PMID: 11932575Apr 5, 2002Paper

Muscle fiber type distribution and nonlinear .VO(2)-power output relationship in cycling

Medicine and Science in Sports and Exercise
Preben K PedersenKlaus Levin

Abstract

We examined whether reported deviations from linearity of the oxygen uptake (.VO(2))-to-power output (W) relationship during intense cycling exercise correlated with the percentage Type II fibers in the exercising muscle. Twelve trained young men with known fiber type distribution in the vastus lateralis muscle performed step-increment exercise (40 W.3 min(-1)) to exhaustion. .VO(2) increased linearly with W up to about 50% .VO(2max) with a regression equation of .VO(2) (mL.min-1) = 661 + 9.73 W and a correlation coefficient (r) of 1.000. Subsequent .VO(2) values were all greater than corresponding linear estimates (P < 0.001 or 0.0001). Peak exercise excess .VO(2) (measured minus estimated .VO(2) assuming linearity) averaged (SD) 434 (192) mL O(2).min-1 or 10.3 (4.7) % .VO(2max). A comprehensive curvilinearity index defined as the sum of measured minus estimated .VO(2) at the four highest completed exercise trials averaged 973 (460) mL O(2).min-1 or 21.5 (9.4) % .VO(2max). Correlations between percentage Type II fibers and either of the two expressions of curvilinearity were nonsignificant. Delta [H+] (arterialized capillary blood) from basal level to peak exercise correlated with the submaximal curvilinearity index (r = 0.59-...Continue Reading

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Citations

Mar 28, 2020·European Journal of Sport Science·Víctor Cerezuela-EspejoJesús G Pallarés
Nov 5, 2011·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·David W Hill, Jakob L Vingren
Oct 5, 2015·European Journal of Applied Physiology·Eloisa LimontaFabio Esposito
Jun 25, 2021·Journal of Applied Physiology·Massimo VenturelliFederico Schena

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