LAUSR

OBJECTIVE Psychological distress may be intensified and prolonged by perseverative thinking (e.g., rumination, worry). The tendency to engage frequently in perseverative thinking has been linked to increased blood pressure (BP). Research is needed to investigate the physiological consequences of time spent perseverating by testing the momentary association between the duration of perseverative thinking and blood pressure. The present study examines the extent to which the duration of perseverative thinking is associated with momentary perceived stress and ambulatory BP elevations during daily life. METHODS Participants (N = 373) drawn from a larger project on BP and cardiovascular health completed 24-hour ambulatory BP monitoring accompanied by ecological momentary assessments of their perseverative thoughts and feelings. Multilevel models tested associations among perseveration duration, momentary perceived stress, and systolic and diastolic BP, adjusting for person-level and momentary covariates. RESULTS Higher within-subject perseveration duration was associated with higher stress (B = 0.29; 95% confidence interval [CI] = 0.24, 0.33; p < .001). Although higher perseveration duration was not associated with substantially higher systolic (B = 0.16 mmHg; 95% CI = 0.00, 0.33; p = .056) or diastolic (B = 0.07 mmHg, 95% CI = -0.05, 0.19; p = .25) BP, the associations between higher perseveration duration and higher systolic (p = .032) and diastolic (p = .036) BP were significantly mediated by a higher intensity of momentary perceived stress. CONCLUSIONS Findings support the clinically important notion that physiological consequences of perceived stress can be maintained and even heightened by maladaptively prolonged mental activity.