CARDIOVASCULAR JOURNAL OF AFRICA • Vol 23, No 2, March 2012
AFRICA
83
been ascertained, as these could have affected the CRP values in
this study.
Conclusion
Both African and Caucasian women displayed possible dysregu-
lation of the HPA axis, which could explain the hypertension in
these groups. The roles of CRP and cortisol remain uncertain
in these groups. However, in the Caucasian women, cortisol
presented a higher likelihood of contribution towards hyperten-
sion than in the African women, whereas in the hypertensive
African women, CRP seemed to play a larger role (Tables 3, 4).
Future studies should include further examination of the role of
dysregulation of the HPA axis in these groups and the possible
mechanisms of action regarding the incidence of hypertension
considering these effects.
We thank the participants and all supporting staff that contributed to the
POWIRS study. We are also grateful to the financial contributors to this
project: the National Research Foundation (GUN 2054068), the Medical
Research Council and the Research Focus Area 9.1 of the North-West
University (Potchefstroom campus).
References
1.
Meyburgh D, Malan L, Van Rooyen JM, Potgieter JC. Cardiovascular,
cortisol and coping responses in urban Africans: The SAPBA study.
Cardiovasc J Afr
2012;
23
(1): 29–34.
2.
Gerin W, Pickering TG, Glynn L, Christenfeld N, Schwartz A, Carroll
D,
et al
. An historical context for behavioral models of hypertension.
J
Psychosom Res
2000;
48
: 369–377.
3.
Hinderliter AL, Blumenthal JA, Waugh R, Chilukuri M, Sherwood A.
Ethnic differences in left ventricular structure: relations to hemody-
namics and diurnal blood pressure variation.
Am J Hypertens
2004;
17
: 43–49.
4.
Huisman HW, van Rooyen JM, Malan NT, Eloff FC, Malan L,
Laubscher PJ,
et al
. Prolactin, testosterone and cortisol as possible
markers of changes in cardiovascular function associated with urbaniza-
tion.
J Hum Hypertens
2002;
16
: 829–835.
5.
Seedat YK. Perspectives on research in hypertension.
Cardiovasc J Afr
2009;
20
(1): 39–42.
6.
Hamer M, Malan L. Psychophysiological risk markers of cardiovas-
cular disease. In: Psychophysiological Biomarkers of Health. Special
Edition:
Neurosc Biobehav Rev
2010;
35
: 76–83.
7.
Schutte AE, Huisman HW, van Rooyen JM, Schutte R, Malan L,
Reimann M,
et al
. Should obesity be blamed for the high prevalence
rates of hypertension in black South African women?
J Hum Hypertens
2008;
22
: 528–536.
8.
Björntorp P, Rosmond R. Obesity and cortisol.
Nutrition
2000;
16
(10):
924–936.
9.
Rosmond R. Role of stress in the pathogenesis of the metabolic
syndrome.
Psychoneuroendocrinology
2005;
3
0: 1–10.
10. Kopp MS, Réthelyi J. Where psychology meets physiology: chronic
stress and premature mortality – the Central–Eastern European health
paradox.
Brain Res Bull
2004;
62
: 351–367.
11. Black PH. The inflammatory response is an integral part of the stress
response: Implications for atherosclerosis, insulin resistance, type II
diabetes and metabolic syndrome X.
Brain Behav Immun
2003;
17
:
350–364.
12. Misra A, Vikram NK. Clinical and pathophysiological consequences
of abdominal adiposity and abdominal adipose tissue depots.
Nutrition
2003;
19
: 457–466.
13. Frühbeck G, Salvador J. Role of adipocytokines in metabolism and
disease.
Nutr Res
2004;
24
: 803–826.
14. Ahima RS, Flier JS. Adipose tissue as an endocrine organ.
Transmis
Electron Microsc
2000;
11
(8): 327–332.
15. Black PH. The inflammatory consequences of psychologic stress:
Relationship to insulin resistance, obesity, atherosclerosis and diabetes
mellitus, type II.
Med Hypotheses
2006;
67
: 879–891.
16. Schutte AE, Kruger HS, Wissing MP, Underhay C, Vorster HH. The
emergence of the metabolic syndrome in urban obese African women:
The POWIRS study.
S Afr J Sci
2005;
101
: 61–67.
17. World Health Organization. Obesity: Preventing and managing the
global epidemic. Report of a WHO consultation on obesity, June 3–5,
1997, Geneva, Switzerland. World Health Organisation: Geneva, 1997.
