Anxiety symptom severity is associated with increased arterial blood pressure and arterial blood pressure variability in apparently healthy young adults

Introduction: Lifetime prevalence of anxiety disorders is approximately 30%, and anxiety is associated with an increased susceptibility to develop cardiovascular disease. Anxiety disorders have been linked to hypertension, and autonomic dysfunction has been posited as a contributing factor. However, anxiety symptom severity exists on a continuum, and it is less clear how anxiety severity is associated with blood pressure or beat-to-beat blood pressure variability, a hemodynamic biomarker that reflects dynamic cardiovascular regulatory mechanisms. The objective of this study was to test the hypothesis that self-reported anxiety symptom severity is positively associated with resting blood pressure and beat-to-beat blood pressure variability among healthy young adults without cardiometabolic disease. Methods: Resting beat-to-beat blood pressure (mmHg; finger plethysmography) and anxiety scores from a self-report anxiety symptom questionnaire (Zung Self-Rated Anxiety Scale, ZSRA) were collected in 53 healthy young adults (40 males, 13 females, age = 25 ± 4 yr, BMI = 25 ± 6 kg/m 2 ). Following 10 minutes of quiet rest, signals were recorded over a 10-minute period with participants in a supine position, and the middle 8 minutes were used for analyses. Multiple linear regression was used to examine the independent relations of ZSRA with systolic arterial pressure (SAP), diastolic arterial pressure (DAP), mean arterial pressure (MAP), SAP standard deviation (SAP SD ), DAP standard deviation (DAP SD ), and MAP standard deviation (MAP SD ) while controlling for age and sex. To further understand whether the observed relations between ZSRA and beat-to-beat blood pressure variability were explained by or independent of elevated absolute arterial pressure, partial correlations (r xy,z ) were performed for ZSRA versus SAP SD , DAP SD , and MAP SD while partialling out the effect of SAP, DAP, and MAP, respectively. Results: ZSRA was significantly correlated with SAP (β = 0.34, p = 0.015), MAP (β = 0.32, p = 0.023), SAP SD (β = 0.36, p = 0.008), DAP SD (β = 0.35, p = 0.014), and MAP SD (β = 0.37, p = 0.008). When controlling for SAP, DAP, and MAP, ZSRA was independently associated with SAP SD (r xy,z = 0.34, p = 0.016), DAP SD (r xy,z = 0.35, p = 0.012), and MAP SD (r xy,z = 0.40, p = 0.005). Conclusion: Self-reported anxiety symptom severity is associated with increased blood pressure and beat-to-beat blood pressure variability, which indicates an important relationship between anxiety and blood pressure regulation across a continuum of symptom severity. This study is the first to show a relationship between anxiety and beat-to-beat blood pressure variability, independent of absolute mean blood pressure, among healthy young adults devoid of cardiometabolic disease. Our data build upon and align with previous findings that anxiety symptom severity is associated with increased muscle sympathetic nerve activity among healthy young adults and enhances our understanding of the relationship between anxiety and cardiovascular health, even among apparently healthy individuals. Funding provided by a grant from the Injury Prevention Research Center through the CDC (R49 CE003095; NDMJ). This is the full abstract presented at the American Physiology Summit 2024 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.