Document Detail


Net energy expenditure of gravity-independent high-speed resistive exercise done by women.
MedLine Citation:
PMID:  22303589     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
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.
Authors:
John F Caruso; Jake A Borgsmiller; Rebekah D Riner; Melissa L Mason; Brant R Lutz; Colbert C Nelson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  83     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-02-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  111-7     Citation Subset:  IM; S    
Affiliation:
Exercise and Sport Science Program, The University of Tulsa, OK 74104, USA. john-caruso@utulsa.edu
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