School of Physiotherapy and Curtin Health Innovation Research Institute, Curtin University, Perth, Western Australia.
Disabil Rehabil. 2012;34(15):1317-22. doi: 10.3109/09638288.2011.641666. Epub 2011 Dec 26.
To evaluate the measurement properties of the StepWatch(™) Activity Monitor (SAM) and ActivPAL in COPD.
Whilst wearing both monitors, participants performed walking tasks at two self-selected speeds, with and without a rollator. Steps obtained using the monitors were compared with that measured by direct observation.
Twenty participants aged 73 ± 9 years (FEV(1) = 35 ± 13% pred; 8 males) completed the study. Average speeds for the slow and normal walking tasks were 34 ± 7 m·min(-1)and 46 ± 10 m·min(-1), respectively. Agreement between steps recorded by the SAM with steps counted was similar irrespective of speed or rollator use (p = 0.63) with a mean difference and limit of agreement (LOA) of 2 steps·min(-1) and 6 steps·min(-1), respectively. Agreement for the ActivPAL was worse at slow speeds (mean difference 7 steps·min(-1); LOA 10 steps·min(-1)) compared with normal speeds (mean difference 4 steps·min(-1); LOA 5 steps·min(-1)) (p = 0.03), but was unaffected by rollator use. The change in step rate between slow and normal walking via direct observation was 12 ± 7 steps·min(-1) which was similar to that detected by the SAM (12 ± 6 steps·min(-1)) and ActivPAL (14 ± 7 steps·min(-1)).
The SAM can be used to detect steps in people who walk very slowly including those who use a rollator. Both devices were sensitive to small changes.
评估 StepWatch（™）活动监测器（SAM）和 ActivPAL 在 COPD 中的测量性能。
参与者在佩戴两个监测器的同时，以两种自我选择的速度进行步行任务，有和没有助行器。使用监测器获得的步数与直接观察测量的步数进行比较。
20 名年龄为 73±9 岁的参与者（FEV1=35±13%预计值；8 名男性）完成了研究。慢走和正常行走任务的平均速度分别为 34±7 m·min（-1）和 46±10 m·min（-1）。SAM 记录的步数与计数的步数之间的一致性与速度或助行器的使用无关（p=0.63），平均差异和界限协议（LOA）分别为 2 步·min（-1）和 6 步·min（-1）。与正常速度相比，ActivPAL 在慢速度下的一致性较差（平均差异 7 步·min（-1）；LOA 10 步·min（-1））（p=0.03），但不受助行器使用的影响。通过直接观察，从慢走到正常行走时的步速变化为 12±7 步·min（-1），与 SAM（12±6 步·min（-1））和 ActivPAL（14±7 步·min（-1））检测到的相似。
SAM 可用于检测行走非常缓慢的人（包括使用助行器的人）的步数。两种设备都对小的变化敏感。
