Song Yuwei, Begum Momotaz, Arthanat Sajay, LaRoche Dain P
J Aging Phys Act. 2022 Feb 1;30(1):3-11. doi: 10.1123/japa.2020-0428. Epub 2021 Aug 4.
This study tested the concurrent and construct validity of smartphone accelerometry measurement of sit-to-stand (STS) performance in individuals aged 65-89 years. Normal and fast STS times were recorded by smartphone accelerometer, force plate, and video motion systems concurrently, and isokinetic knee extension power and STS whole-body power were obtained. Normal and fast speed STS times from a smartphone accelerometer agreed closely with force plate and motion system methods (mean difference = 0.04 s). Normal and fast STS times were inversely related to isokinetic knee extension power (r = -.93, p < .001 and r = -.82, p < .001, respectively) and STS whole-body power (r = -.76, p < .001 and r = -.70, p < .001, respectively). The STS time obtained from a smartphone accelerometer was equivalent to the established, precise measures of STS time and was related to lower-extremity power, making it a potentially useful metric of lower-extremity function.
本研究测试了智能手机加速度计测量65至89岁个体坐立（STS）表现的同时效度和结构效度。通过智能手机加速度计、测力板和视频运动系统同时记录正常和快速STS时间，并获取等速膝关节伸展力量和STS全身力量。智能手机加速度计测得的正常和快速速度STS时间与测力板和运动系统方法高度一致（平均差异 = 0.04秒）。正常和快速STS时间分别与等速膝关节伸展力量（r = -0.93，p < 0.001和r = -0.82，p < 0.001）以及STS全身力量（r = -0.76，p < 0.001和r = -0.70，p < 0.001）呈负相关。从智能手机加速度计获得的STS时间等同于已确立的、精确的STS时间测量值，并且与下肢力量相关，使其成为下肢功能的一个潜在有用指标。
