| Influence of intensity fluctuation on exercise metabolism. | |
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MedLine Citation:
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PMID: 17323070 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This investigation was undertaken to examine the influence of intensity fluctuation on metabolic responses during and after exercise. Twenty-four males and 24 females were randomly assigned into one of the four groups consisting of 12 subjects of equal gender. Each group performed one of four 30-min exercise protocols: (1) cycling at a constant power output of 75 W (P1), (2) cycling with power output alternating between 50 and 100 W every 5 min (P2), (3) same as P2 except power output was alternated in a reverse order (P3), and (4) same as P2 except power output was alternated between 25 and 125 W (P4). Each exercise session was followed by a 25-min recovery and all protocols yielded the same mechanical work. Oxygen uptake (VO(2)), heart rate (HR), respiratory exchange ratio (RER), and plasma lactate concentrations ([La]) were measured at rest and during exercise and recovery. Ratings of perceived exertion (RPE) were recorded during exercise only. During exercise, VO(2), HR and RPE did not differ across the four protocols. RER was higher (P < 0.05) in P4 than P1 and P2. [La] was higher (P < 0.05) in P4 than P1 and P3. During recovery, VO(2) were lower (P < 0.05) in P1 than P2, P3, and P4, while [La] was higher in P4 than P3. When the total workload was equated, intensity fluctuation exerted no added effect upon metabolic responses during exercise, but provoked greater energy expenditure following exercise. Reversing the order or increasing the magnitude of intensity fluctuation would not further alter metabolic consequences. |
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Authors:
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Jie Kang; Gerald T Mangine; Nicholas A Ratamess; Avery D Faigenbaum; Jay R Hoffman |
Publication Detail:
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Type: Journal Article; Randomized Controlled Trial Date: 2007-02-24 |
Journal Detail:
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Title: European journal of applied physiology Volume: 100 ISSN: 1439-6319 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-05-03 Completed Date: 2007-10-18 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 100954790 Medline TA: Eur J Appl Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 253-60 Citation Subset: IM |
Affiliation:
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Human Performance Laboratory, Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ 08068, USA. kang@tcnj.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Energy Metabolism / physiology* Exercise / physiology* Female Heart Rate / physiology Humans Lactates / blood Male Oxygen Consumption / physiology Physical Exertion / physiology* Pulmonary Gas Exchange / physiology Respiration Rest / physiology |
| Chemical | |
Reg. No./Substance:
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0/Lactates |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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