Method for the study of passive and active deformation properties of canine diaphragm

C. J. Chuong, J. L. Pean, R. L. Johnson

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


To measure the regional deformation of the diaphragm in-vivo we affixed radiopaque screw markers to the diaphragm and recorded their motion by biplane cinefluorography at 60 frame/sec. The reconstructed three-dimensional coordinates of screw markers were used to characterize the regional deformation of the diaphragm. For a triangular region established by three neighboring markers, under the assumption of homogeneous deformation, the magnitudes and directions of the in-plane principal strain were identified. Experimentally, we applied Muller maneuvers on canines at different controlled resting lung volumes. Regional principal strains were obtained for costal and crural muscles during both passive lung volume change and forced inspiration against a closed airway. The results showed that costal and crural muscles differ in both passive and active deformation properties. Differences in the following parameters were noted: peak principal shortening, peak principal elongation, time derivative of shortening, and the corresponding area changes.

Original languageEnglish (US)
Number of pages12
StatePublished - 1988
EventComputational Methods in Bioengineering - Chicago, IL, USA
Duration: Nov 27 1988Dec 2 1988


OtherComputational Methods in Bioengineering
CityChicago, IL, USA

ASJC Scopus subject areas

  • Engineering(all)


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