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Related Concept Videos

Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
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...
Respiratory Volumes01:15

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...

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Compartmental chest wall volume changes during volitional normocapnic hyperpnoea.

Sabine K Illi1, Stefanie Hostettler, Evelyn Mohler

  • 1Exercise Physiology, Institute of Human Movement Sciences, ETH Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland. sabine.illi@physiol.biol.ethz.ch

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During fatiguing respiratory tasks, the contribution of chest wall compartments to breathing volume does not change. This indicates that inspiratory rib cage muscles do not compensate for diaphragm fatigue by altering their relative workload.

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Area of Science:

  • Physiology
  • Respiratory Mechanics

Background:

  • Diaphragmatic fatigue during increased ventilation may lead to recruitment of inspiratory rib cage muscles.
  • The compensatory role of accessory respiratory muscles is not fully understood.

Purpose of the Study:

  • To investigate if changes in muscle recruitment occur during fatiguing respiratory work.
  • To determine if the relative contribution of chest wall compartments to tidal volume changes with diaphragm fatigue.

Main Methods:

  • Optoelectronic plethysmography was used to assess chest wall volumes.
  • Thirteen healthy subjects underwent 1 hour of fatiguing normocapnic hyperpnea.
  • Breathing frequency, tidal volume, and compartmental contributions were measured.

Main Results:

  • Breathing frequency increased and tidal volume decreased during the fatiguing task.
  • The relative contributions of the pulmonary rib cage, abdominal rib cage, and abdomen to tidal volume remained unchanged.
  • No significant alterations in chest wall compartment contributions were observed.

Conclusions:

  • Fatiguing respiratory work does not alter the relative contribution of chest wall compartments to tidal volume.
  • The findings suggest that inspiratory rib cage muscles do not significantly change their relative contribution to compensate for diaphragm fatigue.
  • Breathing pattern changes during hyperpnea are not associated with altered compartmental mechanics.