Breathing video, at a frequency of 15 times per minute, with a tidal volume of 6.5 litres. [wmv file]

Breathing video, at a frequency of 20 times per minute, with a tidal volume of 11 litres. [wmv file]

Breathing video, at a frequency of 24 times per minute, with a tidal volume of 17 litres. [wmv file]

Breathing model, built in Alias Maya, with MEL scripting [rar file]

Modeling the intercostal muscles between the ribs (green lines):



Abdominal cavity, diphragm in green:



Abdominal cavity, longitudinal (green) and transverse (white) muscles (the obliques are not shown here.):



Final torso model:




Slow breathing, 12 times per minute, abdominal breathing only:




Slow breathing, 12 times per minute, combined abdominal and chest breathing:



Fast breathing, 20 times per minute:



Fast breathing, 24 times per minute:



Comparing our tidal volumes (large amplitudes) with other results (small amplitudes) at varying frequencies: