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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
Vitamins01:30

Vitamins

Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
Mineral, Vitamin and Water Absorption01:27

Mineral, Vitamin and Water Absorption

Electrolytes are essential minerals and ions primarily obtained from the diet and absorbed through the gastrointestinal tract. Most electrolytes are absorbed in the small intestine. While the absorption of iron and calcium primarily occurs in the duodenum, calcium is also absorbed in the jejunum and ileum. In these regions, passive diffusion contributes to its absorption alongside active transport mechanisms in the duodenum. These ions can exit the enterocytes through specialized active...
Compounds Essential to Human Function01:25

Compounds Essential to Human Function

The human body is composed of cells that are fundamentally made up of several different molecules. These molecules are essential to carry out all physiological processes in the body and are broadly classified into organic and inorganic based on their chemical structures.
Inorganic Compounds Essential to Human Functioning
Inorganic compounds essential to human functioning include water, salts, acids, and bases. These compounds are inorganic, i.e., they do not have a carbon-hydrogen bond. Water...
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...
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...

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Related Experiment Video

Updated: Jun 28, 2026

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
08:03

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Published on: June 11, 2017

Supplements and sports.

David M Jenkinson1, Allison J Harbert

  • 1Department of Family Medicine, University of Tennessee College of Medicine-Chattanooga Unit, Chattanooga, Tennessee, USA.

American Family Physician
|November 15, 2008
PubMed
Summary
This summary is machine-generated.

Many sports supplements lack proven benefits and pose risks. Some, like caffeine and creatine, offer performance enhancement with few side effects, while others are banned due to serious health concerns.

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Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon

Published on: October 29, 2021

Related Experiment Videos

Last Updated: Jun 28, 2026

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model
08:03

Treatment of Ligament Constructs with Exercise-conditioned Serum: A Translational Tissue Engineering Model

Published on: June 11, 2017

Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon
04:54

Assessing Mineral Availability in Fish Feeds using Complementary Methods Demonstrated with the Example of Zinc in Atlantic Salmon

Published on: October 29, 2021

Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Nutritional Science

Background:

  • Performance-enhancing supplement use is prevalent across all athletic levels, from professionals to adolescents.
  • While some supplements demonstrably improve athletic performance, many lack evidence of efficacy and carry significant health risks.
  • Understanding the varied effects and safety profiles of these substances is crucial for athlete well-being.

Purpose of the Study:

  • To review the effectiveness and safety of commonly used performance-enhancing supplements in sports.
  • To identify supplements with proven benefits versus those with no demonstrated performance enhancement.
  • To highlight substances with serious adverse effects and those prohibited by major sports organizations.

Main Methods:

  • Literature review and synthesis of scientific evidence on various performance-enhancing supplements.
  • Categorization of supplements based on proven efficacy, potential adverse effects, and regulatory status.
  • Analysis of data regarding specific compounds such as anabolic steroids, caffeine, creatine, and others.

Main Results:

  • Anabolic steroids and ephedrine are associated with life-threatening adverse effects and are banned by the International Olympic Committee (IOC) and National Collegiate Athletic Association (NCAA).
  • Caffeine, creatine, and sodium bicarbonate show performance benefits in specific situations with minimal adverse effects.
  • Amino acids, beta-hydroxy-beta-methylbutyrate, chromium, human growth hormone, and iron have not demonstrated performance benefits.
  • Carbohydrate-electrolyte beverages are safe for hydration and can aid performance.

Conclusions:

  • Athletes use a wide array of performance-enhancing supplements, necessitating informed guidance.
  • Physicians must be prepared to counsel athletes on the efficacy, safety, and legal status of supplements.
  • Distinguishing between beneficial, ineffective, and dangerous supplements is critical for athlete health and fair competition.