Dr Fang Qin Goh
Introduction
With semi-professional sporting events becoming more accessible,1 the effect of endurance training on the body is increasingly relevant, not just in elite athletes, but also fitness enthusiasts. Exercise prevents and aids treatment of coronary heart disease (CHD), hypertension, heart failure, diabetes mellitus, obesity and depression,2,3 reduces cardiac events,1 and improves survival.4,5 However, there is concern excessive exercise could have adverse cardiac effects.2 This article aims to address whether an upper limit to mortality benefits of exercise exists, consider physiological and potentially pathological ch