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Low arterial compliance in young African-American males
Adrienne S Zion1, Vernon Bond, Richard G Adams
1Department of Rehabilitation Medicine, Mailman School of Public Health, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, Box 38, New York, NY 10032.
Insights
Young African-American males exhibit lower arterial compliance and altered autonomic function compared to non-African-American males. These cardiovascular differences may serve as early indicators of disease risk.
Area of Science:
- Cardiovascular Physiology
- Autonomic Nervous System Function
- Public Health
Background:
- Hypertension is a significant public health issue, particularly impacting Black males who experience more severe cardiovascular complications.
- Changes in arterial wall elasticity and autonomic nervous system regulation often precede hypertension development.
Purpose of the Study:
- To investigate differences in arterial compliance and autonomic function between young, healthy African-American males and age/gender-matched non-African-American males.
- To identify potential early markers for cardiovascular disease risk in African-American males.
Main Methods:
- Noninvasive assessment of arterial compliance using radial artery pulse wave analysis.
- Power spectral analysis of heart rate and blood pressure variability to evaluate autonomic modulation (parasympathetic and sympathetic activity) and sympathovagal balance.
- Calculation of baroreflex sensitivity (BRS) using the sequence method.
Main Results:
- African-American males demonstrated significantly lower arterial compliance (P = 0.0017) compared to non-African-American males.
- Reduced parasympathetic modulation (P = 0.0063) and baroreflex sensitivity (P = 0.0007) were observed in African-American males.
- African-American males exhibited a higher sympathovagal balance (P = 0.03), indicating a shift towards sympathetic dominance.
Conclusions:
- Significant differences in arterial compliance and autonomic balance exist between young African-American and non-African-American males.
- These physiological alterations may represent precursor markers for cardiovascular disease.
- Findings suggest potential for early detection of degenerative cardiovascular processes in at-risk African-American individuals.
Abstract:
Hypertension remains a common public health challenge because of its prevalence and increase in co-morbid cardiovascular diseases. Black males have disproportionate pathophysiological consequences of hypertension compared with any other group in the United States. Alterations in arterial wall compliance and autonomic function often precede the onset of disease. Accordingly, our purpose was to investigate whether differences exist in arterial compliance and autonomic function between young, healthy African-American males without evidence of hypertension and age- and gender-matched non-African-American males. All procedures were carried out noninvasively following rest. Arterial compliance was calculated as the integrated area starting at the well-defined nadir of the incisura of the dicrotic notch to the end of diastole of the radial artery pulse wave. Power spectral analysis of heart rate and blood pressure variability provided distributions representative of parasympathetic and sympathetic modulations and sympathovagal balance. Baroreflex sensitivity (BRS) was calculated using the sequence method. Thirty-two African-American and twenty-nine non-African-American males were comparable in anthropometrics and negative family history of hypertension. t-Tests revealed lower arterial compliance (5.8 +/- 2.4 vs. 8.6 +/- 4.0 mmHg. s; P = 0.0017), parasympathetic modulation (8.9 +/- 1.1 vs. 9.7 +/- 1.1 ln ms2; P = 0.0063), and BRS (13.7 +/- 7.3 vs. 21.1 +/- 8.5 ms/mmHg; P = 0.0007) and higher sympathovagal balance (2.9 +/- 3.2 vs. 1.5 +/- 1.1; P = 0.03) in the African-American group. In summary, differences exist in arterial compliance and autonomic balance in African-American males. These alterations may be antecedent markers of disease and valuable in the detection of degenerative cardiovascular processes in individuals at risk.