Do ActiGraph™ activity monitors measure sedentary behaviour in people with Parkinson's disease; a concurrent validity study.
(2016) Do ActiGraph™ activity monitors measure sedentary behaviour in people with Parkinson's disease; a concurrent validity study., no. 18.
Background: Parkinson's disease is a degenerative neurological disease that affects approximately 127,000 people within the UK. The common side effects of slowness of movement, rigidity and tremor along with tiredness and depression can lead to people with Parkinson's disease (pwPD) leading a less active lifestyle. Inactivity in pwPD has been shown to have a negative effect on the motor decline and it is therefore important to have a valid means of monitoring sedentary activity in pwPD. Objective: to investigate the concurrent validity of ActiGraph™ GT3X hip and wrist monitors in pwPD. Participants: 9 participants (7 male, 2 female) with early stage PD (Hoehn & Yahr ≤3) `(MMSE ≥24) recruited from the Parkinson's UK Group. Methods: 9 pwPD wore the ActiGraph™ GT3X hip and wrist monitors for 7 days noting the time worn and removed on a simple diary log. The monitor's data were then downloaded into ActiLife V6.12.0 with their diary logs to remove non-wear time to give total sedentary activity per day (minutes). Results: Daily: spearman correlation (rs=0.872, n=9, p= 0.002). Bland-altman upper limits of agreement are 353.33 and the lower is 73.44. Bias is 213.39 minutes (±71.4). Mean daily: pearson correlation (rs=0.872, n=9, p= 0.002). Bland-altman upper limits of agreement are 353.33, lower 73.44. Bias is 213.39 minutes (±71.4). Conclusion: the ActiGraph™ GT3X hip and wrist monitors are not concurrently valid when measuring sedentary behaviour of pwPD with the hip location registering higher sedentary activity in comparison to the wrist.