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Related Concept Videos

Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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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Related Experiment Video

Updated: Jul 4, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Pulmonary function parameters changes at different altitudes in healthy athletes.

Vahid Ziaee1, Reza Alizadeh, Ali Movafegh

  • 1Department of Pediatrics, Sports Medicine Research Center, Medical Sciences/University of Tehran, Tehran, Iran. Ziaee@tums.ac.ir

Iranian Journal of Allergy, Asthma, and Immunology
|June 17, 2008
PubMed
Summary
This summary is machine-generated.

High-altitude trekking significantly impacts lung function, decreasing forced vital capacity (FVC) and altering peak flow. These pulmonary changes are altitude-dependent.

Related Experiment Videos

Last Updated: Jul 4, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Area of Science:

  • Physiology
  • Altitude Medicine
  • Respiratory Science

Background:

  • Hypoxia and hypocapnia at high altitudes can induce bronchoconstriction, potentially affecting physical performance.
  • Understanding pulmonary responses during high-altitude trekking is crucial for assessing physiological adaptation.

Purpose of the Study:

  • To investigate changes in pulmonary ventilatory functions during high-altitude trekking.
  • To examine the relationship between altitude and spirometric parameters in healthy volunteers.

Main Methods:

  • A cohort study involving 56 healthy male university students.
  • Spirometry (Spirolab II) was performed at baseline (1150m), various altitudes (2850m, 4150m), and sea level during a 3-day trek.

Main Results:

  • Forced vital capacity (FVC) significantly decreased with increasing altitude and remained lower than baseline post-trek.
  • Peak flow initially increased with altitude up to 2850m, then decreased.
  • Maximal midexpiratory flow rate (FEF 25-75%) and FEV1/FVC ratio increased with altitude changes, while FEV1 remained unchanged.

Conclusions:

  • Pulmonary ventilatory parameter changes during high-altitude trekking are proportional to altitude variations.
  • Significant alterations in lung function occur early during ascent, highlighting the body's adaptation to altitude stress.