American College of Sports Medicine 2010a ACSM’s Resource manual for guidelines for exercise testing and prescription 6th Edition Philadelphia: Wolters Kluwer/Lippincott Williams and Wilkins

American College of Sports Medicine 2010b ACSM’s Guidelines for exercise testing and prescription 8th Edition Philadelphia: Wolters Kluwer/Lippincott Williams and Wilkins

World Health Organisation Waist circumference and waist-hip ratio: report of WHO expert consultation, Geneva, 8-11 December 2008 http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.418.302&rep=rep1&type=pdf