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. 2015 Nov 25;3(11):e12640. doi: 10.14814/phy2.12640

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© 2015 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The 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): Correlation between time to presyncope for two trials of a ramp lower body negative pressure (LBNP) protocol (3 mmHg/min); solid line represents line of identity. Panel (B): Mean time to presyncope for Trial 1 (1649 ± 98 sec; black bar) and Trial 2 (1690 ± 88 sec; white bar) (P = 0.47).