The role of gas analysis in stress testing
Related Experiment Video
Updated: Nov 2, 2026

Investigating Stress-relaxation and Failure Responses in the Trachea
Published on: October 18, 2022
1Department of Medicine, Duke University Medical Center, Durham, North Carolina.
Abstract:
By providing measurements of O2 uptake and CO2 production during exercise, cardiopulmonary exercise testing can (1) distinguish between cardiac and pulmonary limitations in patients with dyspnea; (2) measure disability and provide an accurate exercise prescription; (3) provide physiologically relevant endpoints for assessing interventions; (4) define low-risk patients after uncomplicated myocardial infarction who may be safely assigned to medical therapy; and (5) stratify patient with left ventricular dysfunction by prognosis and functional capacity, identifying those who may benefit most from cardiac transplantation.
Related Concept Videos
Exercise Stress Test
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
Stress-Strain Diagram
Stress: General Loading Conditions
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Assessment of Diffusion and Perfusion
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Components of Stress
Interestingly, the hidden cube faces also experience these stresses, equal and opposite to those on the...
True Stress and True Strain
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
