respiratory dead space


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respiratory dead space

[′res·prə‚tȯr·ē ′ded ‚spās]
(physiology)
That part of the respiratory system which has no alveoli and in which little or no exchange of gas between air and blood takes place.
References in periodicals archive ?
* The purpose of the study was to investigate the effects of implementing additional respiratory dead space during cycloergometry-based aerobic training on respiratory exchange ratio and carbon dioxide production.
First, an obvious difference between mask wear and non-wear is respiratory dead space. It has been shown, in horses (7,14,18) and humans, (26) that increased dead space during exercise results in increased [V.sub.T] but not necessarily reduced [f.sub.R], (3) resulting in variable effects on alveolar ventilation.
Alveolar ventilation was used because the pulmonary minute ventilation includes mixed exhaled breath that contains both alveolar (end-tidal) gas and inhaled gas from the respiratory dead space where there is no gas exchange.