| Net energy expenditure of gravity-independent high-speed resistive exercise done by women. | |
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MedLine Citation:
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PMID: 22303589 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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INTRODUCTION: Elevated metabolism is common to spaceflight while exercise in microgravity exacerbates energy costs. Thus in-flight exercise countermeasures must be devised that minimize energy costs as they are performed on hardware operable in microgravity. METHODS: Female subjects (N = 28), subdivided into athletic and sedentary groups, each performed two workouts on a resistive exercise device (Impulse Training Systems; Newnan, GA). Comprised exclusively of either tonic or phasic repetitions, each exercise bout entailed two 1 -min sets interspersed by a 90-s rest from which the work volume was determined. Oxygen consumption was measured before, during, and after workouts until gas uptake returned to pre-exercise levels. Net oxygen consumption was converted to net energy expenditures via indirect calorimetry. Mean net energy expenditure and work volume values were each compared with 2 (athletes, sedentaries) x 2 (tonic, phasic) ANOVAs, with repeated measures for workout. In addition, multivariate regression employed three predictor (body mass, body fat percentage, work volume) variables to account for the net energy expenditure variance. RESULTS: Workouts yielded a metabolic cost of approximately 14 kcal, yet the data produced no significant intergroup or workout differences. However, work volume analysis yielded a significant (tonic > phasic) effect. The multivariate analysis explained small yet significant amounts of net energy expenditure variance. DISCUSSION: Current results: 1) are partly attributable to higher series elastic element activity seen with Impulse repetitions; and 2) offer new information with respect to in-flight exercise protocols for female astronauts. |
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Authors:
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John F Caruso; Jake A Borgsmiller; Rebekah D Riner; Melissa L Mason; Brant R Lutz; Colbert C Nelson |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Aviation, space, and environmental medicine Volume: 83 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-02-06 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7501714 Medline TA: Aviat Space Environ Med Country: United States |
Other Details:
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Languages: eng Pagination: 111-7 Citation Subset: IM; S |
Affiliation:
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Exercise and Sport Science Program, The University of Tulsa, OK 74104, USA. john-caruso@utulsa.edu |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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