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Related Concept Videos

Cardiopulmonary Resuscitation II: ACLS Airway Management01:22

Cardiopulmonary Resuscitation II: ACLS Airway Management

Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned under...
Sleep Apnea01:21

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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...
Alterations in Respiration II01:30

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There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
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Related Experiment Video

Updated: Jun 19, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Apnea: a new training method in sport?

Frédéric Lemaître1, Fabrice Joulia, Didier Chollet

  • 1Faculté des Sciences du Sport et de l'Education Physique de Rouen, Centre d'Etudes des Transformations des Activités Physiques et Sportives, Equipe d'Accueil UPRES N degrees 3832, Université de Rouen, France. frederic.lemaitre@univ-rouen.fr

Medical Hypotheses
|October 24, 2009
PubMed
Summary

Apnea training in elite divers improves sports performance through physiological adaptations like reduced acidosis and increased red blood cells. This method may enhance aerobic and anaerobic capacity, offering an alternative to hypoxia training.

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Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
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Last Updated: Jun 19, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

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Published on: December 22, 2016

Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
08:34

Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns

Published on: September 16, 2019

Area of Science:

  • Physiology
  • Sports Science
  • Environmental Medicine

Background:

  • Elite breath-hold divers display unique physiological adaptations.
  • These adaptations may enhance athletic performance.

Purpose of the Study:

  • To investigate the physiological responses to apnea training in elite divers.
  • To determine if these adaptations can improve sports performance.

Main Methods:

  • Observational study of elite breath-hold divers.
  • Analysis of physiological markers including blood acidosis, oxidative stress, hematocrit, erythropoietin, hemoglobin mass, and lung volumes.

Main Results:

  • Divers exhibit reduced blood acidosis and oxidative stress.
  • Increased hematocrit, erythropoietin concentration, hemoglobin mass, and lung volumes were observed.
  • Lowered basal metabolic rate was noted.

Conclusions:

  • Physiological adaptations in divers support longer apnea durations and improved performance.
  • Apnea training shows potential as an alternative to hypoxic training for enhancing athletic capacity.