Browsing Research Output by Author "10176527 - Steyn, Hendrik Stefanus"
Now showing items 1-20 of 39
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A norm for an academic literacy placement test
Van der Walt, Johann L.; Steyn, Faans (SAALT/SAVTO, 2016)A test series usually consists of various versions of a test. Test-takers and consumers of tests expect all these versions to be at the same level of difficulty, but this is very difficult to achieve at the test design ... -
Association of waist circumference with perception of own health in urban African males and females: the Sympathetic Activity and Ambulatory Blood Pressure in Africans (SABPA) study
Botha, J.; Malan, L.; Potgieter, J.C.; Steyn, H.S.; De Ridder, J.H. (Health & Medical Publishing Group (JEMDSA), 2012)Background: Current waist circumference (WC) cut-points of the Joint Statement Consensus (JSC) (male ≥ 94 cm, female ≥ 80 cm) were compared with a recently proposed WC cut-point (RPWC) (male ≥ 90 cm, female ≥ 98 cm). In ... -
Association of waist circumference with perception of own health in urban African males and females: the Sympathetic Activity and Ambulatory Blood Pressure in Africans (SABPA) study
Botha, J.; Malan, L.; Potgieter, J.C.; Steyn, H.S.; De Ridder, J.H. (Taylor & Francis, 2012)Background: Current waist circumference (WC) cut-points of the Joint Statement Consensus (JSC) (male ≥ 94 cm, female ≥ 80 cm) were compared with a recently proposed WC cut-point (RPWC) (male ≥ 90 cm, female ≥ 98 cm). In ... -
Attenuated NOx responses and myocardial ischemia, a possible risk for structural vascular disease in African men: the SABPA study
Uys, A.S.; Malan, L.; Van Rooyen, J.M.; Steyn, H.S.; Reimann, M. (Nature Publishing Group, 2014)Chronically elevated blood pressure has been associated with impaired NO-mediated vasodilation and structural vascular disease risk. This study aimed to determine whether significant associations exist regarding NO metabolite ... -
Baroreceptor sensitivity, cardiovascular responses and ECG left ventricular hypertrophy in men: the SABPA study
Steyn, Hendrik Stefanus; Van Rooyen, Johannes Marthinus; Van Lill, Lisa; Malan, Leoné; Reimann, Manja; Ziemssen, Tjalf (Informa Health care, 2011)Aim. Research has shown a significant relationship between hypertension and attenuated baroreceptor sensitivity (BRS), which in turn reflects alterations of autonomic control of the cardiovascular system. The objective of ... -
Cardiometabolic markers to identify cardiovascular disease risk in HIV-infected black South Africans
Van Rooyen, J.M.; Fourie, C.M.T.; Steyn, H.S.; Koekemoer, G.; Huisman, H.W.; Schutte, R.; Malan, L.; Glyn, M.; Smith, W.; Mels, C. (SA Medical Association, 2014)BACKGROUND: The prevalence of HIV is the highest in sub-Saharan Africa; South Africa (SA) is one of the most affected countries with the highest number of adults living with HIV infection in the world. Besides the traditional ... -
Change over three years in adolescents' physical activity levels and patterns after a physical activity intervention: play study
Pienaar, A.E.; Kruger, H. Salome; Steyn, H.S.; Naudé, D. (Edizioni Minerva Medica, 2012)AIM: This study aimed to determine over a three-year period what the PA levels and patterns of adolescents will be after participating in a physical activity (PA) intervention. METHODS: African adolescents (158 boys, 211 ... -
Change over three years in adolescents’ physical activity levels and patterns after a physical activity intervention: play study
Pienaar, A.E.; Kruger, Salome; Steyn, H.S.; Naudé, D. (Edizioni Minerva Medica, 2012)AIM: This study aimed to determine over a three-year period what the PA levels and patterns of adolescents will be after participating in a physical activity (PA) intervention. METHODS: African adolescents (158 boys, 211 ... -
Chronic defensiveness and neuroendocrine dysfunction reflect a novel cardiac troponin T cut point: the SABPA study
Malan, Leoné; Hamer, Mark; Von Känel, Roland; Steyn, Hendrik S.; Malan, Nicolaas T. (Elsevier, 2017)Background Sympatho-adrenal responses are activated as an innate defense coping (DefS) mechanism during emotional stress. Whether these sympatho-adrenal responses drive cardiac troponin T (cTnT) increases are unknown. ... -
Chronic depression symptoms and salivary NOx are associated with retinal vascular dysregulation: the SABPA study
Malan, Leoné; Hamer, Mark; Von Känel, Roland; Harvey, Brian H.; Steyn, Faans; Malan, Nico T. (Elsevier, 2016)Background Depression has been associated with impaired nitric oxide (NO)-mediated vasodilation and vascular dysregulation (VD). Whether depression and NO levels will disturb retinal haemodynamics is not clear. Objectives ... -
Cohort profile: sympathetic activity and ambulatory blood pressure in Africans (SABPA) prospective cohort study
Malan, Leoné; Hamer, Mark; Steyn, Hendrik S.; Malan, Nicolaas T.; Frasure-Smith, Nancy (Oxford Univ Press, 2015)Adapting to an over–demanding stressful urban environment may exhaust the psychophysiological resources to cope with these demands, and lead to sympathetic nervous system dysfunction. The evidence that an urban–dwelling ... -
Consumers’ knowledge about and attitudes towards lucerne (Medicago sativa l.)
