Children's cardiovascular reactivity: stability of racial differences and relation to subsequent blood pressure over a one-year period
Related Experiment Videos
J K Murphy1, B S Alpert, S S Walker
1Division of Behavioral Medicine, Miriam Hospital, Providence, RI 02906.
Insights
Black children showed higher blood pressure and heart rate reactivity than White children. Cardiovascular reactivity to stress may predict future blood pressure levels, especially in Black girls.
Area of Science:
- Pediatric cardiovascular health
- Psychophysiology
- Hypertension research
Background:
- Childhood blood pressure and heart rate reactivity are key indicators of cardiovascular health.
- Understanding ethnic and developmental differences in cardiovascular responses is crucial for public health.
- Psychological stress can significantly impact physiological responses in children.
Purpose of the Study:
- To investigate racial and gender differences in blood pressure and heart rate reactivity in children.
- To examine the longitudinal association between cardiovascular reactivity and resting blood pressure.
- To identify factors influencing the development of hypertension risk from childhood.
Main Methods:
- Longitudinal study tracking 477 third-graders, with 91% followed up in fourth grade.
- Measurement of resting and video game-induced blood pressure and heart rate.
- Regression analyses to assess the relationship between reactivity and subsequent resting blood pressure.
Main Results:
- Black children exhibited greater blood pressure and heart rate reactivity than White children across both years.
- Heart rate reactivity increased from third to fourth grade, particularly in Black children.
- Systolic reactivity predicted subsequent resting systolic pressure, especially in Black girls; diastolic reactivity predicted resting diastolic pressure in White children.
Conclusions:
- Cardiovascular reactivity to psychological stress is a significant predictor of future blood pressure levels.
- Elevated heart rate reactivity in Black children may contribute to the higher prevalence of hypertension in Black adults.
- Racial and gender-specific patterns in cardiovascular reactivity warrant further investigation for targeted interventions.
Abstract:
After measuring blood pressure and heart rate at rest and during a video game procedure in 477 children enrolled in 3rd grade, 434 (91%) children had these measurements repeated a year later in 4th grade. Black children demonstrated greater blood pressure and heart rate reactivity than White children in both years, and an increase in heart rate reactivity from 3rd to 4th grade. Gender effects were inconsistent. Systolic and diastolic blood pressures during the video game were more highly correlated from year-to-year than were the resting measures. Regression analysis indicated that systolic reactivity was significantly related to subsequent systolic pressure at rest, particularly among Black girls. Diastolic reactivity was associated with subsequent resting diastolic pressure only among White children. Associations between reactivity and future blood pressure were independent of initial resting blood pressure. This study suggests that cardiovascular reactivity to psychological stress may be one important factor in future level of blood pressure and that the increased heart rate reactivity of Black children may be associated with the prevalence of hypertension among Black adults.