Singapore Institute of Technology

File(s) stored somewhere else

Please note: Linked content is NOT stored on Singapore Institute of Technology and we can't guarantee its availability, quality, security or accept any liability.

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

journal contribution
posted on 2023-10-30, 08:49 authored by Li Whye Cindy NgLi Whye Cindy Ng, Sue Jenkins, Kylie Hill

Purpose: To evaluate the measurement properties of the StepWatch 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−1and 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.


Journal/Conference/Book title

Disability and Rehabilitation

Publication date



  • Published

Usage metrics



    Ref. manager