PMID: 632188Mar 1, 1978Paper

Influence of abdominal gas on the Boyle's law determination of thoracic gas volume

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
R BrownE R McFadden


In a body plethysmograph we have demonstrated differences in total lung capacity (TLC) derived from panting maneuvers performed at different levels in the vital capacity. In almost all cases, the discrepancies were due to the magnitude of the abdominal gas volume (AGV) and the relative magnitude of abdominal and thoracic pressure swings during the panting mandeuver. When panting was performed at functional residual capacity (FRC), the effect of AGV compression on the determination of thoracid gas volume (TGV) was small. Of 11 individuals studied 2 were known to have mild asthma. Compression and decompression of AGV appeared to be an insufficient explanation for discrepancies in derived TLC's in these two, suggesting that other as yet unidentified factors may influence the plethysmographic determination of TGV.


Apr 1, 1995·Annals of Medicine·M LuostarinenJ Isolauri
Oct 1, 1989·The American Review of Respiratory Disease·T K AldrichD J Prezant
Feb 28, 2002·The American Journal of Clinical Nutrition·David A FieldsMegan A McCrory
Apr 16, 1998·Journal of Applied Physiology·R Peslin, C Duvivier
Jul 16, 2005·Experimental Lung Research·Andrew HoffmanEdward Ingenito

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