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Related Concept Videos

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...
Sugars as Energy Storage Molecules01:10

Sugars as Energy Storage Molecules

Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
Sugars as Energy Storage Molecules01:10

Sugars as Energy Storage Molecules

Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
Dietary Connections01:23

Dietary Connections

In biological systems, most metabolic pathways are interconnected. The cellular respiration processes that convert glucose to ATP—such as glycolysis, pyruvate oxidation, and the citric acid cycle—tie into those that break down other organic compounds. As a result, various foods—from apples to cheese to guacamole—end up as ATP. In addition to carbohydrates, food also contains proteins and lipids—such as cholesterol and fats. All of these organic compounds are used as energy sources to produce...
What are Carbohydrates?01:44

What are Carbohydrates?

Overview
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...

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Carbohydrates for training and competition.

Louise M Burke1, John A Hawley, Stephen H S Wong

  • 1Department of Sports Medicine, Australian Institute of Sport, Belconnen, ACT, Australia. louise.burke@ausport.gov.au

Journal of Sports Sciences
|June 11, 2011
PubMed
Summary

Optimizing athlete carbohydrate intake ensures adequate fuel for muscles and the central nervous system. Proper timing and amounts during and after exercise are key for performance, especially in high-intensity training and competition.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Carbohydrate availability is crucial for athletic performance, influencing muscle and central nervous system function.
  • Adequate carbohydrate intake, timed appropriately around exercise, supports optimal energy substrate levels.
  • Athletes experience varying carbohydrate availability during training and competition.

Purpose of the Study:

  • To review the impact of carbohydrate intake timing and quantity on athletic performance.
  • To discuss carbohydrate availability strategies for different exercise durations and intensities.
  • To explore the potential benefits and uncertainties of 'train-low' strategies.

Main Methods:

  • Literature review of studies on carbohydrate intake and exercise performance.
  • Analysis of recommended carbohydrate intake guidelines based on exercise duration.
  • Discussion of physiological mechanisms linking carbohydrate availability to performance.

Main Results:

  • High carbohydrate availability, achieved through strategic intake before, during, and after exercise, enhances performance.
  • Carbohydrate intake during exercise recommendations vary: ~1 hour events benefit from small amounts (mouth-rinsing), 1-2.5 hours require 30-60 g/h, and >2.5 hours may need up to 90 g/h.
  • The efficacy of 'train-low' strategies for improving long-term performance adaptations in well-trained athletes remains uncertain.

Conclusions:

  • Strategic carbohydrate consumption is vital for maximizing athletic performance, particularly in high-intensity and prolonged events.
  • Tailoring carbohydrate intake to exercise characteristics is essential for optimizing fuel availability.
  • Further research is needed to clarify the benefits of 'train-low' protocols for elite athletes.