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A typical incentive spirometer consists of an inhalation nozzle, which is seen facing toward the camera. The curved plastic on the left is a handle. The piston is in the middle (along with an adjustable mark to indicate a goal), and on the right side is a flow indicator showing whether the patient is inhaling too rapidly.
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Hutchinson published his paper about his water spirometer and the measurements he had taken from more than 4,000 subjects, [2] describing the direct relationship between vital capacity and height and the inverse relationship between vital capacity and age. He also showed that vital capacity does not relate to weight at any given height.
The spirometry test is performed using a device called a spirometer, [2] which comes in several different varieties. Most spirometers display the following graphs, called spirograms: a volume-time curve, showing volume (litres) along the Y-axis and time (seconds) along the X-axis
Output of a spirometer. Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation.It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume.
Here are links to possibly useful sources of information about Spirometry. PubMed provides review articles from the past five years (limit to free review articles) The TRIP database provides clinical publications about evidence-based medicine. Other potential sources include: Centre for Reviews and Dissemination and CDC
A simple whole plant respirometer designed to measure oxygen uptake or CO 2 release consists of a sealed container with the living specimen together with a substance to absorb the carbon dioxide given off during respiration, such as soda lime pellets or cotton wads soaked with potassium hydroxide. The oxygen uptake is detected by manometry. [5]
TLC: Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV. TV: Tidal volume: that volume of air moved into or out of the lungs in 1 breath (TV indicates a subdivision of the lung; when tidal volume is precisely measured, as in gas exchange calculation, the symbol TV or V T is used.)