to understand how bical mechanical chest wall ( cw ) properties are related to those of the cw as a whole , we measured esophageal and gastric pressures , cw volume changes ( measured with a head-out body plethysmograph ) , and anteroposterior and transverse cw diameter changes ( measured with magnetometers attached to the surface ) during sinusoidal forcing at the mouth ( 2.5 % vital capacity , 0.5-10 hz ) in four healthy subjects .
C0018670
head
C0226896
mouth