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. 2018 Nov 1;5:97. doi: 10.3389/fnut.2018.00097

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Copyright © 2018 Roberson, Romero, Mumford, Osburn, Haun, Vann, Kluess and Roberts.

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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Training data represented as mean ± SD. “G” = group effect p-value, “T” = time effect p-value, “G×T” = group × time interaction p-value. (A) Average distance (km) run per week for the placebo group (PLA; gray) and protein group (PRO; black). There was not a significant group by time interaction or group effect (p > 0.05), however, there was a time effect (p < 0.05) whereby pairwise comparisons determined a significant difference between week 1 and weeks 6, 7, 8, and 9 (“§”, p < 0.05). (B) Average hours spent running per week for each group. A significant time effect existed (p < 0.05) whereby pairwise comparisons determined differences between week 1 and weeks 6, 7, 8, and 9 (“§”, p < 0.05). (C) Average pace for each group was not significantly different (p>0.05). Volume was increased weeks 1–3, 5–7, and 9, and weeks 4 and 8 were recovery weeks. Week 10 was a taper leading into post testing. Forced independent t-tests were conducted at each time point to determine any possible group differences and revealed no significant differences (p > 0.05).