Actisleep bt

Self-reported sleep quality was measured using the Pittsburgh Sleep Quality Index (Buysse et al., 1989 (link)). Objective sleep measures from wrist-worn actigraphy were assessed for at least seven 24-hour periods (days and nights) using the actisleep-BT (Actigraph, Pensacola, FL), a tri-axial accelerometer. F subjects with more than 7 days/nights of objective sleep data, only the first seven 24-hour periods were included in the analyses. The data were analyzed using validat d algorithms to determine PS, TST, Bed time and Wake time (Ancoli-Israel et al., 2003 (link)). PS is the percentage of time in bed that is spent sleeping. TST is the aggregated number of minutes spent sleeping during an overnight sleep bout. Bed time and Wake time reflect the times that overnight sleep is initiated and terminated, respectively. Participants completed a nightly sleep log with bed-time and wake-times which were used to edit the actigraphy data.

We employed wrist-worn actigraphy which utilizes a device called an actisleep-BT (Actigraph, Pensacola, FL) with a sensitive tri-axial accelerometer that continuously detects movement allowing for approximation of sleep/wake patterns each night using previously validated algorithms.^{10 (link)} The wactisleep-BT has been validated against polysomnography.¹¹ Subjects wore device for up to 14 nights. Each night’s data was processed to provide an estimate of nightly total sleep time (time in minutes a subject was asleep). Our objective estimate was the average duration of all nights recorded over the two-weeks.