| Effect of expiratory resistive loading on inspiratory and expiratory muscle fatigue. | |
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MedLine Citation:
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PMID: 19442933 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Inspiratory and expiratory pressures are increased during expiratory resistive loading (ERL). We asked whether ERL elicits inspiratory as well as expiratory muscle fatigue. On four separate days, seven male subjects underwent ERL to task failure. Subjects maintained respiratory frequency at 15 breaths min(-1), expiratory gastric pressure at 40% or 60% of maximum, and expiratory duty cycle at 0.4 or 0.7 (ERL(40%0.4), ERL(40%0.7), ERL(60%0.4), ERL(60%0.7)). Inspiratory and abdominal muscle contractility was assessed before and up to 30 min after ERL by measuring transdiaphragmatic twitch pressure (P(di,tw)) and gastric twitch pressure (P(ga,tw)) in response to magnetic nerve stimulation. After each trial, P(di,tw) and P(ga,tw) were reduced below baseline values (-9 to -15% for P(di,tw) and -15 to -22% for P(ga,tw); P<0.05). The severity of diaphragm fatigue was unaffected by expiratory pressure production or expiratory duty cycle, whereas extending the expiratory duty cycle increased the severity of abdominal muscle fatigue. In conclusion, ERL elicits contractile fatigue of the diaphragm and the abdominal muscles. |
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Authors:
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Bryan J Taylor; Lee M Romer |
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Publication Detail:
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Type: Journal Article Date: 2009-03-20 |
Journal Detail:
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Title: Respiratory physiology & neurobiology Volume: 166 ISSN: 1878-1519 ISO Abbreviation: Respir Physiol Neurobiol Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-05-15 Completed Date: 2009-08-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101140022 Medline TA: Respir Physiol Neurobiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 164-74 Citation Subset: IM |
Affiliation:
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Centre for Sports Medicine and Human Performance, Brunel University, Uxbridge, Middlesex UB8 3PH, UK. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Airway Resistance / physiology* Electromyography / methods Evoked Potentials, Motor / physiology Exhalation* Humans Inhalation* Magnetics / methods Male Muscle Contraction / physiology Muscle Fatigue / physiology* Physical Stimulation Pressure Psychophysics Reproducibility of Results Respiratory Function Tests / methods Respiratory Muscles / physiology* Statistics, Nonparametric Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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