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Should obesity be blamed for the high prevalence rates of hypertension in black South African women?
MedLine Citation:
PMID:  18432254     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Hypertension is highly prevalent in South Africa, resulting in high stroke mortality rates. Since obesity is very common among South African women, it is likely that obesity contributes to the hypertension prevalence. The aims were to determine whether black African women have higher blood pressures (BPs) than Caucasian women, and whether obesity is related to their cardiovascular risk. African (N=102) and Caucasian (N=115) women, matched for age and body mass index, were included. Correlations between obesity (total body fat, abdominal obesity and peripheral fat) and cardiovascular risk markers (haemodynamic parameters, lipids, inflammatory markers, prothrombotic factors, adipokines, HOMA-IR (homoeostasis model assessment insulin resistance)) were compared between the ethnic groups (adjusted for age, smoking, alcohol and physical activity). Comparisons between low- and high-BP groups were also made for each ethnic group. Results showed that African women had higher BP (P<0.01) with increased peripheral vascular resistance. Surprisingly, African women showed significantly weaker correlations between obesity measures and cardiovascular risk markers when compared to Caucasian women (specifically systolic BP, arterial resistance, cardiac output, fibrinogen, plasminogen activator inhibitor-1, leptin and resistin). Interestingly, the latter risk markers were also not significantly different between low- and high-BP African groups. African women, however, presented significant correlations of obesity with triglycerides, C-reactive protein and HOMA that were comparable to the Caucasian women. Although urban African women have higher BP than Caucasians, their obesity levels are weakly related to traditional cardiovascular risk factors compared to Caucasian women. The results, however, suggest a link with the development of insulin resistance.
Authors:
A E Schutte; H W Huisman; J M Van Rooyen; R Schutte; L Malan; M Reimann; J H De Ridder; A van der Merwe; P E H Schwarz; N T Malan
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-24
Journal Detail:
Title:  Journal of human hypertension     Volume:  22     ISSN:  0950-9240     ISO Abbreviation:  J Hum Hypertens     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-17     Completed Date:  2008-12-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8811625     Medline TA:  J Hum Hypertens     Country:  England    
Other Details:
Languages:  eng     Pagination:  528-36     Citation Subset:  IM    
Affiliation:
School for Physiology, Nutrition and Consumer Sciences, North-West University, Potchefstroom, South Africa. alta.schutte@nwu.ac.za
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MeSH Terms
Descriptor/Qualifier:
Adult
African Continental Ancestry Group*
Blood Pressure / physiology
Body Mass Index
Cross-Sectional Studies
Female
Humans
Hypertension / ethnology*,  etiology
Middle Aged
Obesity / complications*,  ethnology
Prevalence
Risk Factors
South Africa / epidemiology
Young Adult

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