Context and aim: Physical acNvity is associated with decreased risk of cardiovascular disease, improved quality of life and type 1 diabetes (T1D) management. In order to individualise recommendaNons when implemented chronic exercise intervenNons, it seems important to beSer idenNfy the glycaemic excursions (hypo and hyperglycaemia) occurring the days including supervised exercise training sessions compared with the days without training. Whether these glycaemic profiles are changing throughout several months of training and whether differences appear according to the type of treatment (MDI or CSII) is also quesNonable. Method: FiWeen adults with T1D parNcipated to four-month combined (aerobic and strength) training program. Glycaemic excursion (i.e. glycaemic variability MAGE and CV, Nme spent in hypo- (<54 and <70 mg.dL-1 ), hyperglycaemia (>180 and >250 mg.dL-1 ) and normoglycemia were measured on both inacNvity and training days throughout the 4-month intervenNon. Results: Compared with training days, sedentary days led to a significant increase in Nme spent in severe hypoglycaemia (<54mg.dL-1 : e : +1,66 p<0,001; <70mg.dL-1 : e : +1,39 p<0,001) and hyperglycaemia (>250mg.dL-1 : e : +1.02 p<0.001). Concomitantly, MAGE was increased (e : +1,087 p<0,05). Moreover, as the weeks of training passed, independently of being on an ‘inacNve’ or a ‘training’ day, MAGE (e : -1,06 p<0,01) and Nme spent in hyperglycaemia (>180mg.dL-1 : e : -0,497, p<0,01 ; >250mg.dL-1 : e : -0,28 p<0,05) decreased and this more markedly in people living with insulin pump (>180mg.dL-1 : e : -1,267 p <0,05; MAGE : e : -2,23 p<0,05 vs. MDI). Conclusion: These results mays suggest that individuals with T1D are more afraid of hypoglycaemic risk the days with training vs. the inacNve days, thus controlling more their glycaemia and hence anNcipaNng extreme glycaemic excursions.