Mielmann, Annchen; Steyn, Faans; Bothma, Carina; Hugo, Celia J. (SAAFECS, 2017)Over the past few years, interest has grown about the health benefits of lucerne (alfalfa), however, little is known about consumers’ attitudes towards consuming this forage legume. Therefore, the aim of this study was to ... -
Coping facilitated troponin T increases and hypo-responsivity in the copeptin-HPA-axis during acute mental stress in a black cohort: the SABPA study
Myburgh, Catharina Elizabeth; Malan, Leoné; Möller, Marisa; Steyn, Faans; Malan, Nicolaas Theodor (Elsevier, 2019)Background Defensive coping (DefS) was associated with a vulnerable cardiovascular profile in blacks. The copeptin/vasopressin system is a manifestation of hypothalamic-pituitary-adrenal-axis activity and may act as an ... -
Coping mechanisms, perception of health and cardiovascular dysfunction in Africans
Malan, Leoné; Schutte, Aletta Elisabeth; Malan, Nicolaas Theodor; Wissing, Maria Philipina; Vorster, Hester Hendrina; Steyn, Hendrik Stefanus; Van Rooyen, Johannes Marthinus; Huisman, Hugo Willem (Elsevier, 2006)The purpose of this study was to compare active and passive coping strategies of Africans with perception of own health and cardiovascular data. The subjects included 236 apparently healthy Africans (men = 109; women = 127). ... -
Cultural coping as a risk for depression and hypertension: the SABPA prospective study
Le Roux, S.; Lotter, G.A.; Steyn, H.S.; Malan, L. (Clinics Cardive, 2018)Objectives: In past studies, a lack of social support has been associated with cardiovascular disease (CVD) risk, particularly in black Africans. However, whether or not coping strategies have beneficial effects on blood ... -
Defensive active coping facilitates chronic hyperglycaemia and endothelial dysfunction in African men: the SABPA study
Malan, L.; Hamer, M.; Steyn, H.S.; Schutte, R.; Smith, W.; Van Rooyen, J.M.; Fourie, C.M.T.; Malan, N.T. (Elsevier, 2013)Background: Dissociation between behavioural defensive active coping (AC) control albeit physiological “loss of control” responses was associated with silent ischaemia and structural wall abnormalities in African men. Whether ... -
Defensive coping, urbanization, and neuroendocrine function in Black Africans: the THUSA study
Malan, Leoné; Huisman, Hugo; Van Rooyen, Johannes; Schutte, Alta; Schutte, Rudolph; Potgieter, Johan; Wissing, Marié; Steyn, Faans; Malan, Nico (Wiley, 2012)Dissociation between b-adrenergic behavioral and physiological defensive active coping (AC) responses was associated with cardiometabolic risk in urban but not rural African males. Whether this is partly driven by underlying ... -
Determining the waist circumference cut off which best predicts the metabolic syndrome components in urban Africans: the SABPA study
Prinsloo, J.; Malan, L.; De Ridder, J.H.; Potgieter, J.C.; Steyn, H.S. (Thieme Publishing, 2011)Various studies have shown that the relationship between waist circumference (WC) and abdominal obesity is age, gender as well as ethnicity-dependent. WC criteria for Sub Saharan Africans have not been defined by the ... -
Determining the waist circumference cut off which best predicts the metabolic syndrome components in urban Africans: the SABPA study
Malan, Leoné; Potgieter, Johannes Cornelis; Steyn, Hendrik Stefanus; Prinsloo, J.; De Ridder, Johannes Hendrik (Thieme Publications, 2011)Various studies have shown that the relationship between waist circumference (WC) and abdominal obesity is age, gender as well as ethnicity-dependent. WC criteria for Sub Saharan Africans have not been defined by the ... -
Development and evaluation of a rapid multiplex-PCR based system for Mycobacterium tuberculosis diagnosis using sputum samples
Mutingwende, Isaac; Vermeulen, Urban; Steyn, Faans; Grobler, Anne; Viljoen, Hendrik (Elsevier, 2015)Global tuberculosis (TB) control and eradication is hampered by the unavailability of simple, rapid and affordable diagnostic tests deployable at low infrastructure microscopy centers. We have developed and evaluated the ...