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Measurement setup. A face mask covering the nose was sealed with an adhesive elastomer and held in place by head straps. The mask was connected directly to a pneumotachograph, which was connected to a Y-piece containing inspiratory and expiratory valves. The inspiratory port was connected to a pneumatic valve (Hans Rudolph) that could occlude this port while allowing expiration to continue such that airway occlusion could be performed at functional residual capacity.
