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Related Concept Videos

Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Respiratory Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
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...
Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
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Ventilatory Modes01:14

Ventilatory Modes

Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...

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Related Experiment Video

Updated: Jul 9, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Ventilatory control during intermittent high-intensity exercise in humans.

Andrew J Cathcart1, Anthony P Turner, Christopher Butterworth

  • 1University of Glasgow, Institute of Biomedical & Life Sciences. A.Cathcart@bio.gla.ac.uk

Advances in Experimental Medicine and Biology
|December 19, 2007
PubMed
Summary

High-intensity exercise triggers metabolic acidosis. Respiratory compensation (RC) kinetics were studied using intermittent cycling. Longer work intervals delayed RC, suggesting chemoreceptor signal transduction influences exercise response.

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Published on: March 15, 2019

Area of Science:

  • Exercise Physiology
  • Respiratory Control
  • Metabolic Acidosis

Background:

  • High-intensity exercise (> lactate threshold) induces metabolic acidosis.
  • Understanding the kinetics of respiratory compensation (RC) is crucial for exercise physiology.
  • Previous studies explored RC during step and ramp exercise.

Purpose of the Study:

  • To investigate the kinetics of respiratory compensation during intermittent supra-maximal cycling with varying work:recovery durations.
  • To determine the influence of duty-cycle length on metabolic acidosis and respiratory responses.
  • To evaluate the consistency of findings with existing models of central command and neurogenesis.

Main Methods:

  • Intermittent supra-maximal cycling with varying work:recovery ratios (e.g., 10s:20s, 30s:60s, 60s:120s, 90s:180s).
  • Measurement of blood lactate concentration ([L-]).
  • Analysis of ventilation (VE), CO2 output (Vco2), VE-Vco2 slope, and end-tidal PCO2 (PETCO2) to assess respiratory compensation.

Main Results:

  • Short duty-cycles (10s:20s) did not increase blood lactate or show evidence of respiratory compensation.
  • Longer duty-cycles led to elevated blood lactate, with stabilization or progressive rise depending on duration.
  • Delayed respiratory compensation, characterized by an increasing VE-Vco2 slope and decreasing PETCO2, was more pronounced with longer duty-cycles.

Conclusions:

  • The kinetics of respiratory compensation are influenced by the duration of work intervals during supra-maximal exercise.
  • Findings do not support significant contributions from zero-order central command or peripheral neurogenesis to respiratory compensation.
  • The slow kinetics of respiratory compensation may involve H(+)-signal transduction properties of carotid chemoreceptors.