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. 2018 Jul 20;9:963. doi: 10.3389/fphys.2018.00963

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Copyright © 2018 Birnbaumer, Müller, Tschakert, Sattler and Hofmann.

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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Respiratory exchange ratio (RER) in non-MPC and MPC (means ± SD). X-axis is plotted in three segments whereby parts between warm-up and MPC as well as between MPC and PU where cut for clarity.