This study aimed to determine the kinetic effects of using unilateral shelf bar, vertical grab bar (GB), and horizontal GB during sit-to-stand (STS) in young and elderly subjects. Twenty young adults aged 20–40 years and eighteen healthy elderly people aged ≥ 65 years old were recruited. The subjects performed STS with and without using the three types of bars. Bar reaction force (BRF) and maximum power (MP) defined as the maximal product calculated by multiplying the GRF and the velocity of the center of mass in each direction were measured using three-dimensional motion analysis, two load sensors of GB, and four force plates. The use of the shelf bar generated a significantly larger BRF in the vertical direction than the other bars (p < 0.05) and lower MP in the vertical direction than the horizontal bar (p < 0.05) and no bar (p < 0.05). In the younger subjects, only the use of the vertical bar generated a significantly larger BRF (p < 0.05) and negative MP (p < 0.05) in the forward direction than those in elderly subjects. The use of the shelf bar may assist the decreased MP in the vertical direction during STS in elderly people, resulting in decrease of failed STS in daily living. In contrast, the use of the vertical bar in the elderly may not generate sufficient BRF in the forward direction because of lack of eccentric control in the whole body in the forward direction during STS.

这项研究旨在确定在年轻人和老年人中，从坐到站（STS）期间使用单侧搁杆，垂直抓杆（GB）和水平GB的动力学效果。招募了20名20至40岁的年轻人和18名年龄≥65岁的健康老人。受试者在使用和不使用三种类型的钢筋的情况下均进行了STS。钢筋反作用力（BRF）和最大功率（MP）定义为通过将GRF与质心在每个方向上的速度相乘得出的最大乘积，使用三维运动分析，两个GB负载传感器和四个测力板。货架条的使用在垂直方向上产生的BRF显着大于其他条（p <0.05），在垂直方向上产生的MP低于水平条（p <0.05）和无条（p <0.05）。在年轻受试者中，仅使用竖线会比老年受试者产生更大的向前BRF（p <0.05）和负MP（p <0.05）。搁板条的使用可以帮助老年人进行STS期间垂直方向的MP降低，从而导致日常生活中失败的STS减少。相反，由于老年人在STS期间在向前方向上缺乏对整个身体的偏心控制，因此在老年人中使用垂直杆可能无法在向前方向上产生足够的BRF。搁板条的使用可以帮助老年人进行STS期间垂直方向的MP降低，从而导致日常生活中失败的STS减少。相反，由于老年人在STS期间在向前方向上缺乏对整个身体的偏心控制，因此在老年人中使用垂直杆可能无法在向前方向上产生足够的BRF。搁板条的使用可以帮助老年人进行STS期间垂直方向的MP降低，从而导致日常生活中失败的STS减少。相反，由于老年人在STS期间在向前方向上缺乏对整个身体的偏心控制，因此在老年人中使用垂直杆可能无法在向前方向上产生足够的BRF。