出明显更大的步长（p<0.001）、步速（p<0.001），并且在初始步的单支撑阶段末端，能够承受更大的重心和质心分离（p=0.001）。虽然年轻人流畅地融合了站立和行走任务的组成部分，但老年人在 STW 任务中表现出保守的运动表现，从而限制了对其姿势稳定性的威胁。
