O039 Agreement between MotionWatch8 and Polysomnography sleep outcomes in Menopausal Women

Abstract Introduction Polysomnography (PSG) is the gold standard for sleep measurement but is costly and can disrupt sleep. Actigraphy offers a non-invasive alternative for longer-term monitoring. This study aims to validate the MotionWatch8 device against PSG for sleep outcomes among menopausal women. Methods Sixteen healthy women aged 45-65 years with menopausal symptoms underwent four in-lab overnight PSG studies while wearing the MotionWatch8. Sleep parameters including time in bed (TIB), total sleep time (TST), sleep efficiency (SE), sleep onset latency (SOL), and wake after sleep onset (WASO) were measured. Agreements between MotionWatch8 and PSG was assessed using Bland-Altman plots. Results MotionWatch8 tended to overestimate: TIB by 1.2 minutes with limits of agreement (LOA): 6.7 to 9.2 minutes; SE by 3.5%, LOA: -11.7% and 18.7%, and significant proportional error especially for nights with SE<92%; and TST by 18.6 minutes, LOA: -56.8 to 94.0 minutes. MotionWatch8 underestimated: SOL by 11.2 minutes, LOA: -53.6 to 31.3 minutes, and a significant proportional error especially for a longer sleep latency (SOL>20minutes); and WASO by 7.4 minutes, LOA: 40.5 to 25.7 minutes. Discussion The results indicate that the MotionWatch8 provides acceptable agreement and LOA with PSG for TIB, TST and WASO; and for SOL and SE for people without significant sleep problem. The device is not recommended to be used for people with longer sleep latency and poorer sleep efficiency. While the MotionWatch is a feasible tool for large-scale sleep studies in menopausal women, it should be used with caution for these specific situations.