Abreu, Ana2025-04-112025-04-112025Rev Port Cardiol. 2025 Apr;44(4):229-2310870-25512174-2030http://hdl.handle.net/10400.5/100146© 2025 Sociedade Portuguesa de Cardiologia. Published by Elsevier Espa˜na, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)The present study by Lima et al. “Validation of an Aerobic Fitness Questionnaire to estimate VO2 peak in a cohort of adult cardiac patients – Is it enough?”, intends to validate the CLINIMEX Aerobic Fitness Questionnaire (C-AFQ),3 comprising a list of activities, in a Portuguese population sample of 124 CV patients (93% male, mean age 61 years old, 61% with heart failure), who were referred for CPET and cardiac rehabilitation. In this prospective study, which enrolled exclusively CV patients (mainly male), C-AFQ was not sufficiently accurate to predict functional capacity measured by VO2 peak. Despite a numerically strong and positive correlation between measured and estimated, by C-AFQ, VO2 peak (r=0.723, p<0.001), high levels of disagreement in the Bland–Altman plot analysis were observed.engjournal article10.1016/j.repc.2025.03.001