1. a Exercise and Health Sciences, School of Science , University of the West of Scotland , Hamilton , Scotland
2. b Centre for Child Research, School of Human Sciences , Swansea University , Swansea , United Kingdom
3. c Cardiff School of Sport , University of Wales Institute , Cardiff , Wales , United Kingdom
4. d Division of Health and Science , University of Glamorgan , Pontypridd , United Kingdom
5. e Exercise Physiology Laboratories, Exercise Science Program, Department of Health, Exercise and Sports Sciences , the University of New Mexico , Albuquerque , New Mexico , USA