About the Authors
- Ji-Guo Yu
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Affiliation Department of Surgical and Perioperative Sciences, Sports Medicine Unit and School of Sport Sciences, Umeå University, Umeå, Sweden
- Patrik Bonnerud
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Affiliation Department of Health Sciences, Luleå University of Technology, Luleå, Sweden
- Anders Eriksson
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Affiliation Department of Health Sciences, Luleå University of Technology, Luleå, Sweden
- Per S. Stål
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Affiliation Department of Integrative Medical Biology, Section for Anatomy, Umeå University, Umeå, Sweden
- Yelverton Tegner
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Affiliation Department of Health Sciences, Luleå University of Technology, Luleå, Sweden
- Christer Malm
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* E-mail: Christer.malm@idrott.umu.se
Affiliations Department of Surgical and Perioperative Sciences, Sports Medicine Unit and School of Sport Sciences, Umeå University, Umeå, Sweden, Winternet, Boden, Sweden
Competing Interests
Christer Malm has part-time employment at the non-profit organization (an economical union) Winternet, Boden, Sweden since 2001. Some of the work for the manuscript was executed using equipment at Winternet. All data, ethical permission, potential patents etc. are filed under Sports Medicine Unit, Umeå University (EPN nr 08–145M). Thus, all past and present data belong to Umeå University. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: CM AE YT PB. Performed the experiments: CM PS AE YT PB. Analyzed the data: JGY CM PS AE YT PB. Contributed reagents/materials/analysis tools: CM PS. Contributed to the writing of the manuscript: JGY CM PS AE YT PB.