FCM-MG), Pós-Graduação em Ciências da Saúde Background/Objective: Type 1 diabetes mellitus (DM1) presents important risk factors for cardiovascular events.Objective: To compare the components of the aortic pulse wave (APW) and the hemodynamic parameters among children and adolescents with DM1 and healthy individuals.Methods: This is a cross-sectional study, with 36 children and adolescents diagnosed with DM1 (11.9 AE 3.2 years) matched by sex and age with the control group (n = 36, 12.4 AE 2.9 years).The components of the APW and the hemodynamic parameters were evaluated non-invasively, using Mobil-O-Graph. Results: On the week of the evaluation, DM1 patients presented glycated hemoglobin (hemoglobin A1C [HbA1c]) of 9.48 AE 2.22% and fasting glycemia of 222.58 AE 93.22 mg/dL. Augmentation index (AIx@75), reflection coefficient, and augmentation pressure (AP) were significantly higher in the DM1 group (29.0 AE 9.7%, 63.0 AE 7.9, and 7.8 AE 2.7 mm Hg, respectively) compared with the control group (20.6 AE 7.9%, 53.4 AE 9.1 and 4.9 AE 2.1 mm Hg, respectively). The systolic volume (52.6 AE 11.9 and 60 AE 12.4 mL) and the cardiac output (4.3 AE 0.5 and 4.6 AE 0.5 L/min) decreased in the DM1 group in relation to the control group. The pulse pressure amplification (PPA) was significantly lower in the DM1 group (1.4 AE 0.15) compared with the control group (1.6 AE 0.17). PPA correlated negatively with total vascular resistance (TVR), AP and reflection coefficient, and positively with cardiac index in both groups. In the DMI group, the AIx@75 correlated negatively with age, height, systolic volume, and PPA, and correlated positively with the TVR and reflection coefficient. Conclusions: These results confirm the presence of arterial stiffness in this population and extend the knowledge, showing, for the first time, the reduction of PPA in the DM1 group.