1. Neuromuscular Research Center and Department of Biology of Physical Activity, University of Jyväskylä, 40351 Jyväskylä;
2. Department of Clinical Chemistry, University of Oulu, 90220 Oulu, Finland;
3. The Human Performance Laboratory, Ball State University, Muncie, Indiana 47306;
4. Department of Physical Medicine and Rehabilitation, Central Hospital, 40620 Jyväskylä;
5. Department of Health Sciences, University of Jyväskylä, 40351 Jyväskylä; and
6. Department of Physical Medicine and Rehabilitation, Kuopio University Hospital, 70211 Kuopio, Finland