| Low-magnitude whole body vibration with resistive exercise as a countermeasure against cardiovascular deconditioning after 60 days of head-down bed rest. | |
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MedLine Citation:
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PMID: 21900640 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Whole body vibration with resistive exercise is a promising countermeasure against some weightlessness-induced dysfunctions. Objective: to study if the combination of low-magnitude whole body vibration with a resistive exercise can prevent the cardiovascular deconditioning induced by a non-strict 60-day head-down bed rest (ES-IBREP study: Earth Star International Bed Rest Experiment Project). Methods: Fourteen healthy men participated in this study. We recorded electrocardiogram and blood pressure wave by means of a non-invasive beat-by-beat measurement system ("Cardiospace" integrated by CNES and ACC) during an orthostatic test (20 min of 75° head-up tilt test) before and immediately after bed rest. We estimated heart rate, blood pressure, cardiac output, stroke volume, total peripheral resistance, baroreflex sensitivity, and heart rate variability. Results: Low-magnitude whole body vibration with resistive exercise prevented an increase of the sympathetic index (reflecting the sympathovagal balance of cardiac autonomic control) and limited the decrease of the spontaneous baroreflex sensitivity induced by 60 days of head-down bed rest. However, this countermeasure had very little effect on cardiac hemodynamic and did not improve the orthostatic tolerance. Conclusion: This combined countermeasure did not efficiently prevent orthostatic intolerance, but prevents changes in the autonomic nervous system associated with cardiovascular deconditioning. The underlying mechanisms remain hypothetical but might involve cutaneous and muscular mechanoreceptors. |
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Authors:
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Mickael Coupe; Ming Yuan; Claire Demiot; Yanqiang Bai; Shizhong Jiang; Yongzhi Li; Philippe Arbeille; Guillemette Gauquelin-Koch; Thibaud Levrard; Marc-Antoine Custaud; Yinghui Li |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-7 |
Journal Detail:
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Title: American journal of physiology. Regulatory, integrative and comparative physiology Volume: - ISSN: 1522-1490 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-8 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100901230 Medline TA: Am J Physiol Regul Integr Comp Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1Faculté de médecine d'Angers. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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