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. 2020 Aug 11;11:1968. doi: 10.3389/fpsyg.2020.01968

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Copyright © 2020 Marinho, Barbosa, Lopes, Forte, Toubekis and Morais.

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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Performance and efficiency variables clustered by the coaches’ coaching level. Performance, 100 m freestyle performance; velocity, swim velocity; SL, stroke length; SI, stroke index; η_F, Froude efficiency; dv, intracyclic variation of the swimmer’s velocity; F_r, Froude number; C_Da, active drag coefficient; R_e, Reynolds number. 1, coaching level 1; 2, coaching level 2; 3, coaching level 3. ^∗Significant differences (p < 0.05) between: 2 vs. 1, and 2 vs. 3.