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. 2021 Feb 6;5(1):e14–e23. doi: 10.1055/s-0040-1721782

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. ( https://creativecommons.org/licenses/by/4.0/ )

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 work is properly cited.

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Fig. 2 — Maximal oxygen uptake in the two study groups during the study period. The lines show mean (95% confidence intervals) differences from baseline in VO _2max levels in the intervention group (blue stippled line, n = 29/22/21 at 6 and 12 months, respectively) and the control group (red line, n = 25/24/23 at 6 and 12 months, respectively). The asterisk denotes a significant difference (mixed model adjusting for baseline values,* p = 0.005) between the two study groups with regard to the main group effect.