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- W1592733488 abstract "We assessed the effects of sustained weightlessness on chest wall mechanics in five astronauts who were studied before, during, and after the 10-day Spacelab D-2 mission ( n = 3) and the 180-day Euromir-95 mission ( n= 2). We measured flow and pressure at the mouth and rib cage and abdominal volumes during resting breathing and during a relaxation maneuver from midinspiratory capacity to functional residual capacity. Microgravity produced marked and consistent changes (Δ) in the contribution of the abdomen to tidal volume [ΔVab/(ΔVab + ΔVrc), where Vab is abdominal volume and Vrc is rib cage volume], which increased from 30.7 ± 3.5 (SE)% at 1 G head-to-foot acceleration to 58.3 ± 5.7% at 0 G head-to-foot acceleration ( P < 0.005). Values of ΔVab/(ΔVab + ΔVrc) did not change significantly during the 180 days of the Euromir mission, but in the two subjects ΔVab/(ΔVab + ΔVrc) was greater on postflight day 1 than on subsequent postflight days or preflight. In the two subjects who produced satisfactory relaxation maneuvers, the slope of the Konno-Mead plot decreased in microgravity; this decrease was entirely accounted for by an increase in abdominal compliance because rib cage compliance did not change. These alterations are similar to those previously reported during short periods of weightlessness inside aircrafts flying parabolic trajectories. They are also qualitatively similar to those observed on going from upright to supine posture; however, in contrast to microgravity, such postural change reduces rib cage compliance." @default.
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- W1592733488 date "1998-06-01" @default.
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- W1592733488 title "Chest wall mechanics in sustained microgravity" @default.
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- W1592733488 doi "https://doi.org/10.1152/jappl.1998.84.6.2060" @default.
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