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Related Concept Videos

Direct-Acting Cholinergic Agonists: Therapeutic Uses01:11

Direct-Acting Cholinergic Agonists: Therapeutic Uses

Direct-acting cholinergic agonists have many therapeutic uses in various medical fields. Choline esters, including acetylcholine, have limited clinical utility due to their non-selectivity and short duration of action. Still, acetylcholine and carbachol are applied topically during ophthalmologic surgery to induce miosis. Pilocarpine, a muscarinic and ganglionic stimulator, effectively treats open-angle glaucoma and alleviates xerostomia and dry mouth caused by radiotherapy or Sjögren syndrome.
Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists01:30

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...
Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and anaphylaxis:...
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...
Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
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...

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Related Experiment Video

Updated: Jun 16, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

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Published on: May 26, 2020

Ergogenic Aids: What Athletes Are Using-and Why.

E R Eichner1

  • 1Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73190, USA.

The Physician and Sportsmedicine
|January 21, 2010
PubMed
Summary

Athletes use various ergogenic aids, with some like testosterone and growth hormone being abused. Caffeine and creatine show potential benefits for athletic performance, but questions remain about others.

Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Pharmacology

Background:

  • Athletes at all levels investigate ergogenic aids to enhance performance.
  • The use and detection of banned substances like testosterone and growth hormone remain challenges.
  • Certain medications, like albuterol and salmeterol, are explored for performance enhancement.

Purpose of the Study:

  • To review the ergogenic potential of various substances used by athletes.
  • To discuss the implications of ergogenic aid use for athletes, physicians, and society.

Main Methods:

  • Literature review of studies on ergogenic aids.
  • Analysis of the effects of specific substances on athletic performance.

Main Results:

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Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
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An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field

Published on: May 26, 2020

Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique
07:20

Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique

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  • Single doses of albuterol and salmeterol do not appear ergogenic, but long-term effects and other beta2 agonists require further study.
  • Caffeine demonstrates ergogenic effects for both prolonged and brief exertion.
  • Creatine supplementation, while legal and popular, shows ergogenic benefits for repeated high-intensity exercise, though research is not entirely consistent.

Conclusions:

  • Ergogenic aids present complex issues for the athletic community, medical professionals, and society.
  • Further research is needed to clarify the efficacy and safety of many ergogenic aids.
  • The ethical and practical considerations of ergogenic aid use require ongoing discussion.