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Ventilation-perfusion distribution in young and old volunteers during mild exercise

par Derks, Christian
Référence Clinical Respiratory Physiology, 16, 2, page (145-154)
Publication Publié, 1980

Article révisé par les pairs

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Résumé :

Ventilation-perfusion ratios (V̇/Q̇) distributions in young and old volunteers were measured by means of the inert gases method, at rest and at different levels of mild exercise. The V̇/Q̇ distribution of the young group at rest was quite homogeneous and demonstrated log normal V̇/Q̇ distribution curves which were narrow and well situated on the log V̇/Q̇ scale, whereas the older group was heterogeneous and demonstrated broader V̇/Q̇, curves. In both, gas exchange data were in the normal limits. During mild exercise, the ventilation and perfusion curves shifted to higher V̇/Q̇ and those which were broad at rest became narrower. PaO2 increased and (A-a)DO2 decreased.