We analyzed the kinetics of heart rate (HR) response during incremental treadmill exercise in thirteen master runners (62 ± 1 yr). The HR/running speed (HR/S) relationship showed the existence of a point of downward deflection (HRd) in only ~31% of the subjects. Resting echocardiographic evaluations showed similar heart dimensions in all of the subjects. In conclusion, HR does not seem to show a curvilinear response (downward deflection) in most aged athletes.