Breaking Sedentary Time with Exercise Bouts on Metabolism
Yoichi Hatamoto Nutrition, Metabolism and Cardiovascular Diseases Articles in Press E-mail Alert - April 6, 2021
Background and Aims
Breaking up sedentary periods, especially with light activity, increases total energy expenditure (EE) and helps provide better glycemic control. However, the effects of activities of various intensities to interrupt prolonged sedentary time are unclear. The purpose of the present study was to examine potential differences in glycemic control and EE from breaking up sedentary time with short exercise bouts of different intensities.
Methods and Results
Nine overweight/obesity young men underwent whole-body indirect calorimetry at 19:00 on day 1 and stayed overnight. After awakening on day 2, they performed short-duration jogging every 30 minutes over 8 hours (16 times bouts in total) under 3 conditions with the same running distance: (1) lactate threshold (LT) for 2 min; (2) 60% lactate threshold (60% LT) for 200 s; and (3) onset of blood lactate accumulation (OBLA) for 75 s. The 24h-EE and interstitial glucose concentration (from 8:00-19:00 on day 2) was continuously measured throughout the trials. The standard deviation during intervention and indexes of postprandial of the interstitial glucose concentration was significantly lower at LT and OBLA than 60% LT (p<0.05). The 24-h EE was not significantly different among conditions, but EE at OBLA during intervention was slightly but significantly higher than at 60% LT and LT.
Conclusion
Breaking up sedentary time with short-duration jogging at LT and OBLA intensities may have better glycemic control and increase use of carbohydrate as a fuel, while short-duration exercise at OBLA intensity may increase energy expenditure.