Abstract
The importance of lung elasticity (reciprocal of compliance) on the change in functional residual capacity (F.R.C.) induced by posture was studied. F.R.C. was evaluated in adult rabbits under one year and over three years of age. As in man, the static lung compliance of the older rabbits was higher than in the young. A significant positive linear correlation was found between static lung compliance and the change in the F.R.C resulting from change in posture. The 20 degrees head-up or head-down position in the young rabbits resulted in 6 and 7 per cent increases and decreases in F.R.C., respectively from that of the horizontal prone position. By contrast, the same postural changes resulted in 25 and 21 per cent increases and decreases in F.R.C., respectively, in older rabbits.
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