Insulin Resistance and Blood Pressure Regulation in Blacks

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00005164
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : May 13, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To determine the role of insulin resistance in peripheral vascular dynamics, sodium sensitivity, and blood pressure regulation in a young representative Black population and in a group of young Blacks at high risk for hypertension.

Condition or disease
Cardiovascular Diseases Hypertension Heart Diseases Insulin Resistance

Detailed Description:


Epidemiologic studies have demonstrated a greater prevalence of essential hypertension in Blacks with a disproportionately greater hypertension related mortality in Blacks. Similar vascular consequences occur with diabetes and obesity. These three diseases not only share a common outcome, but also overlap in occurrence with Blacks having greater prevalence rates in the three disorders. Insulin resistance has been documented in all three disorders and may contribute significantly to the vascular disease.

This project originated in response to a Request for Applications on Biobehavioral Factors Affecting Hypertension in Blacks issued in December 1982. The original project was supported by the RFA for three years. The first three years of the study focussed on the hypothesis that sodium loading would augment cardiovascular responses of psychogenic stress in Blacks at high risk for hypertension. The first phase of the study examined and compared 80 Blacks and whites, 18-22 years of age. The second phase involved an additional 40 Black borderline hypertensives who were exposed to the same set of studies designed to examine possible interactions between neurogenic and renal controlled volume mechanisms in essential hypertension.

The project was renewed as a regular research grant in 1986 and was designed to investigated biobehavioral factors in blood pressure control. In 1988, the study on insulin resistance was funded and continued through 1990.


Subjects in this project consisted of Blacks who were enrolled in the Collaborative Perinatal Project (CPP) at birth and who had been studied longitudinally in adolescence and young adulthood. Each subject brought to the study data on blood pressure, growth, and maturation from birth through late adolescence.

Peripheral vascular structure was studied using measures of forearm blood flow and forearm vascular resistance. Measurements of peripheral vascular structure were compared to data on sodium sensitivity and potassium sensitivity in the population. Insulin resistance was studied using the euglycemic hyperinsulinemic clamp technique. Variations in the activity of the sodium-potassium pump and sodium-hydrogen exchange in red cells were correlated with insulin resistance to determine if hyperinsulinemia alters cation transport rates.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

Study Type : Observational
Study Start Date : September 1983
Actual Study Completion Date : August 1991

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Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
No eligibility criteria

Chinese M, Solomon H, Falkner B, Adragna N, Ellison RC: Familial Aggregation of Sodium Countertransport and Cotransport and Essential Hypertension in: Topics on Pathophysiology of Hypertension. Villareal H, Sambhi MP, Nijhoff Publish. Boston, p. 78-87, 1984
Falkner B, Katz S, Chinese M, Kushner H: The Response to Chronic Oral Sodium Loading in Young Blacks. Hypertension, 8 (Suppl I): I-165-168, 1986
Falkner B, Ragonessi SB: Psychosocial Stress and Cardiovascular Reactivity in Juveniles. J Am Acad Child Psychiatry, 140:779, 1986
Falkner B, Light K: The Interactive Effects of Stress and Dietary Sodium on Cardiovascular Reactivity. In: J Hypertens, Stress, Reactivity, and Cardiovascular Disease: Status and Prospects. Eds. Matthews L, Weiss SM, Detre T, Dembroski T, Falkner B, Manuch S, Williams R (Eds), John Wiley and Sons, Inc. New York, p 329-341, 1986
Falkner B: Mild Hypertension in Adolescence. In: Mild Hypertension: From Drug Trials to Practice. Strasser T, Gaten D, (Eds) Raven Press, New York, p 279-283, 1987
Falkner B: Reactivity to Mental Stress in Hypertension and Prehypertension in: Handbook of Hypertension, Vol. 10. Behavioral Factors in Hypertension, Editor Julius S. and Bassett DR. Elsevier Science Publishers. B.V., 1987
Falkner B: Measurement of Volume Regulation: Renal Function. in: Schneiderman N, Kaufman P and Weiss SM (Eds). Handbook of Research Methods in Cardiovascular Behavioral Medicine. New York: Plenum Publishing Corporation, 1989
Falkner B: Etiologic Factors in Essential Hypertension. Loggie J, Robson A (Eds), in: Pediatric and Adolescent Hypertension, 1992.
Falkner B, Rabinowitz AI, Michel SH: Nutrition and Blood Pressure in Childhood: In: Nutritional Factors in Hypertension, Langford H, Levine B (Eds), Alan R Liss, Inc., New York, 1990. Identifier: NCT00005164     History of Changes
Other Study ID Numbers: 1036
R01HL031802 ( U.S. NIH Grant/Contract )
First Posted: May 26, 2000    Key Record Dates
Last Update Posted: May 13, 2016
Last Verified: June 2000

Additional relevant MeSH terms:
Cardiovascular Diseases
Heart Diseases
Insulin Resistance
Glucose Metabolism Disorders
Metabolic Diseases