Motion and Time Sequences of Roll-Overs During Sleep for Development of Self-Helped Roll-Over Movements: A Preliminary Study

摘要

This study aimed to identify the motion sequences and time-flow of roll-overs during sleep in women to develop a self-helped roll-over maneuver for elderly patients. Shifts from deeper sleep stages to lighter stages leading to arousal occur at roll-over-onset. Quick re-falling-asleep after completion may aid peaceful sleep continuation. Motion sequences of six women aged 43-65 years were examined at a sleep laboratory using polysomnography and infrared video. Relationships among phase I (before roll-over onset), II (roll-over movements), and III (roll-over end to re-falling-asleep onset) were determined. Mean total sleep time was 6.72±0.77 h, with over 80% sleep efficiency. Among 12 patterns examined, only supine-to-left and supine-to-right lateral roll-overs were classified: type A, sliding waist with pause (n=11, sleep); B,sliding waist without pause (n=56, sleep and arousal）； and C,without sliding waist or pause (n=1, arousal). Time spent in phase I and III in type A were correlated (r=0.78, p=0.005), and were the shortest among the types. Discriminant analysis for type A (n=11) and B (n=20, sleep) showed 80.6% correct classification. In conclusion,type A roll-overs, involving efficient motion with quick re-falling-asleep, may be a useful foundation to develop self-helped roll-over maneuvers.