Authors’ contributions
MAY
Britt Elin Øiestad, Margreth Grotle, and May Arna Risberg designed the trial and wrote the funding application. Britt Elin Øiestad and May Arna Risberg developed the interventions and testing protocols. Britt Elin Øiestad recruited and tested participants, conducted statistical analyses, and was first author of the paper. Asbjørn Årøen, Jan Harald Røtterud and Nina Østerås recruited participants, and contributed with interpretation of the data. Even Jarstad planned the VO2max exercise and testing protocol and tested all participants. All authors critically reviewed the data analyses, revised, and approved the final manuscript. All authors agree to be accountable for all aspects of the work in ensuring accuracy or integrity of any part of the work are appropriately investigated and resolved.