1. Department of Physiological Sciences; Stellenbosch University; Merriman avenue Stellenbosch 7600 Western Cape South Africa
2. Institute for Biomedical Research into Human movement; School of Healthcare Science; Manchester Metropolitan University; Oxford road M1 5GD Manchester U.K.
3. Research Institute for Sport and Exercise Sciences; School of Sport and Exercise Sciences; Liverpool John Moores University; Liverpool U.K.