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J Appl Physiol 16: 27-29, 1961;
8750-7587/61 $5.00
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Effect of body posture on lung volumes

Francisco Moreno 1 and Harold A. Lyons 1

1 Department of Medicine, State University of New York, Downstate Medical Center, Brooklyn, New York

The changes produced by body posture on total lung capacity and its subdivisions have been reported for all positions except the prone position. Twenty normal subjects, twelve males and eight females, had determinations of total lung capacity in the three body positions, sitting, supine and prone. Tidal volume, minute ventilation and O2 consumption were also measured. The changes found on assumption of the supine position from the sitting position were similar to those previously reported. For the prone position, a smaller inspiratory capacity and a larger expiratory reserve volume were found. The mean values were changed, respectively, –8% and +37%. Associated with these changes was a significant increase of the functional residual capacity by 636 ml. Ventilation did not change significantly from that found during sitting, unlike the findings associated with the supine position, in which position the tidal volume was decreased. Respiratory frequency remained the same for all positions.

Submitted on April 5, 1960




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