Accuracy and responsiveness of the stepwatch activity monitor and ActivPAL in patients with COPD when walking with and without a rollator

作者：Ng Li Whye Cindy; Jenkins Sue; Hill Kylie^*

来源：Disability and Rehabilitation, 2012, 34(15): 1317-1322.

DOI：10.3109/09638288.2011.641666

• ambulatory/instrumentation
• COPD
• motor activity

Purpose: To evaluate the measurement properties of the StepWatch (TM) Activity Monitor (SAM) and ActivPAL in COPD. Method: 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. Results: Twenty participants aged 73 +/- 9 years (FEV1 = 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)). Conclusions: 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.

• 出版日期2012