1 School of Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, EX1 2LU, UK. M.I.Black@exeter.ac.uk.
2 Human Performance Science Research Group, Institute of Sport Physical Education and Health Sciences, Moray House School of Education and Sport, University of Edinburgh, Edinburgh, UK.
3 Faculty of Behavioural and Movement Sciences, Physiology, Vrije Universiteit Amsterdam, Amsterdam, Netherlands.
4 Department of Human Biology, Health Through Physical Activity, Lifestyle and Sport Research Centre, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.