expiratory reserve volume


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Related to expiratory reserve volume: vital capacity, inspiratory capacity, total lung capacity

expiratory reserve volume

[ek′spī·rə‚tȯr·ē ri¦zərv ‚väl·yəm]
(physiology)
At the end of a normal expiration, the quantity of air that can be expelled by forcible expiration.
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References in periodicals archive ?
The main change seen on PFT is an approximately 20% drop in FRC (that portion of a breath that can still be exhaled after normal resting exhalation), due to a decrease in both expiratory reserve volume (ERV) and residual volume (RV).
Many literature reports emphasize the fact that morbidly obese patients have reduced expiratory reserve volume (ERV) and reduced al functional residual capacity (FRC), as well as restrictive respiratory behavior in many cases.
The mechanism by which changes in respiratory function occur may be due to greater relaxation of respiratory muscles induced by supra spinal mechanisms which increase expiratory reserve volume contributing to a rise in vital capacity.