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. 2014 Apr 15;9(4):e95025. doi: 10.1371/journal.pone.0095025

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© 2014 Kilen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Maximal oxygen uptake (VO_2max) determined during freestyle swimming in a swimming flume with increasing water speed until exhaustion in two groups of swimmers before (PRE) and after (POST) a training intervention. One group performed usual swim-training (CON) and another group reduced their training volume by 50% and more than doubled the amount of high-intensity training (HIT). On average, VO_2max was similar before and after the 12 week intervention period in both groups. Individual data is presented. Open circles: male; Closed circles: female.