1. Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
2. Department of Mathematics and Statistics, University of Jyväskylä, Jyväskylä, Finland
3. Finnish Institute of High-Performance Sport KIHU, Jyväskylä, Finland
4. Department of Health Science, Luleå University of Technology, Luleå, Sweden