PMID: 3773672Oct 1, 1986Paper

Aerobic fitness does not contribute to prediction of orthostatic intolerance

Medicine and Science in Sports and Exercise
V A ConvertinoW R Alford

Abstract

Several investigations have suggested that orthostatic tolerance may be inversely related to aerobic fitness (VO2max). To test this hypothesis, 18 males (age 29 to 51 yr) underwent both treadmill VO2max determination and graded lower body negative pressures (LBNP) exposure to tolerance. VO2max was measured during the last minute of a Bruce treadmill protocol. LBNP was terminated based on pre-syncopal symptoms, and LBNP tolerance (peak LBNP) was expressed as the cumulative product of LBNP and time (torr-min). Changes in heart rate, stroke volume, cardiac output, blood pressure, and impedance rheographic indices of mid-thigh-leg fluid accumulation were measured at rest and during the final minute of LBNP. For all 18 subjects, mean (+/- SE) fluid accumulation index and leg venous compliance index at peak LBNP were 139 +/- 22 ml and 3.9 +/- 0.4 ml . 100 ml . torr-min-2 x 10(3), respectively. Pearson product-moment correlations and step-wise linear regression were used to investigate relationships with peak LBNP. Variables associated with endurance training, such as VO2max and percent body fat, were not found to correlate significantly (P less than 0.05) with peak LBNP and did not add sufficiently to the prediction of peak LBNP to b...Continue Reading

Citations

Jan 1, 1993·European Journal of Applied Physiology and Occupational Physiology·V A ConvertinoG W Hoffler
Feb 1, 1995·Acta Astronautica·V A Convertino, H Sandler
Aug 7, 2009·Experimental Biology and Medicine·Harold G KlemckeVictor A Convertino
Sep 4, 2010·The Journal of Pediatrics·Barbara E U BurkhardtPaolo T Pianosi
Aug 4, 2011·The Journal of Trauma·Victor A ConvertinoKathy L Ryan

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