Background
Persons with type 2 diabetes were encouraged to undertake at least 150 min/week of moderate to vigorous aerobic exercise spread out during at least 3 days during the week, with no more than 2 consecutive days between bouts of aerobic activity. Sedentary behavior has emerged as a new risk factor for cardiovascular accident. The ADA (American diabetes association) recently announced updated, comprehensive guidelines for regular, structured physical exercise for everyone with diabetes and recommended less overall sedentary time every day. Sedentary behavior has emerged as a new risk factor for cardiovascular accident. Body fat is related with all-cause mortality.
Aim
The aim of this study was whether moderate to vigorous physical activity (MVPA) time or Sedentary time(ST) was related with percent body fat in type 2 diabetes.
Method
We randomly recruited seventy smart phone user with Type 2 diabetes and investigated sedentary(SPAt), light(LPAt), moderate(MPAt), vigorous physical activity time(VPAt) with wireless activity tracker (fitbit HR®:FB) for 7 days in free-living conditions. We also measured total muscle mass in kilograms(kg), total body fat (kg), and total body fat percentage(%) using body composition analyzer (Inbody®).
Results
Participants were as follows: female, 64.7%; age, 60.4±7.9 years; body mass index, 25.6±3.6kg·m2; duration of diabetes; 12.5±7.7 years; A1c;7.8±1.3%, Muscle; 42.2±7.6 kg, fat ; 20.3±7.1 kg, Percent fat ; 30.9±7.4%, recommended fat control -8.9±5.9 kg
SPAt was 933.9±219.7 minutes/day (73.4±9.9%), LPAt was 266.3±97.5 minutes/day (21.8±9.2%), MPAt was 25.9±25.9 minutes/day (2.1±2.1%), VPAt was 34.2±34.2 minutes/day (2.7±2.5%).
Percent fat was related with sedentary time (r=0.415, P=0.001), but not with MVPA time(r=-0.007, P=0.956) after adjusted for age, gender, and glycosylated hemoglobin level.
Similar results were found in 48 persons who had exercised more than 150 minutes of MVPA a week.Discussion
In conclusion, longer sedentary time was related with higher body fat in type 2 diabetes. These results supported the validity of the new recommendations about less sedentary time in type 2 diabetes mellitus from the American Diabetes Association in 2016.

Body fat was related with sedentary time, but not with moderate-vigorous physical activity time in type 2 diabetes