18. International Society of Hypertension (ISH) statement on management
of hypertension.
J Hypertens
2003;
21
: 1983–1992.
19. Hellhammer DH, Wüst S, Kudielka BM. Salivary cortisol as biomarker
in stress research.
Psychoneuroendocrinology
2009;
34
: 163–171.
20. Malan NT, Van der Merwe JS, Huisman HW, Kruger A, Eloff FC,
Pretorius PJ,
et al
. A comparison of cardiovascular reactivity of rural
blacks, urban blacks and whites.
Stress Med
1992;
8
: 1–6.
21. Gerin W, Pickering TG, Glynn L, Christenfeld N, Schwartz A, Carroll
D
et al
. An historical context for behavioral models of hypertension.
J
Psychosom Res
2000;
48
: 369–377.
22. Suarez EC, Saab PG, Llabre MM, Kuhn CM, Zimmerman E. Ethnicity,
gender, and age effects on adrenoreceptors and physiological responses
to emotional stress.
Psychophysiology
2004;
41
: 450–460.
23. Knox SS, Hausdorff J, Markovitz JH. Reactivity as a predictor of
subsequent blood pressure. Racial differences in the coronary artery
risk development in young adults (CARDIA) study.
Hypertension
2002;
40
: 914.
24. Liao Y, Tucker P, Okoro CA, Giles WH, Mokdad AH, Harris VB.
REACH 2010, Surveillance for health status in minority communi-
ties – United States, 2001–2002. MMWR. Surveillance summaries:
Morbidity and mortality weekly report.
Surveillance summaries
2004;
53
(6): 1–36.
25. Rexrode KM, Pradhan A, Manson JE, Buring JE, Ridker PM.
Relationship of total and abdominal adiposity with CRP and IL-6 in
women.
Ann Epidemiol
2003;
13
(10): 674–682.
26. Vikram NK, Misra A, Dwivedi M, Sharma R, Pandey RM, Luthra K,
et al
. Correlations of C-reactive protein levels with anthropometric
profile, percentage of body fat and lipids in healthy adolescents and
young adults in urban North India.
Atherosclerosis
2003;
168
: 305–313.
27. Lear SA, Chen MM, Birmingham CL, Frohlich JJ. The relationship
between simple anthropometric indices and C-reactive protein: ethnic
and gender differences.
Metabolism
2003;
52
(12): 1542–1546.
28. Albert MA, Glynn RJ, Buring J, Ridker PM. C-reactive protein levels
among women of various ethnic groups living in the United States (from
the Women’s Health Study).
Am J Cardiol
2004;
93
(10): 1238–1242.
29. Libby P, Ridker PM. Inflammation and atherosclerosis: Role of
C-reactive protein in risk assessment.
Am J Med
2004;
116
(6A):
9S–16S.
30. Yudkin JS, Kumari M, Humphries SE, Mohamed-Ali V. Inflammation,
obesity, stress and coronary heart disease: is interleukin-6 the link?
Atherosclerosis
2000;
148
: 209–214.
31. al’Absi M, Arnett DK. Adrenocorticol responses to psychological stress
and risk for hypertension.
Biomed Pharmacother
2000;
54
: 234–244.
32. Whitworth JA, Brown MA, Kelly JJ, Williamson PM. Mechanisms of
cortisol-induced hypertension in humans.
Steroids
1995;
60
: 76–80.
33. Malan NT, Brits JS, Eloff FC, Huisman HW, Kruger A, Laubscher PJ,
et
al
. The influence of acculturation on endocrine reactivity during acute
stress in urban black males.
Stress Med
1996;
12
: 55–63.
34. Kullo IJ, McConnell JP, Bailey KR, Kardia SL, Bielak LF, Peyser PA,
et al
. Relation of C-reactive protein and fibrinogen to coronary artery
calcium in subjects with systemic hypertension.
Am J Cardiol
2003;
92
: 56–58.
35. Srikumar N, Hopkins PN, Jeunemaitre X, Hunt SC, Williams GH.
Inflammatory marker C-reactive protein in hypertensive subjects.
Am J
Hypertens
2002;
15
(4): 227A.
36. Sesso HD, Buring JE, Rifai N, Blake GJ, Gaziano JM, Ridker RM.
C-reactive protein and the risk of developing hypertension.
J Am Med
Assoc
2003;
290
: 2945–2951.
37. de Ferranti S, Rifai N. C-reactive protein and cardiovascular disease:
a review of risk prediction and interventions.
Clin Chim Acta
2002;
317
: 1–15.