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Related Concept Videos

Hypoxia01:23

Hypoxia

1.5K
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...
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Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

4.9K
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,...
4.9K
Physiological Control of Respiration01:23

Physiological Control of Respiration

5.1K
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...
5.1K
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

1.8K
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...
1.8K
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

785
Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
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Related Experiment Video

Updated: Nov 20, 2025

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

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Hypoxia and standing balance.

Mathew I B Debenham1, Janelle N Smuin1, Tess D A Grantham1

  • 1School of Health and Exercise Sciences, Faculty of Health and Social Development, University of British Columbia Okanagan, Kelowna, Canada.

European Journal of Applied Physiology
|January 23, 2021
PubMed
Summary
This summary is machine-generated.

Hypoxia, particularly at high altitudes, significantly impairs standing balance. This affects sensorimotor integration, impacting visual, vestibular, and proprioceptive systems crucial for everyday stability.

Keywords:
AltitudeHypobaric hypoxiaNormobaric hypoxiaPostural balancePostureStanding

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Area of Science:

  • Physiology
  • Neuroscience
  • Altitude Medicine

Background:

  • Standing balance is vital for daily activities and is often overlooked until deficits arise.
  • Over 200 million individuals reside at altitudes exceeding 2500m, with many others traveling or working at such elevations.
  • Understanding hypoxia's impact on balance is crucial for travelers and those in high-altitude occupations.

Purpose of the Study:

  • To review and summarize the effects of normobaric and hypobaric hypoxia on standing balance control.
  • To examine hypoxic-sensitive neurophysiological factors contributing to balance impairments.
  • To investigate how hypoxia affects visual, vestibular, and proprioceptive cues and their neural integration.

Main Methods:

  • A systematic review of scientific literature was conducted.
  • Databases were searched using keywords related to postural balance, hypoxia, and altitude.
  • Thirteen articles meeting specific inclusion criteria were analyzed.

Main Results:

  • Normobaric hypoxia worsened standing balance parameters by 2-10%.
  • Hypobaric hypoxia caused more significant impairments, ranging from 83% to 240%.
  • Balance disruption occurred during normobaric hypoxia at FiO2 < ~0.15 and consistently during hypobaric hypoxia at altitudes > 1524m.

Conclusions:

  • Hypoxia, especially hypobaric, demonstrably impairs standing balance.
  • Mechanisms involve altered processing and integration of sensorimotor signals in the brain.
  • Further research is needed to identify specific sensorimotor factors influencing balance in hypoxic conditions.