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. 2019 Apr 5;10:365. doi: 10.3389/fphys.2019.00365

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Copyright © 2019 Berg, Undebakke, Rasch-Halvorsen, Aakerøy, Sandbakk and Tjønna.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Correlation between peak oxygen uptake (VO_2peak) in running and respiratory flux for M. vastus lateralis with both groups individually. (A) leak respiration in absence of adenylates (L_N), (B) fatty acid oxidative capacity (P_ETF), (C) complex I respiration (P_CI), (D) complex I and complex II respiration combined (P_CI+CII), (E) electron transfer system capacity (E_CI+CII) and (F) electron transfer system capacity of complex II alone (E_CII). ■ = CON, ○ = XC skiers.