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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...
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...
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 Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
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...
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...

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Related Experiment Video

Updated: Jun 16, 2026

Phase-Resolved Functional Lung MRI for Pulmonary Ventilation and Perfusion (V/Q) Assessment
05:56

Phase-Resolved Functional Lung MRI for Pulmonary Ventilation and Perfusion (V/Q) Assessment

Published on: August 9, 2024

Time for new reference values for ventilatory lung function.

W Marek1, E Marek, K Mückenhoff

  • 1Institute for Occupational Physiology, Augusta-Kranken-Anstalt, Bochum, Germany. Wolfgang.Marek@ruhr-uni-bochum.de

European Journal of Medical Research
|February 17, 2010
PubMed
Summary
This summary is machine-generated.

Lung function reference values from the European Community (ECCS) may be outdated for today's aging population. New lung function data shows a steeper age-related decline than ECCS values suggest.

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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship

Published on: January 8, 2019

Area of Science:

  • Pulmonary physiology
  • Geriatric medicine
  • Respiratory health

Background:

  • Anthropometric data in aging populations have changed significantly over the past 50 years.
  • Current European Community for Steel and Coal (ECCS) reference values for lung function may not accurately reflect these changes.
  • Extrapolation of reference equations is used to classify lung function in older individuals.

Purpose of the Study:

  • To evaluate the validity of current European Community for Steel and Coal (ECCS) reference values for lung function in an aging population.
  • To compare measured lung function in healthy males aged 20-90 years with established reference values.
  • To determine if updated reference values are needed for accurate lung function assessment.

Main Methods:

  • Pneumotachography was used to measure static lung volumes and flow-volume curves in 257 asymptomatic, non-smoking males.
  • Participants ranged in age from 20 to 90 years.
  • Results were compared against ECCS, SAPALDIA, LuftiBus, and NHANES reference values.

Main Results:

  • Lung function parameters (VC, FVC, FEV(1), etc.) showed a linear dependence on height and age.
  • The forced expiratory volume in one second (FEV(1)) was modeled using the equation: FEV(1) = 0.0432 * Height - 0.0347 * Age - 2.114.
  • Mean FEV(1) was 106.1% of ECCS values in younger subjects and 97.8% in older subjects.
  • Age-related decline in lung function was steeper than predicted by ECCS values, while height dependence aligned with ECCS prescriptions.

Conclusions:

  • Lung function values in healthy subjects from Bochum exhibit a steeper age-related decline than ECCS reference values.
  • Alternative reference values (SAPALDIA, NHANES, LuftiBus) are higher but may lack comprehensive parameters or age range coverage.
  • A multi-center study is recommended to establish contemporary reference values for lung function.