Fluid volume redistribution and thoracic volume changes during recumbency

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Abstract
Continuous measurements of change in center of gravity, thoracic and abdominal girths and extremity volume over a 30-minute period of recumbency were recorded in 20 normal young adults. Vital capacity, expiratory reserve volume and residual volumes were recorded at the beginning and end of the period. No significant differences between the initial and final vital capacities or residual volumes were observed. Expiratory reserve volume decreased and correlated positively with the measured change in torque. Abdominal and thoracic end expiratory circumferences both increased. Four young adults, normal except for congenital or traumatic absence of the lower extremities, were examined in the same manner. In these subjects the change in center of gravity was minimal and the thoracic circumference did not increase. The pattern of lung volume changes during recumbency was similar to normal subjects. It is concluded that during recumbency the lower extremities contribute blood to the thoracic pool and this is manifested as an increase in thoracic girth, but without decrease in total lung volume. The diaphragm assumes a more expiratory position and is partially responsible for the change in expiratory reserve volume. Submitted on August 4, 1958

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