| The between and within day variation in gross efficiency. | |
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MedLine Citation:
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PMID: 20464413 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Before the influence of divergent factors on gross efficiency (GE) [the ratio of mechanical power output (PO) to metabolic power input (PI)] can be assessed, the variation in GE between days, i.e. the test-retest reliability, and the within day variation needs to be known. Physically active males (n = 18) performed a maximal incremental exercise test to obtain VO2max and PO at VO2max (PVO2max), and three experimental testing days, consisting of seven submaximal exercise bouts evenly distributed over the 24 h of the day. Each submaximal exercise bout consisted of six min cycling at 45, 55 and 65% PVO2max, during which VO(2) and RER were measured. GE was determined from the final 3 min of each exercise intensity with: GE = (PO/PI) x 100%. PI was calculated by multiplying VO2 with the oxygen equivalent. GE measured during the individually highest exercise intensity with RER <1.0 did not differ significantly between days (F = 2.70, p = 0.08), which resulted in lower and upper boundaries of the 95% limits of agreement of 19.6 and 20.8%, respectively, around a mean GE of 20.2%. Although there were minor within day variations in GE, differences in GE over the day were not significant (F = 0.16, p = 0.99). The measurement of GE during cycling at intensities approximating VT is apparently very robust, a change in GE of approximately 0.6% can be reliably detected. Lastly, GE does not display a circadian rhythm so long as the criteria of a steady-state VO(2) and RER <1.0 are applied. |
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Authors:
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Dionne A Noordhof; Jos J de Koning; Teun van Erp; Bart van Keimpema; Daan de Ridder; Ruby Otter; Carl Foster |
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Publication Detail:
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Type: Journal Article Date: 2010-05-13 |
Journal Detail:
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Title: European journal of applied physiology Volume: 109 ISSN: 1439-6327 ISO Abbreviation: Eur. J. Appl. Physiol. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-23 Completed Date: 2010-11-26 Revised Date: - |
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: 1209-18 Citation Subset: IM |
Affiliation:
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Department of Human Movement Sciences, VU University-Amsterdam, Van Der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands. d.noordhof@fbw.vu.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Circadian Rhythm / physiology* Energy Metabolism / physiology* Humans Male Oxygen Consumption / physiology* Physical Endurance / physiology* Physical Exertion / physiology* Task Performance and Analysis* |
| Comments/Corrections | |
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