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. 2018 Apr 17;9:395. doi: 10.3389/fphys.2018.00395

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Copyright © 2018 Schmitz, Rolfes, Schelleckes, Mewes, Thorwesten, Krüger, Klose and Brand.

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 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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miR-222 and miR-29c levels during incremental continuous running test (ICRT) at baseline and follow-up. Five participants from either HIIT group were randomly selected and miRNA levels were determined during ICRT at (A,C) baseline and (B,D) follow-up. No significant change in miR-222 (red) or-29c (blue) levels was detected during ICRT or subsequent recovery (R3, R5). At follow-up, variation of miRNAs levels was reduced in the 4 × 30 HIIT group indicated by decreased widths of 95% CIs (gray) but not in the 8 × 15 HIIT group. Data are represented as mean with linear regression and 95% CI. R3, after 3 min of rest; R5, after 5 min of rest.