| A mechanomyographic fatigue threshold test for cycling. | |
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MedLine Citation:
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PMID: 20589588 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purposes of this study were twofold: 1) to derive the mechanomyographic mean power frequency fatigue threshold (MMG MPFFT) for submaximal cycle ergometry; and 2) to compare the power outputs associated to the MMG MPFFT to other neuromuscular and gas exchange fatigue thresholds. 9 adults (5 men and 4 women; mean+/-SD age=23.7+/-3.7 years; body weight=66.3+/-8.2 kg) performed an incremental cycle ergometry test to exhaustion while expired gas samples, electromyographic (EMG), and MMG signals were measured from the vastus lateralis muscle. The non-significant correlations (r=0.17 to 0.66; p>0.05) among the physical working capacity at the fatigue threshold (PWCFT), MMG MPFFT, and gas exchange threshold (GET) suggested that different physiological mechanisms may underlie these 3 fatigue thresholds. A significant correlation (r=0.83) for the MPFFT vs. respiratory compensation point (RCP) suggested that these fatigue thresholds may be mediated by a common physiological mechanism. In addition, the significantly lower mean values found for the PWCFT (mean+/-SD=163+/-43 W), MMG MPFFT (132+/-33 W), and GET (144+/-28 W) than MPFFT (196+/-53 W) and RCP (202+/-41 W) suggested that these gas exchange and neuromuscular fatigue thresholds may demarcate different exercise intensity domains. |
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Authors:
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J M Zuniga; T J Housh; C L Camic; C R Hendrix; R J Schmidt; M Mielke; G O Johnson |
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Publication Detail:
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Type: Journal Article Date: 2010-06-29 |
Journal Detail:
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Title: International journal of sports medicine Volume: 31 ISSN: 1439-3964 ISO Abbreviation: Int J Sports Med Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-31 Completed Date: 2010-12-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8008349 Medline TA: Int J Sports Med Country: Germany |
Other Details:
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Languages: eng Pagination: 636-43 Citation Subset: IM |
Copyright Information:
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Georg Thieme Verlag KG Stuttgart . New York. |
Affiliation:
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University of Nebraska-Lincoln, Nutrition and Health Sciences, Lincoln, Nebraska 68583-0806, United States. jzuniga2@unlserve.unl.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling / physiology* Ergometry Exercise Test / methods* Female Humans Male Muscle Fatigue / physiology* Muscle, Skeletal / physiology Myography / methods Pulmonary Gas Exchange / physiology Young Adult |
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