| Gravity replacement during running in simulated microgravity. | |
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MedLine Citation:
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PMID: 17086763 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: During treadmill exercise on the International Space Station (ISS), a restoring load from a subject load device (SLD) is applied through a shoulder-and-waist harness to pull the exercising crewmember toward the treadmill surface. The capacity of this arrangement to provide 1-g-like reaction forces may be critical for effective use of the treadmill as a countermeasure to musculoskeletal changes during prolonged spaceflight. This study in simulated microgravity evaluated the comfort and function during running of the ISS harness used with a new SLD in a system that allows more even distribution of the load between the waist and shoulders. METHODS: Using a zero-gravity locomotion simulator, 12 subjects completed three 5-min running trials at a constant speed (3.35 m x s(-1)) using three SLD loads [50%, 75%, and 100% of bodyweight (BW)] presented at random and a shoulder-to-waist loading ratio of 50:50. Subjective ratings of discomfort, ground reaction forces (GRFs), and SLD loads were collected. RESULTS: A load of 100% BW resulted in similar GRF profiles (peak and rate of change of force) to those reported for 1-g running over ground and were also comfortably tolerated (mean Borg scale rating 3.9/10). DISCUSSION: With an appropriate harness and SLD system, 1-g-like GRF profiles can be generated at the feet during simulated microgravity running. Such forces can be achieved with a level of discomfort rated better than "somewhat uncomfortable," suggesting that running with 1-g loads could be an effective component of musculoskeletal countermeasures during long-duration spaceflight. |
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Authors:
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Kerim O Genc; Vince E Mandes; Peter R Cavanagh |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Aviation, space, and environmental medicine Volume: 77 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2006 Nov |
Date Detail:
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Created Date: 2006-11-07 Completed Date: 2007-01-17 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: 1117-24 Citation Subset: IM; S |
Affiliation:
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Department of Biomedical Engineering, The Cleveland Clinic, Cleveland, OH 44195, USA. genck@ccf.org |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Biomechanics Exercise / physiology* Female Humans Male Running / physiology* Space Flight Weight-Bearing / physiology Weightlessness Countermeasures* Weightlessness Simulation* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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