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. 2017 Aug 2;8:515. doi: 10.3389/fphys.2017.00515

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Copyright © 2017 Treff, Winkert, Sareban, Steinacker, Becker and Sperlich.

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) or licensor 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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Polarization-Index of a pyramidal (PYR) and a polarized rowing training group (POL) during 11 weeks of intervention and pre-/post-testing. Polarization-Index = log (%Zone 1 × %Zone 3 / %Zone 2). See text for details. Broken line indicates Polarization-Index of 2 a.u., which is defined being the cut off between polarized (> 2) and not polarized (≤2 a.u.) training intensity distribution. The high percentage of Zone 3 in calendar weeks 3 and 13 was due to the pre-/post-testing.