Abstract
Chronic endurance training increases an athlete’s aerobic capacity and results in improved
cardiocirculatory work economy, maximum performance, and enhanced oxygen uptake. The extent of
the adaptation depends on individual factors such as frequency, intensity, and duration of training,
muscle fibre type, and genetics. The functional range of heart rate, cardiac contractility, diastolic
function, and blood pressure increases, while cardiocirculatory work is more economical, and
maximum oxygen uptake (VO2max) is improved.