Regional lung strain in dogs during deflation from total lung capacity

J. R. Rodarte, R. D. Hubmayr, D. Stamenovic, B. J. Walters

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Regional lung distortion during deflation from total lung capacity to functional residual capacity (FRC) in intact supine and prone anesthetized dogs was determined from the displacement of multiple metallic markers embedded in the lung parenchyma. Distortion was expressed as strain (ε), which is related to fractional length changes. In the supine position, transverse strain (ε(yy)) was larger than vertical strain (ε(xx)) and cephalocaudal strain (ε(zz)) in the upper lobe. The FRC of the lower lobe was smaller than FRC of the upper lobe and all strains were larger, but ε(zz) increased most and became equal to ε(yy). In the prone position, ε(yy) was largest in all upper lobes and in three of four lower lobes. Strains and volumes of the upper and lower lobes were similar. The upper and lower lobes rotated slightly around different axes, indicating that interpleural fissures allow additional degrees of freedom for the lungs to conform to the thoracic cavity. In the prone position, there were no consistent gradients of strain or volume. These results indicate that, in determining the regional distribution of FRC in the recumbent dog, in addition to the effect of gravity on the lung, there are important interactions between lung and thoracic cavity shapes.

Original languageEnglish (US)
Pages (from-to)164-172
Number of pages9
JournalJournal of Applied Physiology
Volume58
Issue number1
StatePublished - 1985

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Total Lung Capacity
Functional Residual Capacity
Dogs
Lung
Thoracic Cavity
Prone Position
Supine Position
Gravitation

ASJC Scopus subject areas

  • Endocrinology
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Rodarte, J. R., Hubmayr, R. D., Stamenovic, D., & Walters, B. J. (1985). Regional lung strain in dogs during deflation from total lung capacity. Journal of Applied Physiology, 58(1), 164-172.

Regional lung strain in dogs during deflation from total lung capacity. / Rodarte, J. R.; Hubmayr, R. D.; Stamenovic, D.; Walters, B. J.

In: Journal of Applied Physiology, Vol. 58, No. 1, 1985, p. 164-172.

Research output: Contribution to journalArticle

Rodarte, JR, Hubmayr, RD, Stamenovic, D & Walters, BJ 1985, 'Regional lung strain in dogs during deflation from total lung capacity', Journal of Applied Physiology, vol. 58, no. 1, pp. 164-172.
Rodarte JR, Hubmayr RD, Stamenovic D, Walters BJ. Regional lung strain in dogs during deflation from total lung capacity. Journal of Applied Physiology. 1985;58(1):164-172.
Rodarte, J. R. ; Hubmayr, R. D. ; Stamenovic, D. ; Walters, B. J. / Regional lung strain in dogs during deflation from total lung capacity. In: Journal of Applied Physiology. 1985 ; Vol. 58, No. 1. pp. 164-172.
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