Computation of the kinematics and the minimum peak joint moments of sit-to-stand movements.
Computation of the kinematics and the minimum peak joint moments of sit-to-stand movements.
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DOI：
10.1186/1475-925x-6-26
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发表时间：
2007-07-03
影响因子：
3.9
通讯作者：
Fukashiro S
中科院分区：
文献类型：
--
作者：
Yoshioka S;Nagano A;Himeno R;Fukashiro S
从坐到站（STS）的运动需要比其他日常活动更高的肌肉力量。有许多老年人，他们从椅子上站起来时遇到困难。STS任务期间所需的肌肉力量（或关节上的负荷）由运动学（运动模式）决定。本研究的目的是评估的运动学和由此产生的人从椅子上站起来，以确定STS任务所需的最小峰值关节力矩的关节力矩。这项研究包括三个步骤。在第一步中，下肢关节角度（髋，膝，踝关节）STS运动的运动学数据进行了实验收集从人类受试者。获得了85组STS运动学数据。在第二步中，实验收集的运动学数据和人体的链接段模型用于生成超过5，000，000个计算STS运动。在第三步中，使用逆动力学方法，下肢关节力矩计算通过前面的步骤获得的所有动作。根据第三步的输出，确定髋关节、膝关节和踝关节在最小化峰值关节力矩方面的最佳运动学（运动模式）。峰值髋关节力矩范围为0.24 - 1.92 N.m/kg。膝关节峰值力矩范围为0.51 ~ 1.97 N.m/kg，踝关节峰值力矩范围为-0.11 ~1.32 N.m/kg。最佳的运动模式不同，这取决于最小化关节力矩指数选择（髋关节，膝关节或踝关节）。然而，无论选择哪种最小关节力矩指数，髋关节峰值力矩和膝关节峰值力矩之和始终约为1.53 N.m/kg。本研究最重要的发现是，髋关节和膝关节的峰值关节力矩之间的关系是互补的，这些力矩的总和需要大于1.53 N.m/kg才能成功进行STS。髋-膝关节联合值为1.5 N.m/kg或更低可能表明需要进行身体康复和/或锻炼以增加肌肉力量。
A sit-to-stand (STS) movement requires muscle strength higher than that of other daily activities. There are many elderly people, who experience difficulty when standing up from a chair. The muscle strength required (or the load on the joints) during a STS task is determined by the kinematics (movement pattern). The purpose of this study was to evaluate the kinematics and resultant joint moments of people standing up from a chair in order to determine the minimum peak joint moments required for a STS task. This study consisted of three steps. In the first step, kinematic data of lower extremity joint angles (hip, knee and ankle) during STS movements were experimentally collected from human subjects. Eighty-five sets of STS kinematic data were obtained. In the second step, the experimentally collected kinematic data and a link segment model of the human body were used to generate more than 5,000,000 computed STS movements. In the third step, using inverse dynamics method, joint moments of the lower extremity were calculated for all movements obtained through the preceding steps. From the outputs of the third step, the optimal kinematics (movement pattern) in terms of minimized peak joint moment for the hip, knee and ankle was determined. The peak hip joint moment ranged from 0.24 to 1.92 N.m/kg. The peak knee joint moment ranged from 0.51 to 1.97 N.m/kg, and the peak ankle joint moment ranged from -0.11 to 1.32 N.m/kg. The optimal movement patterns differed depending on which minimized joint moment index was selected (hip, knee or ankle). However, the sum of the peak hip joint moment and peak knee joint moment was always approximately 1.53 N.m/kg regardless of which minimized joint moment index was selected. The most important finding of this study was that the relation between the peak joint moments at the hip and knee joints was complementary and the sum of those moments needed to be greater than 1.53 N.m/kg in order to perform a successful STS. A combined hip-knee value of 1.5 N.m/kg or lower may indicate the need for physical rehabilitation and/or exercise to increase muscular force.