Abstract: SA-PO354
Is It Nighttime Dipping or Sleep-Time Dipping?
Session Information
- Hypertension, CVD, and the Kidneys: Clinical Research
October 26, 2024 | Location: Exhibit Hall, Convention Center
Abstract Time: 10:00 AM - 12:00 PM
Category: Hypertension and CVD
- 1602 Hypertension and CVD: Clinical
Authors
- Onder, Ali Mirza, Nemours Children's Hospital Delaware, Wilmington, Delaware, United States
- Onder, Songul, University of Maryland School of Medicine, Baltimore, Maryland, United States
Background
Those subjects who work at night-time and sleep at daytime need to replicate the blood pressure dipping (BPD) phenomena during daytime. There is limited information on how well they can replicate night-time dipping.
Methods
24-hour ambulatory blood pressure monitoring (ABPM) was used for 84 medical professionals during three different work- sleep schedules; work night-time and sleep during daytime, work daytime and sleep at night-time, and for an off-work day, awake at daytime and sleep at night-time.
There were four groups within this cohort: Group A; subjects who only work at daytime and always sleep at night-time, Group B; subjects who switch from working day to night-time every 3-4 days, Group C; subjects who switch from working day to night-time every 3-4 months, and Group D; those who only work at night-time and always sleep during daytime.
Sleep score is defined as the product of the sleep BPD percentage and duration of sleep (hours). The Kruskal Wallis test was used to compare differences among groups, and the Signed rank test was used to evaluate paired differences.
Results
Mean reported sleep durations were similar between the four groups for both periods of work schedule. When Group A was compared to Group D for the median BPD (15.5% vs. 12%) and the sleep score (112 vs. 90), they were statistically indifferent (p=0.31 and p=0.24, respectively). There was no difference for sleep BPD between two different work times for Groups B & C (p=0.47). However, the median sleep score was significantly better when subjects were sleeping at night-time (127.5 vs 103, P=0.02). There was no difference for sleep BPD (p=0.43) and for sleep score (p=0.36), when the four groups were compared for their BPD during an off-work day.
Conclusion
For this cohort, the BPD was associated with sleep-time rather than night-time. Subjects who work at night had similar sleep BPD compared to subjects who work at daytime. The personal history of night-time work did not impact the sleep BPD on an off-work day. A significantly higher sleep score was achieved by the alternating subjects when they slept at night-time, because of longer reported sleep duration.