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Original Article

Racial Differences in the Relation between Blood Pressure and Insulin Resistance

Mohammed F. Saad, M.D., M.R.C.P., Stephen Lillioja, M.B., B.Ch., F.R.A.C.P., Bulangu L. Nyomba, M.D., Ph.D., Charles Castillo, M.D., Robert Ferraro, M.D., Michele De Gregorio, M.D., Eric Ravussin, Ph.D., William C. Knowler, M.D., Dr.P.H., Peter H. Bennett, M.B., F.R.C.P., Barbara V. Howard, Ph.D., and Clifton Bogardus, M.D.

N Engl J Med 1991; 324:733-739March 14, 1991

Abstract
Abstract

Background.

Insulin resistance and the concomitant compensatory hyperinsulinemia have been implicated in the pathogenesis of hypertension. However, reports on the relation between insulin and blood pressure are inconsistent. This study was designed to investigate the possibility of racial differences in this relation.

Methods.

We studied 116 Pima Indians, 53 whites, and 42 blacks who were normotensive and did not have diabetes; the groups were comparable with respect to mean age (29, 30, and 31 years, respectively) and blood pressure (113/70, 111/68, and 113/68 mm Hg, respectively). Insulin resistance was determined by the euglycemic—hyperinsulinemic clamp technique during low-dose (40 mU per square meter of body-surface area per minute) and high-dose (400 mU per square meter per minute) insulin infusions.

Results.

The Pima Indians had higher fasting plasma insulin concentrations than the whites or blacks (176, 138, and 122 pmol per liter, respectively; P = 0.002) and lower rates of whole-body glucose disposal during both the low-dose (12.7, 17.1, and 19.5 mmol per minute; P<0.001) and the high-dose (38.0, 43.1, and 45.7 mmol per minute; P<0.001) insulin infusions. After adjustment for age, sex, body weight, and percentage of body fat, mean blood pressure (calculated as 1/3 systolic pressure + 2/3 diastolic pressure) was significantly correlated with the fasting plasma insulin concentration (r = 0.42) and the rate of glucose disposal during the low-dose (r = –0.41) and high-dose (r = –0.49) insulin infusions (P<0.01 for each) in whites, but not in Pima Indians (r = –0.06, –0.02, and -0.04, respectively) or blacks (r = –0.10, –0.04, and 0.02, respectively).

Conclusions.

The relations between insulinemia, insulin resistance, and blood pressure differ among racial groups and may be mediated by mechanisms active in whites, but not in Pima Indians or blacks. (N Engl J Med 1991;324:733–9.)

Media in This Article

Figure 1Relation between Mean Blood Pressure and Fasting Plasma Insulin Concentration (Top Panel) and Insulin-Mediated Glucose Disposal during Low-Dose (Middle Panel) and High-Dose (Bottom Panel) Insulin Infusions in Pima Indians, Whites, and Blacks, after Adjustment for Age, Sex, Body Weight, and Percentage of Body Fat.
Figure 2Relation between Mean Blood Pressure and Metabolic Rate at Rest in Pima Indians, Whites, and Blacks, after Adjustment for Age, Sex, Body Weight, and Percentage of Body Fat.
Article

SEVERAL studies have demonstrated insulin resistance in patients with essential hypertension1 2 3 4 and an inverse relation between blood pressure and insulin-mediated glucose disposal.1 , 2 Thus, it has been postulated that the compensatory hyperinsulinemia that results from insulin resistance may contribute to the pathogenesis of hypertension.5 Indeed, hyperinsulinemia has been reported in patients with hypertension,6 7 8 9 and a strong positive relation between plasma insulin concentration and blood pressure has been documented in some studies.10 11 12 13 Insulin may elevate blood pressure by stimulating the sympathetic nervous system,14 increasing renal sodium retention,15 modulating cation transport,16 or inducing hypertrophy of vascular smooth muscle.17 Several studies, however, found no relation between insulin concentrations and blood pressure, or only a weak one.18 19 20 21 22 23 24 25 26 Pima Indians commonly have insulin resistance and hyperinsulinemia,27 but they have a lower prevalence of hypertension than the general U.S. population, and their plasma insulin concentrations in a fasting state and after carbohydrate loading are not significantly related to blood pressure when there is control for body-mass index (weight in kilograms divided by the square of the height in meters) and plasma glucose concentration.28 These observations appear to contradict the postulated link between insulin resistance, insulinemia, and blood pressure and raise the possibility of differences in the effects of insulin on blood pressure in different racial or ethnic groups. Consequently, we investigated the relations between plasma insulin concentration, insulin-mediated glucose disposal, and blood pressure in Pima Indians, whites, and blacks.

