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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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Differences in respiratory flux in M. triceps brachii and M. vastus lateralis between elite cross-country skiers (XC skiers) and physically active controls (CON). (A) M. vastus lateralis and (B) M. triceps brachii. Respiratory flux expressed as mass-specific respiratory capacity (pmol⋅s^-1⋅mg^-1) for leak respiration in absence of adenylates (L_N), fatty acid oxidative capacity (P_ETF), complex I respiration (P_CI), complex I and II respiration combined (P_CI+CII), electron transfer system capacity (E_CI+CII), electron transfer system capacity of complex II alone (E_CII) and residual oxygen consumption (ROX). Data are displayed as means ± SD. ^∗Significant difference between groups (P < 0.001).