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Related Concept Videos

Metabolic States of the Body: The Postabsorptive State01:18

Metabolic States of the Body: The Postabsorptive State

The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Metabolic States of the Body: The Absorptive State01:25

Metabolic States of the Body: The Absorptive State

During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
Metabolic States of the Body: Fasting and Starvation01:24

Metabolic States of the Body: Fasting and Starvation

During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
During fasting, when blood glucose levels are low, the pancreas secretes glucagon. it...
Hormones Regulating Blood Glucose01:16

Hormones Regulating Blood Glucose

Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
In addition to accelerating glucose uptake and utilization, insulin has...

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Related Experiment Video

Updated: May 10, 2026

Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization
04:28

Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization

Published on: May 18, 2018

Metabolic responses during postprandial exercise.

Jie Kang1, Emily Raines, Joseph Rosenberg

  • 1Human Performance Laboratory, Department of Health and Exercise Science, The College of New Jersey, Ewing, New Jersey 08628, USA. kang@tcnj.edu

Research in Sports Medicine (Print)
|June 20, 2013
PubMed
Summary
This summary is machine-generated.

Combining a meal with mild-intensity exercise increases the body's energy expenditure. Postprandial exercise potentiates meal-induced thermogenesis, leading to a greater metabolic response than exercise or meals alone.

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Area of Science:

  • Exercise Physiology
  • Nutritional Metabolism
  • Human Metabolism

Background:

  • Understanding the interplay between food intake and physical activity is crucial for energy balance.
  • Meal-induced thermogenesis (MIT) represents the energy expended during digestion and absorption.
  • The impact of exercise timing relative to meals on metabolic rate requires further investigation.

Purpose of the Study:

  • To investigate the metabolic interaction between meal consumption and subsequent exercise.
  • To determine if postprandial exercise affects meal-induced thermogenesis (MIT).
  • To quantify the impact of mild-intensity exercise on energy expenditure after a meal.

Main Methods:

  • 10 men and 10 women underwent three trials: exercise only (E), meal consumption only (M), and meal followed by exercise (M+E).
  • Resting metabolic rate (RMR) was measured after an overnight fast.
  • Oxygen consumption (VO2) was measured to calculate MIT during cycling at 50%, 60%, and 70% VO2peak, starting 60 minutes post-meal.

Main Results:

  • Oxygen consumption (VO2) was significantly higher in the M+E trial compared to the E trial at 50% and 60% VO2peak.
  • Meal-induced thermogenesis (MIT) was significantly elevated during exercise at 50% VO2peak compared to rest.
  • Postprandial exercise at mild intensities appears to enhance overall energy expenditure.

Conclusions:

  • Postprandial exercise, particularly at mild intensities (50% VO2peak), can enhance meal-induced thermogenesis.
  • Combining a meal with subsequent mild exercise increases total energy expenditure.
  • This suggests a synergistic effect between nutrient intake and exercise on metabolic rate.