About the Authors

Billy Sperlich

sperlich@uni-wuppertal.de

Affiliations Department of Sport Science, University of Wuppertal, Wuppertal, Germany, Department of Sport Science, University AF Munich, Munich, Germany

Dennis-Peter Born

Affiliation Department of Sport Science, University of Wuppertal, Wuppertal, Germany

Kimmo Kaskinoro

Affiliations Turku PET Centre, University of Turku, Turku, Finland, Anesthesiology and Intensive Care, University of Turku, Turku, Finland

Kari K. Kalliokoski

Affiliation Turku PET Centre, University of Turku, Turku, Finland

Marko S. Laaksonen

Affiliation Swedish Winter Sports Research Centre, Department of Health Sciences, Mid Sweden University, Östersund, Sweden

Competing Interests

BS and DPB had travel costs to Turku, Finland, paid by SIGVARIS for data acquisition. BS has received consultancy fee by SIGVARIS on other previous projects other than the present one. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials. None of the other authors have any ownership of stocks, employment or board membership at SIGVARIS AG or other companies with competing interests with relation to data presented here, neither financial, professional, nor personal.

Author Contributions

Conceived and designed the experiments: BS DPB KK KKK MSL. Performed the experiments: BS DPB KK KKK MSL. Analyzed the data: BS DPB KK KKK MSL. Contributed reagents/materials/analysis tools: BS DPB KK KKK MSL. Wrote the paper: BS DPB KK KKK MSL.