The effect of two passive head-down tilt positions on diaphragm excursion in healthy adults: A preliminary study.

Background And Purpose: A head-down tilt position could influence diaphragm excursion due to abdominal content displacement. The purpose of the study was to determine if excursion could be influenced by a head-down tilt position and if this change in excursion alters the diaphragm function.

Design: Prospective quasi-experimental study.