Document Detail

Force and power characteristics of a resistive exercise device for use in space.
MedLine Citation:
PMID:  11541605     Owner:  NASA     Status:  MEDLINE    
We have developed a non-gravity dependent mechanical device, which provides resistance during coupled concentric and eccentric muscle actions, through the inertia of a spinning fly-wheel (Fly-Wheel Ergometry; FWE). Our research shows that lower-limb FWE exercise can produce forces and thus muscular stress comparable to what is typical of advanced resistance training using free weights. FWE also offers greater training stimuli during eccentric relative to concentric muscle actions, as evidenced by force and electromyographic (EMG) measurements. Muscle use of specific muscle groups, as assessed by the exercise-induced contrast shift of magnetic resonance images, is similar during lower-limb FWE and the barbell squat. Unlike free-weight exercise, FWE allows for maximal voluntary effort in each repetition of an exercise bout. Likewise, FWE exercise, not unassisted free-weight exercise, produces eccentric "overload". Collectively, the inherent features of this resistive exercise device and the results of the physiological evaluations we have performed, suggest that resistance exercise using FWE could be used as an effective exercise counter-measure in space. The flywheel principle can be employed to any exercise configuration and designed into a compact device allowing for exercises stressing those muscles and bone structures, which are thought to be most affected by long-duration spaceflight.
H E Berg; P A Tesch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta astronautica     Volume:  42     ISSN:  0094-5765     ISO Abbreviation:  Acta Astronaut     Publication Date:    1998 Jan-Apr
Date Detail:
Created Date:  1999-05-10     Completed Date:  1999-05-10     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9890631     Medline TA:  Acta Astronaut     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  219-30     Citation Subset:  S    
Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.
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MeSH Terms
Aerospace Medicine
Bone Density
Equipment Design
Ergometry / instrumentation*
Exercise / physiology
Exercise Therapy / instrumentation*
Muscular Atrophy / etiology,  prevention & control
Space Flight / instrumentation*
Weightlessness / adverse effects*
Weightlessness Countermeasures*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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