 The results of this study suggest that young patients with congenital heart disease, CHD, have reduced aerobic capacity and cardiorespiratory efficiency during exercise, which is reflected by a lower RR overshoot during recovery. Furthermore, the RR magnitude was found to be correlated with the most relevant cardiorespiratory fitness and efficiency indices. This suggests that the RR recovery overshoot's analysis should be part of routine CPT evaluation to further improve prognostic risk stratification in patients with CHD. This article was authored by Marco Vecchiato, Andrea Hermoleo, Emanuele Zanardo, and others.