The sit-to-stand test (STS) is a simple test of function in older people that can identify people at risk of falls. The aim of this study was to develop two novel methods of evaluating performance in the STS using a low-cost RGB camera and another an instrumented chair containing load cells in the seat of the chair to detect center of pressure movements and ground reaction forces. The two systems were compared to a Kinect and a force plate. Twenty-one younger subjects were tested when performing two 5STS movements at self-selected slow and normal speeds while 16 older fallers were tested when performing one 5STS at a self-selected pace. All methods had acceptable limits of agreement with an expert for total STS time for younger subjects and older fallers, with smaller errors observed for the chair (−0.18 ± 0.17 s) and force plate (−0.19 ± 0.79 s) than for the RGB camera (−0.30 ± 0.51 s) and the Kinect (−0.38 ± 0.50 s) for older fallers. The chair had the smallest limits of agreement compared to the expert for both younger and older participants. The new device was also able to estimate movement velocity, which could be used to estimate muscle power during the STS movement. Subsequent studies will test the device against opto-electronic systems, incorporate additional sensors, and then develop predictive equations for measures of physical function.

中文翻译：

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四种评估坐姿运动的方法的比较

静坐测试（STS）是老年人的一项简单功能测试，可以识别有跌倒危险的人。这项研究的目的是开发两种使用低成本RGB相机评估STS性能的新颖方法，以及另一种仪器化椅子，该椅子在座椅上装有测力传感器，以检测压力运动和地面反作用力的中心。将这两个系统与Kinect和测力板进行了比较。当以自行选择的慢速和正常速度进行两次5STS运动时，对21名年轻受试者进行了测试，而以自行选择的速度进行5STS时，对16名年龄较大的跌倒者进行了测试。所有方法均与专家就年轻受试者和较大跌倒者的总STS时间达成了可接受的限制，并且观察到椅子（-0.18±0.17 s）和压板（-0.19±0）的误差较小。比RGB相机（-0.30±0.51 s）和Kinect（-0.38±0.50 s）（对于较大的跌倒者）高79 s）。与专家相比，无论是年轻参与者还是老年参与者，主持人的同意限制最小。新设备还能够估算运动速度，该速度可用于估算STS运动期间的肌肉力量。随后的研究将针对光电系统对该设备进行测试，并结合其他传感器，然后开发用于物理功能测量的预测方程。