Sleep quality and PTSD symptoms predict vascular dysfunction in young, trauma-exposed women

Abstract

Introduction: Cardiovascular disease (CVD) remains the leading cause of death among women in the United States. Although premenopausal women are thought to be protected from CVD, trauma exposure increases their CVD risk. Poor sleep – a CVD risk factor – is common after trauma exposure. Further, accumulating evidence suggests that vascular dysfunction is independently associated with CVD. However, the link between sleep and vascular function in otherwise healthy, trauma-exposed young women is not known. Therefore, the purpose of the present study was to investigate the individual and combined effects of sleep quality and post-traumatic stress disorder (PTSD) symptom severity on endothelial function and arterial stiffness. Methods: We recruited 42 otherwise healthy women (18 –­ 40 years) from diverse backgrounds who had been exposed to trauma. We successfully collected data on sleep, vascular function, depression and PTSD symptom severity in 35 women, across two visits. Sleep efficiency (SE) was objectively measured as the relative time (%) spent asleep while in bed, using wrist actigraphy. Participants wore the ActiWatch for seven days between visits. During visit one, PTSD symptom severity was assessed using the PTSD checklist for DSM 5 (PCL5) and depressive symptom severity with the Beck Depression Inventory (BDI). At visit two, we assessed endothelial function via reactive hyperemia index (RHI) using peripheral arterial tone and arterial stiffness via pulse wave velocity (PWV) using applanation tonometry. Results: Participants’ mean age and body mass index (BMI) were 27±7 years and 27±6 kg/m 2 respectively. Mean systolic and diastolic blood pressures were 103±9 and 67±8 mmHg respectively, and heart rate was 74±12 bpm. SE was positively correlated with RHI (r=0.35, p=0.019), and negatively correlated with PWV (r=-0.46, p=0.004). PCL5 score was negatively correlated with RHI (r=-0.52, p<0.001), and not PWV (r=0.12, p=0.253). Additionally, a positive association was observed between age and PWV (r=0.50, p=0.001). BDI score was only correlated with PCL5 (r=0.60, p<0.001). Next, to explore the predictive value of SE and PCL5 on RHI and PWV, we conducted separate multiple linear regression models with SE, PCL5 scores and age as predictors. The model predicting RHI was significant (R 2 =0.48, p<0.001), with PCL5 emerging as the strongest predictor (β=-0.56, p<0.001). Similarly, the model predicting PWV was significant (R 2 =0.45, p<0.001), with both SE and age as the strongest predictors (β=-0.44, p=0.004 and β=0.49, p=0.001, respectively). Conclusion: Our results suggest that poor sleep may contribute to increased arterial stiffness after trauma exposure, while endothelial dysfunction could be driven by PTSD symptom severity. These findings could serve to distinguish trauma-exposed women at risk of CVD and identify specific interventions (i.e., targeting sleep efficiency or PTSD symptoms) to prevent or delay vascular dysfunction. UL1TR002494, NIH K01HL161027 This is the full abstract presented at the American Physiology Summit 2023 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.