| WISE-2005: exercise and nutrition countermeasures for upright VO2pk during bed rest. | |
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MedLine Citation:
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PMID: 19915502 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: Exercise prescriptions for spaceflight include aerobic and resistive countermeasures, yet few studies have evaluated their combined effects on exercise responses after real or simulated microgravity. We hypothesized that upright aerobic capacity (VO2pk) is protected during a 60-d bed rest (BR) in which intermittent (40%-80% pre-BR VO2pk) aerobic exercise (supine treadmill exercise against lower body negative pressure) was performed 2-4 d x wk(-1) and resistive exercise (inertial flywheel exercises) was performed 2-3 d x wk(-1). Further, we hypothesized that ingestion of an amino acid supplement that was shown previously to counteract muscle atrophy, would reduce the decline in VO2pk in nonexercising subjects during BR. METHODS: Twenty-four healthy women (8 nonexercise controls (CON), 8 exercisers (EX), and 8 nonexercisers with nutritional supplementation (NUT)) underwent a 20-d ambulatory baseline period, 60 d of 6 degrees head-down tilt BR, and 21 d of ambulatory recovery. VO2pk was measured pre-BR and on the third day of recovery from BR (R3). RESULTS: In the EX group, VO2pk (mean +/- SE) was not different from pre-BR (-3.3 +/- 1.2%) on R3, although it decreased significantly in the CON (-21.2 +/- 2.1%) and NUT (-25.6 +/- 1.6%) groups. CONCLUSIONS: These results indicate that alternating aerobic and resistive exercise on most days during prolonged microgravity simulated by BR is sufficient to preserve or allow quick recovery of upright aerobic capacity in women but that a nutritional supplementation alone is not effective. |
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Authors:
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Suzanne M Schneider; Stuart M C Lee; Brandon R Macias; Donald E Watenpaugh; Alan R Hargens |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 41 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-11-20 Completed Date: 2010-02-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 2165-76 Citation Subset: IM; S |
Affiliation:
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Department of Health, Exercise and Sports Sciences, University of New Mexico, Albuquerque, NM 87131-0001, USA. sschneid@unm.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bed Rest / adverse effects* California Dietary Supplements* Exercise / physiology* Exercise Test Female France Humans Nutritional Requirements Oxygen Consumption / physiology* Treatment Outcome Weightlessness Countermeasures* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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