Comparing Cardio Stress Index between sedentary and active populations - Henning, E.; Terblanche, H.C.; Kleynhans, M.; Crafford, D.; Wood, P.; Grant, C.; du Toit, P.J. (Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / South African Journal of Science and Technology, 2014)