1960
DOI: 10.1152/jappl.1960.15.6.1087
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Abdominal and thoracic pressures at different lung volumes

Abstract: The abdominal (gastric) pressures as well as the intrathoracic pressures were recorded in man during various respiratory maneuvers such as complete relaxation, moderate inspiratory and expiratory efforts, maximal inspiratory and expiratory efforts, and during maximal abdominal pressure efforts. Each maneuver was systematically carried out at various lung volumes. From these measurements it is possible to determine the transdiaphragmatic pressure difference and thus obtain information concerning the activity of… Show more

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Cited by 255 publications
(98 citation statements)
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“…(Had we set E thor 2% below optimum, the responses would have been the same, but negative.) At 100m the predicted difference was 14kPa, about the maximum transdiaphragmatic pressure exertable in humans (Agostoni and Rahn, 1960;Laporta and Grassino, 1985), which would wipe out the transmural pressure in an extrathoracic artery. The discrepancy between the predicted air volume and the target volume required for P thor =P amb decreased with depth and was only 1.6l at 100m depth (Fig.14B).…”
Section: Model Predictions Of Thoracic Pressurementioning
confidence: 90%
“…(Had we set E thor 2% below optimum, the responses would have been the same, but negative.) At 100m the predicted difference was 14kPa, about the maximum transdiaphragmatic pressure exertable in humans (Agostoni and Rahn, 1960;Laporta and Grassino, 1985), which would wipe out the transmural pressure in an extrathoracic artery. The discrepancy between the predicted air volume and the target volume required for P thor =P amb decreased with depth and was only 1.6l at 100m depth (Fig.14B).…”
Section: Model Predictions Of Thoracic Pressurementioning
confidence: 90%
“…Co-operative subjects are able to fully activate most limb muscles [1][2][3], but with regards to the diaphragm this issue has been controversial. A commonly accepted idea is that the diaphragm does not produce its maximal force during inspiratory manoeuvres, but rather during expulsive tasks when there is co-contraction of abdominal muscles [4,5]. Although conflicting results have been published [6], several studies applying the twitch occlusion technique to the diaphragm suggest that normal subjects can voluntarily produce maximal diaphragmatic contraction using inspiratory as well as expulsive efforts [7,8].…”
mentioning
confidence: 99%
“…Clinical and laboratory features of 16 spirometer and expressed as percentage of predicted. Functional residual capacity (FRC) and total lung capacity were measured in a volume displacement, pressure-compensated body plethysmograph (13).…”
Section: Methodsmentioning
confidence: 99%