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. 2016 Dec 30;4(24):e13068. doi: 10.14814/phy2.13068

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Published 2016. This article is a U.S. Government work and is in the public domain in the USA. Physiological Reports published by Wiley Periodicals, Inc. on behalf of The Physiological Society and the American Physiological Society

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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(Panel A) Mean (±standard deviation) internal jugular venous pressure (IJVP) was significantly lower (P ≤ 0.001) when supine before flight (Earth gravity, 1G) than during parabolic flight‐induced periods of weightlessness (0G). Individual results (n = 11) are displayed as gray lines. (Panel B) IJVP appeared to increase as gravitational load decreased from 1 g to 0G in two subjects during parabolic flight. Data from individual subjects are represented as mean ± standard deviation of 3–5 IJVP measurements.