Journal of Applied Physiology
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J Appl Physiol 92: 709-716, 2002; doi:10.1152/japplphysiol.00644.2001
8750-7587/02 $5.00
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Vol. 92, Issue 2, 709-716, February 2002

Effect of gravity on chest wall mechanics

D. Bettinelli1, C. Kays2, O. Bailliart3, A. Capderou4, P. Techoueyres2, J. L. Lachaud2, P. Vaïda2, and G. Miserocchi1

1 Dipartimento di Medicina Sperimentale, Ambientale e Biotecnologie Mediche, Università di Milano-Bicocca, I-20052 Monza, Italy; 2 Médecine Aerospatiale, Université de Bordeaux, F-33076 Bordeaux; 4 Centre Chirurgical Marie Lannelongue, Unité Propre de Recherche de l'Enseignement Supérieur Equipe Associee 2397, Université Paris XI, F-92350 Le Plessis Robinson; and 3 Hôpital Lariboisière, F-75010 Paris, France

Chest wall mechanics was studied in four subjects on changing gravity in the craniocaudal direction (Gz) during parabolic flights. The thorax appears very compliant at 0 Gz: its recoil changes only from -2 to 2 cmH2O in the volume range of 30-70% vital capacity (VC). Increasing Gz from 0 to 1 and 1.8 Gz progressively shifted the volume-pressure curve of the chest wall to the left and also caused a fivefold exponential decrease in compliance. For lung volume <30% VC, gravity has an inspiratory effect, but this effect is much larger going from 0 to 1 Gz than from 1 to 1.8 Gz. For a volume from 30 to 70% VC, the effect is inspiratory going from 0 to 1 Gz but expiratory from 1 to 1.8 Gz. For a volume greater than ~70% VC, gravity always has an expiratory effect. The data suggest that the chest wall does not behave as a linear system when exposed to changing gravity, as the effect depends on both chest wall volume and magnitude of Gz.

chest wall compliance; chest wall resting volume; esophageal pressure; supine posture


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