Abstract: TH-PO0306
Shift Workers Are Able to Reclaim Nighttime Blood Pressure Dipping During Daytime Sleep
Session Information
- Hypertension and CVD: Clinical - 1
November 06, 2025 | Location: Exhibit Hall, Convention Center
Abstract Time: 10:00 AM - 12:00 PM
Category: Hypertension and CVD
- 1602 Hypertension and CVD: Clinical
Authors
- Onder, Songul, University of Maryland Medical System, Baltimore, Maryland, United States
- Onder, Ali Mirza, Nemours Children's Hospital Delaware, Wilmington, Delaware, United States
Background
Shift workers who work at night-time and sleep at daytime need to replicate the blood pressure dipping (BPD) during daytime sleep. There is limited information on how well they can replicate night-time BPD during daytime sleep.
Methods
Eighty- four medical professionals were evaluated using 24-hour ambulatory blood pressure monitoring (ABPM) for the duration of three distinct work- sleep schedules; work daytime and sleep at night-time, work night-time and sleep during daytime and for an off-work day, awake at daytime and sleep at night-time.
Four study groups were identified; Group A; These who only work at daytime and always sleep at night-time, Group B; Alternating from work at daytime to night-time every 3-4 days, Group C; Alternating from work at daytime to night-time every 3-4 months, and Group D; Those who only work at night-time and always sleep during daytime.
Delta BPD is the difference between the BPD values when two work periods are compared.
Results
The mean reported sleep durations were similar between the four groups for both periods of work schedule. For Goup B and Group C, work at daytime BPD, work at nighttime BPD and off-day BPD were statistically indifferent, demonstrating similar median sleep associated BPD. The Delta BPD for Group B work at nighttime compared to daytime was higher when compared to Group C (5.85% vs 0.55%, p= 0.038). When Group A was compared to Group D, the median sleep associated BPD was similar for workday (15.56% vs 13.47%, p= 0.42) and for off day (11.85% vs 12.67%, p=0.69).
Conclusion
Work at nighttime did not have any negative impact on the duration of sleep. This cohort demonstrated that subjects working at nighttime achieved statistically similar sleep- associated BPD when compared to working at daytime. The delta BPD was higher for frequent switchers (Group B) compared to infrequent switchers (Group C), suggesting there may be some acclimatization with time. This limited study does not suggest a negative impact of nighttime work to sleep-associated BPD.
Sleep associated Blood Pressure Dipping (BPD)
| Sleep BPD | Group A | Group B | Group C | Group D | P value |
| Work daytime | 15.56% | 18.93% | 17.10% | NA | 0.63 |
| Work nighttime | NA | 13.08% | 16.55% | 13.47% | 0.24 |
| Off day | 11.85% | 14.23% | 14.82% | 12.67% | 0.46 |
| P value | 0.18 | 0.12 | 0.67 | 0.79 | NA |
NA: Not applicable; BPD: Blood pressure dipping