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. 2019 Apr 24;10:451. doi: 10.3389/fphys.2019.00451

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Copyright © 2019 Amaro-Gahete, De-la-O, Jurado-Fasoli, Dote-Montero, Gutiérrez, Ruiz and Castillo.

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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Changes in the trunk extensor isometric test (A), trunk flexor isometric test (B), side bridge test (C), and front plank test (D) after the intervention study among the four groups. Data are shown as means ± standard deviation. Parallel bars indicate significant differences between groups applying an analysis of covariance adjusting by baseline values, with post hoc Bonferroni-corrected t-test (^∗P < 0.05, ^∗∗P < 0.01, ^∗∗∗P < 0.001). PAR, physical activity recommendations for adults proposed by the World Health Organization group; HIIT, high intensity interval training group; WB-EMS, whole-body electromyostimulation group.