NDLI: Vectorcardiographic results from skylab medical experiment m092: lower body negative pressure

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Vectorcardiographic results from skylab medical experiment m092: lower body negative pressure

Content Provider	NASA Technical Reports Server (NTRS)
Author	Nicogossian, A. E. Johnson, R. L. Bergman Jr., S. A. Hoffler, G. W. Jackson, M. M.
Copyright Year	1974
Description	Vectorcardiograms were recorded via a modified Frank lead system from all crewmen of the three Skylab missions in conjuction with the Lower Body Negative Pressure - M092 Experiment. Data were analyzed by a specially developed computer program (VECTAN). Design of the test sequences allowed direct comparisons of supine resting, Earth based (reference) vectorcardiograms with those taken during lower body negative pressure stress and those obtained at rest in orbit, as well as combinations of these conditions. Results revealed several statistically significant space flight related changes; namely, increased testing and lower body negative pressure stressed heart rates, modestly increased PR interval and corrected QTC interval, and greatly increased P and QPS loop maximal amplitudes. In addition, orientation changes in the QRS maximum vector and the J-vector at rest in space seem quite consistent among crewmen and different from those caused by the application of lower body negative pressure. No clinical abnormalities were observed. Etiology of these findings is conjectured to be, at least in part, related to fluid mass shifts occurring in weightlessness and attendant alterations in cardiovascular dynamics and myocardial autonomic control mechanisms.
File Size	9781278
Page Count	25
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750006317
Archival Resource Key	ark:/13960/t6m08wb66
Language	English
Publisher Date	1974-11-01
Access Restriction	Open
Subject Keyword	Aerospace Medicine Cardiovascular System Heart Rate Spacecrews Acceleration Stresses Physiology Skylab Program Clinical Medicine Weightlessness Vectorcardiography Computer Programs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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