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The between and within day variation in gross efficiency

Content Provider	PubMed Central
Author	Noordhof, Dionne A. Koning, Jos J. De Erp, Teun Van Van, Keimpema Bart Ridder, Daan De Otter, Ruby Foster, Carl
Abstract	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 VO2 and RER were measured. GE was determined from the final 3 min of each exercise intensity with: GE = (PO/PI) × 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 ~0.6% can be reliably detected. Lastly, GE does not display a circadian rhythm so long as the criteria of a steady-state VO2 and RER <1.0 are applied.
Related Links	http://dx.doi.org/10.1007/s00421-010-1497-4
Starting Page	1209
File Format	PDF
ISSN	14396327
e-ISSN	14396327
Journal	European Journal of Applied Physiology
Issue Number	6
Volume Number	109
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-08-01
Access Restriction	Open
Rights Holder	Springer-Verlag
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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