| Upright exercise or supine lower body negative pressure exercise maintains exercise responses after bed rest. | |
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MedLine Citation:
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PMID: 9243488 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Adaptation to bed rest or space flight is accompanied by an impaired ability to exercise in an upright position. We hypothesized that a daily, 30-min bout of intense, interval exercise in upright posture or supine against lower body negative pressure (LBNP) would maintain upright exercise heart rate and respiratory responses after bed rest. Twenty-four men (31 +/- 3 yr) underwent 5 d of 6 degree head-down tilt: eight performed no exercise (CON), eight performed upright treadmill exercise (UPex), and eight performed supine treadmill exercise against LBNP at -51.3 +/- 0.4 mm Hg (LBNPex). Submaximal treadmill exercise responses (56, 74, and 85% of VO2peak) were measured pre- and post-bed rest. In CON, submaximal heart rate, respiratory exchange ratio, and ventilation were significantly greater (P < or = 0.05) after bed rest. In UPex and LBNPex, submaximal exercise responses were similar pre- and post-bed rest. Our results indicate that a daily 30-min bout of intense, interval upright exercise training or supine exercise training against LBNP is sufficient to maintain upright exercise responses after 5 d of bed rest. These results may have important implications for the development of exercise countermeasures during space flight. |
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Authors:
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S M Lee; B S Bennett; A R Hargens; D E Watenpaugh; R E Ballard; G Murthy; S R Ford; S M Fortney |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 29 ISSN: 0195-9131 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 1997 Jul |
Date Detail:
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Created Date: 1997-09-23 Completed Date: 1997-09-23 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 892-900 Citation Subset: IM; S |
Affiliation:
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KRUG Life Sciences, Inc., Houston, TX, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bed Rest* Biomechanics Exercise / physiology* Exercise Test Gravitation* Heart Rate Humans Lower Body Negative Pressure* Male Posture Respiratory Function Tests Space Flight* |
| Grant Support | |
ID/Acronym/Agency:
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M01 RR00073/RR/NCRR NIH HHS |
| Investigator | |
Investigator/Affiliation:
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A R Hargens / ARC; S M Fortney / JSC |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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