Obesity is associated with impaired endothelial function in the postprandial state
Amy M Jonk1, Alfons J Houben, Nicolaas C Schaper
1Department of Internal Medicine, Maastricht University Medical Centre and Cardiovascular Research Institute Maastricht, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands. a.jonk@maastrichtuniversity.nl
Microvascular Research
|August 31, 2011
Summary
Obesity impairs microvascular function after meals, reducing blood flow and vasodilation. This suggests a link between obesity, poor post-meal microvascular response, and insulin resistance.
Area of Science:
- Physiology
- Metabolism
- Cardiovascular Science
Background:
- Microvascular perfusion is crucial for tissue metabolism.
- Obesity is linked to insulin resistance, potentially due to microvascular dysfunction.
- Insulin stimulates vasodilation and capillary recruitment, enhancing glucose uptake, but this is blunted in obesity.
Purpose of the Study:
- To investigate postprandial microvascular responses to meals in lean and obese individuals.
- To determine if meal ingestion affects skin capillary density and vasodilation.
- To compare microvascular function after meals between lean and obese subjects.
Main Methods:
- Assessed skin capillary density (capillaroscopy) and vasodilation (laser-Doppler flowmetry) after consuming glucose, mixed meal, or control drinks.
- Used iontophoresis of acetylcholine and sodium nitroprusside to assess endothelium-dependent and independent vasodilation.
- Studied 20 lean and 19 obese individuals.
Main Results:
- In obese individuals, a mixed meal reduced skin perfusion and acetylcholine-mediated vasodilation compared to controls.
- No significant changes in capillary density were observed in either group after any drink.
- Obese individuals exhibited impaired acetylcholine-mediated vasodilation post-meal compared to lean individuals.
Conclusions:
- Meal ingestion reveals impaired postprandial microvascular function in obese individuals.
- Obesity is associated with reduced endothelium-dependent vasodilation after a mixed meal.
- These findings support the role of impaired microvascular function in obesity-related metabolic disturbances.
Related Concept Videos
01:24Obesity
The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...
01:25Pharmacokinetics in Obese Patients: Drug Absorption and Distribution
Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
01:24Type II Diabetes II: Pathophysiology
PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
01:30Coronary Artery Disease I: Introduction
Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
01:20Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion
Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...
01:21Drug Dosing: Obese Patients
In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...