Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

4.9K
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...
4.9K
Stimulants01:29

Stimulants

1.2K
Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
1.2K
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

4.7K
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...
4.7K
Energy Supply for Muscle Contraction01:25

Energy Supply for Muscle Contraction

6.1K
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,...
6.1K
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

2.9K
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...
2.9K
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

9.1K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
9.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Novel heterozygous mutations in the <i>PGAM2</i> gene with negative exercise testing.

Molecular genetics and metabolism reports·2018
Same author

Utility of whole-exome sequencing for those near the end of the diagnostic odyssey: time to address gaps in care.

Clinical genetics·2015
Same author

Combined aerobic exercise and enzyme replacement therapy rejuvenates the mitochondrial-lysosomal axis and alleviates autophagic blockage in Pompe disease.

Free radical biology & medicine·2015
Same author

Novel GAA sequence variant c.1211 A>G reduces enzyme activity but not protein expression in infantile and adult onset Pompe disease.

Gene·2014
Same author

The effect of endurance exercise on both skeletal muscle and systemic oxidative stress in previously sedentary obese men.

Nutrition & diabetes·2013
Same author

Resistance exercise enhances myofibrillar protein synthesis with graded intakes of whey protein in older men.

The British journal of nutrition·2012
Same journal

Injury surveillance during the 2024 under 20s Men's European Field Lacrosse Championships.

The Physician and sportsmedicine·2026
Same journal

Understanding health insurance and the delay in care for partial meniscectomies: a comparison between public and private coverage.

The Physician and sportsmedicine·2026
Same journal

Injury incidence and risk factors in youth American football versus soccer: a national emergency department analysis.

The Physician and sportsmedicine·2026
Same journal

Links between concussion history, hypertension, and hypertension contributing factors among adolescent football athletes.

The Physician and sportsmedicine·2026
Same journal

Core muscle endurance and balance as predictors of lateral ankle sprain in adolescent team-sport athletes: a prospective cohort study.

The Physician and sportsmedicine·2026
Same journal

Impact of Achilles tendon rupture on performance and career outcomes in NFL players: a matched cohort study.

The Physician and sportsmedicine·2026
See all related articles

Related Experiment Video

Updated: Mar 17, 2026

Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions
09:11

Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions

Published on: October 2, 2018

13.5K

Protein, Caffeine, and Sports.

M A Tarnopolsky

    The Physician and Sportsmedicine
    |July 21, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Active individuals need more protein, with endurance and resistance athletes benefiting from higher intake. Caffeine enhances endurance but not power or resistance sports performance.

    More Related Videos

    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

    42.6K
    Human Skeletal Muscle Biopsy Procedures Using the Modified Bergstr&#246;m Technique
    07:20

    Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique

    Published on: September 10, 2014

    44.2K

    Related Experiment Videos

    Last Updated: Mar 17, 2026

    Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions
    09:11

    Caffeine Extraction, Enzymatic Activity and Gene Expression of Caffeine Synthase from Plant Cell Suspensions

    Published on: October 2, 2018

    13.5K
    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

    42.6K
    Human Skeletal Muscle Biopsy Procedures Using the Modified Bergstr&#246;m Technique
    07:20

    Human Skeletal Muscle Biopsy Procedures Using the Modified Bergström Technique

    Published on: September 10, 2014

    44.2K

    Area of Science:

    • Sports Nutrition
    • Exercise Physiology

    Background:

    • Optimal protein intake is crucial for active individuals, particularly athletes.
    • The ergogenic effects of caffeine on athletic performance are widely studied.

    Purpose of the Study:

    • To determine optimal protein intake for endurance and resistance athletes.
    • To evaluate the impact of caffeine on different types of athletic performance.

    Main Methods:

    • Review of substantial scientific evidence regarding protein requirements.
    • Analysis of research on caffeine's ergogenic effects in various sports.

    Main Results:

    • Endurance athletes require 50-100% more protein than sedentary individuals.
    • Resistance athletes have similar protein needs to endurance athletes.
    • Caffeine demonstrates ergogenic benefits in prolonged endurance exercise.
    • No evidence supports caffeine improving performance in resistance or power sports.

    Conclusions:

    • Athletes should aim for higher protein intake, but excessive supplementation offers no additional benefit.
    • Caffeine is beneficial for endurance activities but not for resistance or power-based sports.