Inclusion Criteria:  Age 18-35 years, New onset type 1 diabetes (confirmed by the presence of antibodies - antyGAD, ICA, IA2) Treatment with intensive insulin therapy, Written consent to participate in the study.  Exclusion Criteria:  Contraindications to the exercise test (including: recent myocardial infarction, unstable coronary artery disease, hypertrophic cardiomyopathy, serious arrhythmias, myocarditis, advanced systemic diseases, hyperthyroidism, recurrent anemia), Mental disorders, Co-morbidities with potential impact on physical performance (e.g. cancer, renal failure, liver failure, rheumatic diseases, COPD, asthma, anemia, hypothyroidism and hyperthyroidism), Pregnancy.