Hillebrecht, A. (1) und Schulz, H. (1) und Meyer, M. (1) und Baisch, F. und Beck, L. und Blomqvist, C. G (2) (1992) Pulmonary Responses to Lower Body Negative Pressure and Fluid Loading During Head-Down Tilt Bedrest. Acta Physiologica Astronautica, S604, Seiten 35-42. Blackwell Scientific Publications, Oxford, England.
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Kurzfassung
Exposure to microgravity redistributes body fluids with important secondary effects on cardiovascular function. We tested the hypothesis that the fluid shifts also affect pulmonary gas exchange. Microgravity was simulated in six male volunteers by a 10-day period of bedrest at 6 degrees head-down tilt (HDT). Lower body negative pressure (LBNP) and intravenous saline loading superimposed acute changes in fluid distribution on the prolonged effects of HDT. HDT produced relative dehydration and hypovolemia with decreased pulmonary blood flow and diffusing capacity. Before bedrest, pulmonary blood flow decreased by 24% during LBNP and diffusing capacity by 7%, while functional residual capacity increased by 14% (p<0.05). Intravenous saline loading caused a 24% increase in pulmonary blood-flow (p<0.05). Functional residual capacity decreasedby 10% and diffusing capacity by 6% (p<0.05). Lung tissue volume did not change significantly. Head-down tilt had only minor effects on the responses to LBNP and saline loading. We conclude that LBNP and intravenous saline loading produce major changes in pulmonary blood flow and minor effects on pulmonary gas exchange, and that the response to acute changes in fluid distribution is not significantly altered during simulated microgravity.
elib-URL des Eintrags: | https://elib.dlr.de/26764/ | ||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||
Zusätzliche Informationen: | LIDO-Berichtsjahr=1993, pages=8, | ||||||||||||||||||||||||||||
Titel: | Pulmonary Responses to Lower Body Negative Pressure and Fluid Loading During Head-Down Tilt Bedrest | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | 1992 | ||||||||||||||||||||||||||||
Erschienen in: | Acta Physiologica Astronautica | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||
Band: | S604 | ||||||||||||||||||||||||||||
Seitenbereich: | Seiten 35-42 | ||||||||||||||||||||||||||||
Verlag: | Blackwell Scientific Publications, Oxford, England | ||||||||||||||||||||||||||||
Name der Reihe: | 144 | ||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||
Stichwörter: | inert gas rebreathing, intravenous saline loading, microgravity, pulmonary gas exchange | ||||||||||||||||||||||||||||
HGF - Forschungsbereich: | NICHT SPEZIFIZIERT | ||||||||||||||||||||||||||||
HGF - Programm: | keine Zuordnung | ||||||||||||||||||||||||||||
HGF - Programmthema: | keine Zuordnung | ||||||||||||||||||||||||||||
DLR - Schwerpunkt: | NICHT SPEZIFIZIERT | ||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | keine Zuordnung | ||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | NICHT SPEZIFIZIERT | ||||||||||||||||||||||||||||
Standort: | Köln-Porz | ||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Luft- und Raumfahrtmedizin | ||||||||||||||||||||||||||||
Hinterlegt von: | DLR-Beauftragter, elib | ||||||||||||||||||||||||||||
Hinterlegt am: | 02 Apr 2006 | ||||||||||||||||||||||||||||
Letzte Änderung: | 27 Apr 2009 06:20 |
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