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Related Concept Videos

Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Chronic Obstructive Pulmonary Disease01:24

Chronic Obstructive Pulmonary Disease

COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
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...
Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...

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Updated: Jun 27, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Airflow obstruction and exercise.

Christopher B Cooper1

  • 1David Geffen School of Medicine, University of California, Los Angeles, USA. ccooper@mednet.ucla.edu

Respiratory Medicine
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Chronic obstructive pulmonary disease (COPD) involves airway inflammation, leading to airflow limitation and hyperinflation. Physical inactivity and deconditioning are key features, making exercise a crucial therapeutic target.

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Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

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Last Updated: Jun 27, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology

Background:

  • Chronic obstructive pulmonary disease (COPD) is characterized by chronic airway inflammation and airflow limitation.
  • Progressive static and dynamic hyperinflation are key pathophysiological features in COPD patients.
  • Physical inactivity and deconditioning are significant comorbidities associated with COPD progression and mortality.

Purpose of the Study:

  • To elucidate the multifaceted nature of COPD, focusing on hyperinflation, activity limitation, and physical deconditioning.
  • To highlight physical inactivity as a critical therapeutic target in COPD management.
  • To review current and potential therapeutic interventions for COPD, including bronchodilators, exercise, and resistance training.

Main Methods:

  • Review of pathophysiological mechanisms in COPD, including airway inflammation, hyperinflation, and lung mechanics.
  • Analysis of patient activity levels and aerobic capacity (VO(2)max) in relation to disease progression.
  • Evaluation of therapeutic strategies targeting airflow obstruction, physical deconditioning, and skeletal muscle dysfunction.

Main Results:

  • COPD progression is marked by accelerated decline in FEV(1), progressive hyperinflation, and significant activity limitation.
  • Reduced aerobic capacity (VO(2)max) in COPD patients correlates with mortality.
  • Physical inactivity is a major determinant of the COPD phenotype and a critical therapeutic target.

Conclusions:

  • Airflow obstruction drives hyperinflation, activity limitation, and deconditioning, defining the COPD phenotype.
  • Long-acting bronchodilators combined with supervised exercise are effective for early COPD.
  • Resistance training and anabolic supplementation may address skeletal muscle dysfunction in COPD.