Publications

Acute Compensatory Responses to Interrupting Prolonged Sitting with Intermittent Activity in Preadolescent Children

PURPOSE:The purpose of this study was to compare the effects of intermittent activity performed at varying intesnities and prolonged sitting on physical activity compensation. METHODS:Thirty-three children (14 boys, 19 girls; ages 7-11 years; 24% overweight/obese; 61% non-white) completed four experimental conditions in random order: 8 hours of sitting interrupted with 20, 2-minute low-, moderate-, or high-intensity activity breaks or 20, 2-minute sedentary computer-game breaks. Physical activity energy expenditure (PAEE) was assessed via accelerometry to establish baseline PAEE and throughout each condition day (8 hours in-lab PAEE, out-of-lab PAEE, and 3 days post-condition). RESULTS:Compared to baseline PAEE, total daily PAEE was significantly higher during the high-intensity condition day (153±43 kcals, p=0.03), unchanged during the low-intensity (-40±23 kcals, p>0.05) and moderate-intensity condition days (-11±18 kcals, p>0.05), and decreased in response to prolonged sitting (-79±22 kcals, p=0.03). There were no significant differences in PAEE 3 days post-condition across conditions (p>0.05). CONCLUSION:Despite the varying levels of PAEE accumulated during the 8-hour laboratory conditions, out-of-lab PAEE during each condition day and 3 days post-condition did not change from baseline. These findings provide preliminary evidence that spontaneous physical activity in children do not change in response to intermittent activity or prolonged sitting.; PURPOSE:The purpose of this study was to compare the effects of intermittent activity performed at varying intesnities and prolonged sitting on physical activity compensation. METHODS:Thirty-three children (14 boys, 19 girls; ages 7-11 years; 24% overweight/obese; 61% non-white) completed four experimental conditions in random order: 8 hours of sitting interrupted with 20, 2-minute low-, moderate-, or high-intensity activity breaks or 20, 2-minute sedentary computer-game breaks. Physical activity energy expenditure (PAEE) was assessed via accelerometry to establish baseline PAEE and throughout each condition day (8 hours in-lab PAEE, out-of-lab PAEE, and 3 days post-condition). RESULTS:Compared to baseline PAEE, total daily PAEE was significantly higher during the high-intensity condition day (153±43 kcals, p=0.03), unchanged during the low-intensity (-40±23 kcals, p>0.05) and moderate-intensity condition days (-11±18 kcals, p>0.05), and decreased in response to prolonged sitting (-79±22 kcals, p=0.03). There were no significant differences in PAEE 3 days post-condition across conditions (p>0.05). CONCLUSION:Despite the varying levels of PAEE accumulated during the 8-hour laboratory conditions, out-of-lab PAEE during each condition day and 3 days post-condition did not change from baseline. These findings provide preliminary evidence that spontaneous physical activity in children do not change in response to intermittent activity or prolonged sitting.