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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Alterations in Respiration II01:30

Alterations in Respiration II

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.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
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...
Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue, improving...
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...
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...

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Live and/or sleep high:train low, using normobaric hypoxia.

J-P Richalet1, C J Gore

  • 1Université Paris 13, Laboratoire Réponses Cellulaires et Fonctionnelles à l'Hypoxie, EA2363, ARPE, Bobigny, France. richalet@smbh.univ-paris13.fr

Scandinavian Journal of Medicine & Science in Sports
|September 9, 2008
PubMed
Summary

Living high and training low (LHTL) using simulated altitude can enhance aerobic performance. Optimal exposure duration is over 18 days, with good tolerance below 3000m, but anaerobic performance effects remain unknown.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Altitude Training

Background:

  • High-altitude exposure increases oxygen transport, aiming to boost sea-level physical performance.
  • Training at high altitude does not consistently improve sea-level aerobic performance.
  • The 'living high, training low' (LHTL) strategy emerged to optimize altitude training benefits.

Purpose of the Study:

  • To review studies on LHTL, including simulated altitude (hypobaric/normobaric hypoxia).
  • To assess hematological, aerobic, and submaximal performance changes.
  • To evaluate tolerance and identify research gaps, particularly concerning anaerobic performance.

Main Methods:

  • Review of key studies employing LHTL with simulated altitude.
  • Analysis of hematological markers (red cell mass).
  • Assessment of maximal and submaximal aerobic performance, running economy, and tolerance parameters.

Main Results:

  • Hematological changes (red cell mass) were moderate and dose-dependent.
  • Maximal aerobic performance improved with hypoxia exposure over 18 days.
  • Submaximal performance and running economy showed mixed but often positive results; tolerance was good below 3000m.

Conclusions:

  • LHTL, especially with simulated altitude, can enhance maximal aerobic performance and potentially running economy.
  • The optimal duration for hypoxia exposure appears to be over 18 days.
  • Further research is needed on anaerobic performance and the widespread application of LHTL techniques.