Assessment of sedentary behaviors in children and adolescents with type 1 diabetes (T1D), relative to the method of insulin therapy used, and in comparison to healthy controls.The study group consisted of 215 children with T1D, including 109 (50.7%) insulin pen and 106 (49.3%) insulqsain pump users. The control group comprised 115 healthy children. The subjects' sedentary time was measured with a tri-axial accelerometer ActiGraph GT3X+, used continuously for 7 days.The diabetes group was characterized by a significantly higher "% in sedentary time" score (P = .024) and a lower "mean daily breaks in sedentary time" result (P = .007), which means that they spent much more time on sedentary activities compared to the control group. There were no significant differences between the children using insulin pump and insulin pen in the "% in sedentary time" score (P = .294) and "mean daily breaks in sedentary time" (P = .251).The T1D is a serious encumbrance, leading to longer duration of sedentary time, in comparison to healthy controls. The type of insulin therapy did not significantly affect the percentage of the wear-day spent in sedentary time and mean daily breaks in sedentary time.