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Related Concept Videos

Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
ATP Energy Storage and Release01:31

ATP Energy Storage and Release

ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
ATP Energy Storage and Release01:31

ATP Energy Storage and Release

ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
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...
Energy Budgets00:51

Energy Budgets

Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...

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Determining the Contribution of the Energy Systems During Exercise
11:15

Determining the Contribution of the Energy Systems During Exercise

Published on: March 20, 2012

Energy availability in athletes.

Anne B Loucks1, Bente Kiens, Hattie H Wright

  • 1Department of Biological Sciences, Ohio University, Athens, Ohio 45701, USA. loucks@ohio.edu

Journal of Sports Sciences
|July 29, 2011
PubMed
Summary
This summary is machine-generated.

Energy availability is key for athletes. This review highlights how low energy availability impacts athletes and why appetite regulation is crucial for managing sports nutrition and preventing health issues.

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Area of Science:

  • Sports Nutrition
  • Exercise Physiology
  • Human Metabolism

Background:

  • The 2003 IOC Consensus Conference reviewed energy balance and body composition in athletes.
  • Recent research indicates low energy availability is prevalent and consequential in athletes.
  • Appetite regulation's role in energy intake compensation for exercise is under investigation.

Purpose of the Study:

  • To update and complement previous reviews on energy balance and body composition in athletes.
  • To emphasize the utility of energy availability over energy balance for athlete diet management.
  • To summarize recent findings on low energy availability and appetite regulation in athletes.

Main Methods:

  • Literature review of recent scientific reports and research.
  • Synthesis of evidence regarding the causes and consequences of low energy availability.
  • Analysis of studies on appetite response to exercise energy expenditure.

Main Results:

  • Energy availability is a more practical concept than energy balance for managing athlete diets.
  • Low energy availability has identifiable causes and significant clinical consequences in athletes.
  • Athletes' appetite often fails to adequately compensate for energy expended during exercise.

Conclusions:

  • Managing energy availability is critical for athlete health and performance.
  • Understanding appetite regulation is essential for effective sports nutrition strategies.
  • Further research is needed to optimize dietary interventions for athletes experiencing low energy availability.