1. Åstrand Laboratory of Work Physiology; The Swedish School of Sport and Health Sciences; Stockholm Sweden
2. Elite Performance Centre; Bosön, Swedish Sports Confederation; Lidingö Sweden
3. Department of Cardiology; Karolinska Institute; Karolinska University Hospital; Stockholm Sweden
4. Department of Laboratory Medicine; Clinical Physiology; Karolinska Institutet; Huddinge Sweden
5. The Copenhagen Muscle Research Centre; Rigshospitalet; Copenhagen N Denmark
6. Department of Physical Education; University of Las Palmas de Gran Canaria; Las Palmas de Gran Canaria Spain
7. Research Institute of Biomedical and Health Sciences (IUIBS); Las Palmas de Gran Canaria Spain
8. School of Kinesiology; University of British Columbia; Vancouver BC Canada