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Related Concept Videos

Overview of Carbohydrate Metabolism01:19

Overview of Carbohydrate Metabolism

Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
Glucose transport into cells is facilitated by a family of transport proteins called GLUT (Glucose Transporters). GLUT4 is the primary glucose transporter for insulin-stimulated glucose...
Introduction to Carbohydrates01:34

Introduction to Carbohydrates

Carbohydrates, proteins, and fats are the primary macronutrients in the human diet. However, carbohydrates are the most favored source of energy in the body. They can be found in a wide variety of foods, including whole grains, fruit, and vegetables, in various forms, such as sugars, starch, and dietary fiber. Based on their structure, carbohydrates are classified into three main classes— monosaccharides, disaccharides, and polysaccharides. The body's cells can only utilize simple...
Carbohydrates: Dietary Sources and Requirements01:15

Carbohydrates: Dietary Sources and Requirements

Carbohydrates are predominantly obtained from plant sources. With the exception of lactose found in milk and insignificant glycogen amounts in meat, most consumed carbohydrates have plant origins. Monosaccharides and disaccharides, or sugars, can be sourced from fruits, honey, milk, sugar cane, and sugar beets. Grains and vegetables are rich in the polysaccharide starch. Two types of polysaccharides provide fiber: cellulose, which is abundant in many vegetables, forms undigestible roughage or...
Carbohydrate Metabolism01:36

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...
Carbohydrate Metabolism01:36

Carbohydrate Metabolism

Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories of energy, which makes it the most efficient instant energy source.
Starch accounts for approximately 60% of the carbohydrates consumed by humans. Since amylase enzymes cannot function in the stomach's acidic environment, starch can only be digested in the mouth and small intestine. Simple sugars are found naturally in milk and fruits in the...
What are Carbohydrates?01:44

What are Carbohydrates?

Overview

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Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans
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Published on: June 2, 2023

The latest on carbohydrate loading: a practical approach.

Darlene A Sedlock1

  • 1Wastl Human Performance Laboratory, Purdue University, Department of Health and Kinesiology, W. Lafayette, Indiana 47907-2046, USA. sedlock@purdue.edu

Current Sports Medicine Reports
|July 9, 2008
PubMed
Summary

Carbohydrate (CHO) loading before endurance events enhances muscle glycogen and performance. Athletes should focus on adequate CHO intake, with specific considerations for women and short-term loading protocols.

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Area of Science:

  • Sports Nutrition
  • Exercise Physiology
  • Biochemistry

Background:

  • High carbohydrate intake, known as carbohydrate loading, augments muscle glycogen stores.
  • This strategy is associated with performance benefits in endurance events exceeding 90 minutes.
  • Existing carbohydrate-loading protocols offer flexibility in dietary manipulation and exercise integration.

Purpose of the Study:

  • To review carbohydrate-loading strategies for athletes.
  • To highlight specific considerations for female athletes regarding energy and carbohydrate intake.
  • To discuss the impact of carbohydrate type and glycemic index on loading protocols.

Main Methods:

  • Review of existing literature on carbohydrate-loading protocols.
  • Analysis of recommended carbohydrate intake levels for athletes.
  • Examination of factors influencing glycogen storage and maintenance.

Main Results:

  • Carbohydrate loading effectively increases muscle glycogen stores, potentially for up to 5 days.
  • Female athletes require specific attention to total energy and carbohydrate intake, with recommendations exceeding 8 g/kg body mass/day or 10 g/kg lean body mass/day.
  • The type of carbohydrate is generally less critical than the total amount, except in 1-day loading protocols where glycemic index may play a role.

Conclusions:

  • Carbohydrate loading is a viable strategy to enhance athletic performance through increased glycogen stores.
  • Flexible application of carbohydrate-loading protocols allows for individual athlete tailoring.
  • Specific intake guidelines are crucial, particularly for female athletes, and the glycemic index is a consideration for short-duration loading.