Epidemiology of Blood Pressure, Insulin, Salt Transport

NCT ID: NCT00005249

Last Updated: 2016-05-13

Basic Information

• Recruitment Status: COMPLETED
• Study Classification: OBSERVATIONAL
• Study Start Date: 1989-09-30
• Study Completion Date: 1991-08-31

Brief Summary

To determine the roles of insulin, lipids, body weight and ion transport in blood pressure regulation.

Detailed Description

BACKGROUND:

Insulin levels are consistently related to blood pressure, obesity, and blood lipids. Insulin level correlation with sodium-lithium countertransport is limited to only one available study done in white, normotensive, predominantly normal weight women aged 45-52. The relationship between cellular sodium-hydrogen exchange activity and hypertension has been studied in rats and in a small study in humans. Correlation of this transport with weight, fasting insulin and lipid levels, and sodium-lithium countertransport was not available in 1989.

DESIGN NARRATIVE:

The study was cross-sectional. Subjects were stratified by weight: plus or minus 10 percent of desirable weight; 11 to 30 percent over desirable weight; and 30 percent over desirable weight; and by diastolic blood pressure: 80; 80-89; 90-99 mmHg. Blood pressure, height, weight, waist and hip girth, skinfold, fasting and post-glucose load insulin, glucose, lipids, creatinine, maximal rates of red blood cell sodium-lithium countertransport and platelet sodium-hydrogen exchange, pH, and calcium concentrations were measured. The strength and independence among these continuous variables were measured by Pearson correlations, partial correlations, and multiple regressions within each stratum, and if appropriate, over all strata. The study examined the hypotheses that: part of the relationship between obesity and blood pressure was due to insulin effects and/or lipid effects on ion transport; the relationship between ion transport and blood pressure was related to an abnormality of sodium-hydrogen exchange, for which the observed increase in sodium-lithium countertransport was a marker; increased blood pressure was related to the alteration of intracellular pH and/or calcium concentration.

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

Conditions

Cardiovascular Diseases; Heart Diseases; Hypertension; Obesity

Eligibility Criteria

Inclusion Criteria

No eligibility criteria

• Maximum Eligible Age: 100 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

National Heart, Lung, and Blood Institute (NHLBI)

NIH

Sponsor Role: lead

References

Bunker CH, Wing RR, Becker DJ, Kuller LH. Sodium-lithium countertransport activity is decreased after weight loss in healthy obese men. Metabolism. 1993 Aug;42(8):1052-8. doi: 10.1016/0026-0495(93)90022-g.

Reference Type: BACKGROUND

PMID: 8345810 (View on PubMed)

Other Identifiers

R01HL039748

Identifier Type: NIH

Identifier Source: secondary_id

View Link

1131

Identifier Type: -

Identifier Source: org_study_id