CHANGE OF VITAL CAPACITY WITH THE ASSUMPTION OF THE SUPINE POSITION

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Abstract
Spirometric measurements of the vital capacity in 10 human subjects indicated 54% of the avg. loss of 341 cc. following recumbency was regained in 10 min. A similarly induced decrease (860 cc.) of the expiratory reserve was unaffected. An increase of vital capacity and a decrease of expiratory reserve as compared to their previous erect values accompanied resumption of the upright position. In 6 subjects, a high correlation was found between the vertical component of the arc through which the body moves in assuming recumbency, expressed as 1-cosine of the angle designating the subjects'' position, and the diminution of vital capacity.

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