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Open Access 01-05-2009 | Original Article

WISE-2005: effect of aerobic and resistive exercises on orthostatic tolerance during 60 days bed rest in women

Authors: Patrick Guinet, Suzanne M. Schneider, Brandon R. Macias, Donald E. Watenpaugh, Richard L. Hughson, Anne Pavy Le Traon, Jean-Yves Bansard, Alan R. Hargens

Published in: European Journal of Applied Physiology | Issue 2/2009

Abstract

Cardiovascular deconditioning after long duration spaceflight is especially challenging in women who have a lower orthostatic tolerance (OT) compared with men. We hypothesized that an exercise prescription, combining supine aerobic treadmill exercise in a lower body negative pressure (LBNP) chamber followed by 10 min of resting LBNP, three to four times a week, and flywheel resistive training every third day would maintain orthostatic tolerance (OT) in women during a 60-day head-down-tilt bed rest (HDBR). Sixteen women were assigned to two groups (exercise, control). Pre and post HDBR OT was assessed with a tilt/LBNP test until presyncope. OT time (mean ± SE) decreased from 17.5 ± 1.0 min to 9.1 ± 1.5 min (−50 ± 6%) in control group (P < 0.001) and from 19.3 ± 1.3 min to 13.0 ± 1.9 min (−35 ± 7%) in exercise group (P < 0.001), with no significant difference in OT time between the two groups after HDBR (P = 0.13). Nevertheless, compared with controls post HDBR, exercisers had a lower heart rate during supine rest (mean ± SE, 71 ± 3 vs. 85 ± 4, P < 0.01), a slower increase in heart rate and a slower decrease in stroke volume over the course of tilt/LBNP test (P < 0.05). Blood volume (mean ± SE) decreased in controls (−9 ± 2%, P < 0.01) but was maintained in exercisers (−4 ± 3%, P = 0.17).

Our results suggest that the combined exercise countermeasure did not significantly improve OT but protected blood volume and cardiovascular response to sub tolerance levels of orthostatic stress.

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Title: WISE-2005: effect of aerobic and resistive exercises on orthostatic tolerance during 60 days bed rest in women
Authors: Patrick Guinet
Suzanne M. Schneider
Brandon R. Macias
Donald E. Watenpaugh
Richard L. Hughson
Anne Pavy Le Traon
Jean-Yves Bansard
Alan R. Hargens
Publication date: 01-05-2009
Publisher: Springer-Verlag
Published in: European Journal of Applied Physiology / Issue 2/2009
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-009-1009-6

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WISE-2005: effect of aerobic and resistive exercises on orthostatic tolerance during 60 days bed rest in women

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