Methods

Subjects

We studied 116 Pima Indians, 53 whites, and 42 blacks (Table 1Table 1Physical Characteristics of the Subjects in the Three Groups.*). The Pima Indians were recruited from among subjects participating in a longitudinal study on the development of non-insulin-dependent diabetes. The whites and blacks were recruited by advertising in the local community. The whites were American whites whose parents and grandparents were white. The blacks were American blacks whose parents and grandparents were black. Afro-Caribbeans and blacks from countries other than the United States were not included.

The subjects in the three groups were selected to be of comparable age, sex, and body weight. All were required to be healthy, as assessed by medical history, physical examination, and routine hematologic, biochemical, and urine tests. They were not selected on the basis of their blood pressure, but those with hypertension (blood pressure, > 160/95 mm Hg)29 were not included. In addition, subjects who had diabetes (fasting plasma glucose level, ≥7.8 mmol per liter, or plasma glucose level two hours after oral glucose administration, ≥11.1 mmol per liter)30 or were taking any medications were excluded. All subjects gave informed consent, and the studies were approved by the ethics committees of the National Institutes of Health, the Indian Health Service, and the Gila River Indian Community.

Experimental Protocol

The subjects were admitted to the clinical research unit for 8 to 15 days and followed a weight-maintenance diet calculated initially on the basis of body weight (50 percent carbohydrate, 30 percent fat, and 20 percent protein). The number of calories in the diet was adjusted according to fasting weight measured each morning. The percentage of body fat and fat-free mass were determined by underwater weighing.31

Blood Pressure

Blood pressure was measured twice by a nurse with a random-zero sphygmomanometer (Hawksley and Sons, Lancing, Sussex, United Kingdom) between 1:30 and 2:30 p.m. on three days with the subjects sitting. The subjects were asked not to drink caffeine-containing beverages or eat for one hour before the measurements. Systolic and diastolic blood pressures were measured at the time of the first and fifth Korotkoff sounds, respectively. The average of the six measurements was taken as the subject's blood-pressure value. A large blood-pressure cuff was used when appropriate. The pulse rate was recorded before each blood-pressure measurement.

Oral Glucose-Tolerance Test

A minimum of three days after admission, an oral glucose-tolerance test with a 75-g glucose-equivalent carbohydrate load was performed after an overnight fast. Venous blood samples were collected for the determination of plasma glucose and insulin concentrations at – 15, 0, 30, 60, 120, and 180 minutes. The mean of the samples obtained at – 15 and 0 minutes was taken as the fasting concentration of both glucose and insulin.

Euglycemic—Hyperinsulinemic Clamp

After 7 to 14 days, a two-step euglycemic—hyperinsulinemic clamp technique was performed after an overnight fast of 10 to 12 hours as previously described.31 At 6 a.m. an intravenous catheter was placed in an antecubital vein for the infusion of insulin, glucose, and [3–3H]glucose. Another catheter was placed retrogradely in a dorsal vein of the contralateral hand for the withdrawal of blood. The hand was kept in a warming box at 70°C A primed continuous infusion of [3–3H]glucose was begun and continued throughout the first (low-dose) insulin infusion. Two hours after the infusion of [3–3H]glucose was begun, a primed continuous infusion (40 mU per square meter of body-surface area per minute) of purified porcine insulin (Velosulin, Nordisk, Bethesda, Md.) was started. Five minutes later, an infusion of 20 percent glucose was begun to maintain the plasma glucose concentration at approximately the basal level. One hundred minutes after the start of the first insulin infusion, a second primed continuous infusion of insulin (400 mU per square meter per minute) was started and continued for another 100 minutes. The mean (±SE) plasma glucose and insulin concentrations were 5.2±0.02 mmol per liter and 814±18 pmol per liter during the low-dose insulin infusion and 5.2±0.02 mmol per liter and 14,803±233 pmol per liter during the high-dose insulin infusion, respectively, and were similar in the three groups. The coefficients of variation of plasma glucose and insulin concentrations during the insulin infusions were calculated for each subject. The mean coefficients of variation of plasma glucose and insulin concentrations for all the subjects were 2.2±0.1 percent and 6.6±0.5 percent, respectively, during the low-dose insulin infusion and 2.8±0.1 percent and 8.6±0.6 percent, respectively, during the high-dose infusion.

