Summary There is no significant difference in the dynamic V/P loops of the lung between supine position with the head in normal median position, and prone position, i.e. when there is no deformation of the upper airways. In both prone and supine position with flexion or rotation of the head, the slope of the V/P loops was decreased and the width of the loops in creased. In pulmonary function tests special attention should therefore be given to the position of the head in relation to the body.

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