Dahlbäck G O, Jönsson E, Linér M H
Undersea Biomed Res. 1978 Mar;5(1):71-85.
The effect of water immersion on static lung volumes and pressure-volume curves was studied in five subjects. A special container allowed measurements during nonimmersion, head-out immersion, and thorax immersion leaving the head, pelvis region, and legs dry. It was thus possible to separate the part played by hydrostatic forces acting on the chest from the part played by intrathoracic blood pooling during immersion. Hydrostatic compression of the chest decreased total lung capacity (TLC) by 0.30 liter and residual volume (RV) by 0.25 liter. Blood redistributed into the thorax during head-out immersion caused a further reduction of TLC of 0.13 liter; RV increased by 0.10 liter, probably because expiration was hampered by air-trapping. Heal-out immersion reduced VC by 0.29 liter compared to nonimmersion, and this effect was wholly attributable to intrathoracic blood pooling. Lung compliance during head-out immersion was 0.11 liter x (cmH2O)-1 smaller than during nonimmersion; this was mainly due to intrathoracic blood pooling. Results support the notion that blood redistribution decreased lung compliance by exerting an erectile effect on the lung tissue.
对五名受试者研究了水浸对静态肺容量和压力-容量曲线的影响。一个特殊的容器允许在非浸水、头部露出浸水和胸部浸水（头部、骨盆区域和腿部保持干燥）期间进行测量。因此，有可能将浸水期间作用于胸部的静水压力所起的作用与胸腔内血液淤积所起的作用区分开来。胸部的静水压力压缩使肺总量（TLC）减少0.30升，残气量（RV）减少0.25升。头部露出浸水期间血液重新分布到胸腔导致TLC进一步减少0.13升；RV增加0.10升，可能是因为气体潴留阻碍了呼气。与非浸水相比，头部露出浸水使肺活量（VC）减少0.29升，这种影响完全归因于胸腔内血液淤积。头部露出浸水期间的肺顺应性比非浸水期间小0.11升×（厘米水柱）-1；这主要是由于胸腔内血液淤积。结果支持这样一种观点，即血液重新分布通过对肺组织产生勃起效应而降低了肺顺应性。