Indirect Calorimetry

One hour before the start of the insulin infusion, a ventilated hood made of clear plastic was placed over the subject's head. Room air was drawn through the hood, and the flow rate was measured by a pneumotachygraph (Gould, Cleveland). A constant fraction of expired air was withdrawn and analyzed for oxygen and carbon dioxide content. The analyzers and flowmeter were connected to a desktop computer (Hewlett—Packard, Palo Alto, Calif.). Integrated calorimetric measurements were made every five minutes beginning one hour before the insulin infusions and continuing throughout the infusions. The subjects were asked to remain motionless and awake during the base-line period and the last 40 minutes of each insulin infusion. The rate of protein oxidation during the test was estimated by measuring the rate of urinary urea production. The rates of carbohydrate and lipid oxidation were calculated with the non-protein respiratory quotient.

Calculations

The rate of appearance of glucose in the plasma and the rate of endogenous glucose production were calculated from plasma [3–3H]glucose-specific activity. Glucose disposal during the low-dose insulin infusion was calculated for each 20-minute interval between 60 and 100 minutes and averaged to estimate the whole-body glucose disposal (expressed as millimoles per minute). Whole-body glucose disposal during the high-dose insulin infusion was calculated similarly during the last 40 minutes (160 to 200 minutes), except that [3–3H]glucose was not measured. The rates of glucose uptake were adjusted for steady-state plasma glucose concentrations during the clamp studies. The method of calculation has been described in detail elsewhere.31 The metabolic rate at rest was determined as the mean energy expenditure during the 40 minutes preceding the insulin infusion. The basal and insulin-stimulated respiratory quotient and substrate use were calculated by averaging the results obtained during the 40 minutes before the insulin infusion was begun and during the last 40 minutes of each insulin-infusion period, as previously described.32

Biochemical Analysis

Plasma glucose concentrations were measured by the glucose oxidase method with a Beckman glucose analyzer (Beckman Instruments, Fullerton, Calif). Plasma insulin concentrations were determined by radioimmunoassay as previously described31; the interassay coefficient of variation was 6 to 8 percent. The tritiated glucose—specific activity was measured after perchloric acid precipitation of plasma proteins, as previously described.31

Statistical Analysis

Statistical analyses were performed with programs of the SAS Institute (Cary, N.C.).33 The logarithms of the plasma glucose and insulin values and whole-body glucose-disposal rates were used in the statistical analyses to normalize the distributions. Linear regression was used to adjust for differences in age, sex, body weight, and percentage of body fat. Comparisons among the groups were performed by analysis of variance. The relations between variables were analyzed by simple correlation and multiple regression (partial correlation). Racial interaction terms were included in the models to evaluate the racial differences in the relations between blood pressure and various metabolic variables. The statistical significance of differences in the slopes of the relations between blood pressure and other variables among the three racial groups was tested by comparing the regression equations that included these interaction terms with those that excluded them.33

Results

Tables 1 and 2Table 2Metabolic Characteristics of the Subjects in the Three Groups.* show the physical and metabolic characteristics of the study subjects. The Pima Indians were more obese, had higher plasma insulin concentrations in a fasting state and after carbohydrate loading, and were more resistant to insulin than the whites and blacks of comparable age and sex, but there was no significant difference in average blood pressure among the three groups.

Systolic and diastolic blood pressure had a similar relation to the various metabolic indexes within each racial group. To simplify the presentation of the results, only the relations between mean blood pressure (calculated as 1/3 systolic pressure + 2/3 diastolic pressure) and metabolic variables are described (Table 3Table 3Simple and Partial Correlations between Mean Blood Pressure and Metabolic Variables.*). The fasting plasma insulin concentration correlated with mean blood pressure in whites (r = 0.41, P = 0.003) but not in Pima Indians (r = 0.03, P = 0.72) or blacks (r = 0.17, P = 0.28). After adjustment for age, sex, body weight, and percentage of body fat, the fasting plasma insulin concentration remained significantly related to mean blood pressure in whites (r = 0.42, P<0.001) but not in the other two groups (Fig. 1Figure 1Relation between Mean Blood Pressure and Fasting Plasma Insulin Concentration (Top Panel) and Insulin-Mediated Glucose Disposal during Low-Dose (Middle Panel) and High-Dose (Bottom Panel) Insulin Infusions in Pima Indians, Whites, and Blacks, after Adjustment for Age, Sex, Body Weight, and Percentage of Body Fat.).

