Nevner bevegelsen i diafragma under en spirometri test (innpust og utpust) og at noen har observert 9cm bevegelighet.

http://www.ncbi.nlm.nih.gov/pubmed/23778774

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-35552013000200128&lng=en&nrm=iso&tlng=en

There were large ranges of variation (in mm) in the obtained minimum and maximum values, and such variations were also reported in other studies^8,6,24. Simon et al.¹³ observed a diaphragmatic value range from 0 to 85 mm, Houston et al.²⁵ observed a range from 23 to 97 mm, Kantarci et al.²⁷ observed a range from 25 to 84 mm and Boussuges et al.⁸ observed a range from 36 to 92 mm.