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 Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be met...
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...
Exercise Stress Test01:26

Exercise Stress Test

Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...

You might also read

Related Articles

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

Sort by
Same author

Moderate altitude-mimicking CO-induced inhibition of hemoglobin oxygen binding decreased middle-distance swimming speed in male national-level swimmers.

European journal of applied physiology·2026
Same author

Long-Distance Trail Running Induces Inflammatory-Associated Protein, Lipid, and Purine Oxidation in Red Blood Cells.

Blood. Red cells & iron·2026
Same author

Limited reproducibility of individual physiological adaptations to repeated endurance exercise training.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same author

Did You Know: Erythropoiesis Is Regulated by Changes in Posture.

Acta physiologica (Oxford, England)·2026
Same author

Editorial: SJMSS Paper of the Year 2024.

Scandinavian journal of medicine & science in sports·2026
Same author

Effectiveness and Safety of Interventions for Sarcopenia in Advanced Prostate Carcinoma: Systematic Review.

Journal of cachexia, sarcopenia and muscle·2026

Related Experiment Video

Updated: Jun 19, 2026

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine
12:37

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

Published on: February 9, 2016

The exercising heart at altitude.

José A L Calbet1, Paul Robach, Carsten Lundby

  • 1Department of Physical Education, University of Las Palmas de Gran Canaria, Campus Universitario de Tafira, 35017, Las Palmas de Gran Canaria, Canary Islands, Spain. lopezcalbet@gmail.com

Cellular and Molecular Life Sciences : CMLS
|October 8, 2009
PubMed
Summary
This summary is machine-generated.

Maximal cardiac output decreases in both acute and chronic hypoxia due to poorly understood mechanisms affecting heart pumping capacity. This review explores hypoxia

Related Experiment Videos

Last Updated: Jun 19, 2026

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine
12:37

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

Published on: February 9, 2016

Area of Science:

  • Cardiovascular Physiology
  • Environmental Medicine
  • Molecular Cardiology

Background:

  • Maximal cardiac output (CO) is impaired in severe acute and chronic hypoxia.
  • Mechanisms underlying reduced maximal CO in hypoxia are not fully elucidated.
  • Potential causes include central nervous system regulation, cardiac pumping capacity, and central command.

Purpose of the Study:

  • To review the impact of acute and chronic hypoxia on cardiac pumping capacity.
  • To examine myocardial contractility and molecular responses in cardiac myocytes.
  • To emphasize the cardioprotective aspects of chronic hypoxia.

Main Methods:

  • Literature review focusing on studies investigating hypoxia and cardiac function.
  • Analysis of molecular and physiological adaptations in cardiac myocytes.
  • Synthesis of current understanding regarding cardiac output limitations in hypoxia.

Main Results:

  • Hypoxia significantly affects myocardial contractility and cardiac output.
  • Both acute and chronic hypoxia induce distinct molecular responses in cardiac myocytes.
  • Chronic hypoxia may confer cardioprotective effects despite reduced maximal CO.

Conclusions:

  • Understanding hypoxia's effects on cardiac contractility is crucial.
  • Molecular adaptations in cardiac myocytes play a key role in response to hypoxia.
  • Chronic hypoxia presents complex effects, including potential cardioprotection.