Whole-body glucose disposal during low-dose and high-dose insulin infusions was negatively related to mean blood pressure in whites (r = –0.37 and –0.43, respectively; P<0.01 for each). These relations, however, were insignificant in blacks (r = –0.21, P = 0.19; and r = 0.01, P = 0.93, respectively) and in Pima Indians (r = 0.09, P = 0.36; and r = 0.15, P = 0.11, respectively). After adjustment for age, sex, body weight, and percentage of body fat, whole-body glucose disposal during the low-dose and high-dose insulin infusions remained significantly related to mean blood pressure in whites (r = –0.41 and –0.49, respectively; P<0.01 for each) but not in Pima Indians or blacks (Fig. 1).

The mean metabolic rate at rest was similar in the three groups (Table 2). Independently of age, sex, body weight, and percentage of body fat, the metabolic rate at rest was significantly related to mean blood pressure in whites (r = 0.36, P = 0.01) but not in Pima Indians or blacks (Fig. 2Figure 2Relation between Mean Blood Pressure and Metabolic Rate at Rest in Pima Indians, Whites, and Blacks, after Adjustment for Age, Sex, Body Weight, and Percentage of Body Fat.).

The relations between substrate use and blood pressure differed in the three groups at base line and during the insulin infusions. In Pima Indians and blacks, the respiratory quotient was not related to blood pressure after adjustment for age, sex, body weight, and percentage of body fat. In whites, however, the mean blood pressure was significantly related to the respiratory quotient at base line, during the low-dose insulin infusion, and during the high-dose infusion (r = –0.30, –0.39, and –0.35, respectively; P<0.05 for each). Figure 3Figure 3Relation between Mean Blood Pressure and Respiratory Quotient during High-Dose Insulin Infusion in Pima Indians, Whites, and Blacks, after Adjustment for Age, Sex, Body Weight, and Percentage of Body Fat. shows the relation between mean blood pressure and the respiratory quotient during the high-dose insulin infusion in the three groups.

Discussion

The racial differences demonstrated in this study indicate that positive relations between insulinemia, insulin resistance, and blood pressure are not universal. Three studies1 2 3 reporting a relation between insulin resistance and blood pressure were performed among whites, and a fourth4 among Chinese men in Taiwan. In addition, published data on the relation between the fasting plasma insulin concentration (which correlated strongly with glucose disposal after low doses of insulin [r = –0.55, –0.74, and –0.56, respectively] and high doses of insulin [r = –0.48, –0.48, and –0.52, respectively] in Pima Indians, whites, and blacks) and blood pressure confirm that the relation between insulin resistance and blood pressure varies according to racial group. In agreement with our data, Voors et al.34 found no relation between plasma insulin level and blood pressure in black children from 7 to 15 years of age. Manolio and colleagues21 reported a weak association (r = 0.16) in black men and women 18 to 30 years of age, a relation that became much weaker after adjustment for body-mass index (r = 0.05). Haffner et al.23 found plasma insulin concentrations and blood pressure to be weakly related in Mexican American men (r = 0.3, P<0.001), but not in women (r = 0.1). In addition, Alberti et al.25 reported that the relation between the plasma insulin concentration and blood pressure was very weak and accounted for 1 percent or less of the variance in blood pressure in 5036 subjects belonging to four different ethnic or racial groups in Mauritius: Hindu and Moslem Indians, Chinese, and Creoles. Moreover, results in whites vary in different studies. Whereas Rose et al.10 and Lucas et al.11 reported strong relations between blood pressure and plasma insulin concentrations (r = 0.66, P<0.01; and r = 0.62, P<0.001, respectively), others have reported weaker relations18 19 20 21 , 26 or none.22 , 24

The reason for the interracial and intraracial differences in the relations between insulinemia, insulin resistance, and blood pressure is unclear. It is possible that the sensitivity to the postulated hypertensive effects of insulin varies among ethnic or racial groups and individuals. In addition, the effect of insulin on blood pressure may depend on its interaction with the other humoral, neural, cellular, myocardial, and hemodynamic factors involved in the regulation of blood pressure. These factors have not been studied in Pima Indians, but normotensive blacks are more sensitive to salt,35 secrete less aldosterone,36 and have lower plasma renin activity37 and higher intracellular sodium concentrations38 than normotensive whites.

