| Oxygen consumption during walking and running under fractional weight bearing conditions. | |
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MedLine Citation:
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PMID: 20540445 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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INTRODUCTION: Knowledge of changes in oxygen consumption during reduced body weight loading at different speed levels is important, in particular in astronauts who may lose aerobic fitness as well as in clinical patients (e.g., in obese individuals at walking speeds or in injured athletes at running speeds). Therefore, the aim of this study was to analyze oxygen consumption during unloaded walking and running. METHODS: Oxygen consumption (Vo2), heart rate (HR), and Borg rating of perceived exertion (Borg RPE) were quantified in 10 healthy young female and male volunteers at 3 body weight (BW) conditions (100%, 66%, and 33% BW) and 4 treadmill speeds (slow walking at 0.4 m x s(-1), comfortable walking at 1.3 m x s(-1), slow running at 2.2 m x s(-1), and moderately fast running at 3.1 m x s(-1)). Unloading was achieved in a waist-high chamber with increased pressure called Lower Body Positive Pressure (LBPP). RESULTS: All parameters (Vo2, HR, and Borg RPE) decreased during unloaded walking and running. Interestingly, our findings confirm a specific linear relationship between each parameter and treadmill speed for each BW condition with smaller slope angles at higher levels of unloading (e.g., for Vo2, the slope angle decreased from 11.9 at 100% BW to 4.4 at 33% BW). DISCUSSION: Oxygen consumption, heart rate, and Borg rating of perceived exertion are reduced during unloaded exercise with a relatively greater decline at higher treadmill speeds. That is, the higher the treadmill's speed in unloaded conditions, the relatively "easier" it is to exercise. |
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Authors:
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Heidi Ruckstuhl; Thomas Schlabs; Armando Rosales-Velderrain; Alan R Hargens |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Aviation, space, and environmental medicine Volume: 81 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-06-14 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: 550-4 Citation Subset: IM; S |
Affiliation:
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Department of Orthopaedic Surgery, University of California, UCSD Medical Center, San Diego 92103, USA. heidi.ruckstuhl@gmail.com |
Export Citation:
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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M01RR000827/RR/NCRR NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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