Diastolic Blood Pressure and Cognitive Functioning: Differences by Systolic Blood Pressure Among US Adults

BackgroundThe role of diastolic blood pressure (DBP) with cognitive functioning is under-explored in relation to levels of systolic blood pressure (SBP).MethodsWe studied 5466 participants from the National Health and Nutrition Examination Survey. Blood pressure was measured 3 times manually with a standardized sphygmomanometer and averaged. Cognitive functioning was measured using the digit symbol substitution test (DSST).ResultsParticipants were 60 years or older, 55% female, and 81% non-Hispanic White. Most participants had a DBP between 70 to <80 mmHg (33.7%), between 60 to <70 mmHg (29.3%), or <60 mmHg (18.8%). From multivariable linear regression analyses, each 5 mmHg increment of DBP was associated with significantly higher DSST scores among individuals with SBP <120 only (ss: 0.56, 95% CI: 0.09, 1.03).ConclusionsAmong older US adults, at non-elevated levels of SBP, higher DBP is associated with better cognitive performance.