Alternatively, insulin and blood pressure may not be causally related. Instead, insulin resistance and blood pressure may be linked indirectly through mechanisms of an inherited or acquired nature. A possible link is through the sympathetic nervous system. Enhanced adrenergic tone may lead to increased insulin resistance on the one hand and a rise in blood pressure on the other. Ethnic or racial differences in sympathetic nervous system activity might explain the differences in the relation of insulin resistance to blood pressure. In support of this possibility is our finding of variation in the relation between blood pressure and the metabolic rate at rest, which is in part sympathetically mediated, in the three racial groups (Fig- 2).

A further possibility is that a cellular or structural defect, genetic or acquired, may constitute the link between insulin resistance and blood pressure. Reduced activity of sodium—potassium ATPase,1 decreased intracellular magnesium concentrations,13 and increased sodium–lithium countertransport39 have been proposed as possible links. Racial differences in ion regulation have been described38 and could account for the observed variation in the relation of insulin resistance to blood pressure. Ferrannini and DeFronzo40 postulated, however, that the association of insulin resistance and blood pressure could be a genetic trait related to the type of muscle fiber present.

Finally, since insulin resistance31 and high blood pressure41 each aggregate in families, the conditions may be more likely to occur together in some ethnic or racial groups or persons. Ferrari and Weidmann42 reported that the normotensive offspring of parents with essential hypertension tended to be more resistant to insulin than those whose parents were normotensive. Furthermore, Berntorp and Lindgärde43 found that normoglycemic nonobese middle-aged men with a strong family history of non-insulin-dependent diabetes had significantly higher blood pressure than men without such a family history. Thus, if there were different genes contributing to insulin resistance and high blood pressure on the same chromosome – i.e., linked genes — it is conceivable that they could be in linkage disequilibrium in some racial groups (e.g., whites), resulting in an association of the two conditions, but that equilibrium could have been attained in others (e.g., Pima Indians and blacks), resulting in no association.

In summary, plasma insulin concentrations and insulin resistance are related to blood pressure in whites but not in Pima Indians or blacks. The relation between blood pressure and insulinemia or insulin resistance may be mediated by mechanisms active in whites but not in Pima Indians or blacks. Alternatively, blood pressure may not be causally related to either plasma insulin or insulin resistance. A common mechanism, genetic or acquired, such as enhanced adrenergic tone, or a cellular or structural defect may constitute the link between insulin resistance and blood pressure in whites but not in other racial groups.

We are indebted to the residents of the Gila River Indian Community and the staff of the Indian Health Service for their help and cooperation; to Drs. Idamar Raz, Boyd Swinburn, and Francisco Zurlo for their assistance; to Ms. Carol Lamkin, head nurse of the Clinical Research Unit, for her help; to Ms. Vicky Boyce and the dietary staff for their work; to Mr. James Smart (Nordisk USA) for supplying the insulin; to Ms. Charlene K. Gishie and Ms. Susan Elson for secretarial assistance; and to Daryl Allis, Thomas Anderson, John Brown, Aileen Coyne, Revina Frank, Margie Goldsmith, Inge Harper, Christina Hendricks, Jeanetta Impson, Donna Judd-Padillo, Pat Moulsoff, Harlan Osife, Victoria Ossowski, Vera Rodriguez, Donna Rush, Joy Seumptewa, Karen Stone, Pam Thuillez, Dorothy Wilier, and Debbie Wolfe-Lopez for technical and nursing assistance.

Source Information

From the Phoenix Epidemiology and Clinical Research Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Ariz. (M.F.S., S.L., B.L.N., C.C., R.F., M.D.G., E.R., W.C.K., P.H.B., C.B.), and Medlantic Research Foundation, Washington, D.C. (B.V.H.). Address reprint requests to Dr. Saad at DAES, 1550 E. Indian School Rd., Phoenix, AZ 85014.

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