Breaking Up Prolonged Sitting with Light-intensity Walking Attenuated Postprandial Hyperglycemia
AbstractSedentary behaviour is a risk factor for comorbidities and mortality regardless of physicalactivity level. Experimental data show interrupting prolonged sitting is beneficially associatedwith metabolic risk. This study therefore investigated the acute effects of interruptingprolonged sitting with light-intensity walking on postprandial hyperglycemia in healthy adults.This study involved thirty normoglycemic participants. Each of the study participants weregiven a standard 75-grams glucose. The treatment of the participants was divided into twotrials. First, the control trial, the participants were instructed to sit for five straight hours. Theprofile of changes in blood glucose was taken at an inverval of 30 minutes from minutes 0, 30,90, 120, 180, 240, and 300. Second, the experimental trial where the participants wereinstructed to take a short walk for 3 minutes then sit for 27 minutes. Data were analyzed usingpaired T-test. There were no significant data difference at the baseline between trials. Therewere no significant changes in all the point of blood glucose recordings except at 120 minutes,where the postprandial blood glucose of the experimental trial with light-intensity walking wassignificantly lower than that of control trial. The main finding of this study was that breakingup sitting time with short bouts of light-intensity activity attenuated postprandialhyperglycemia. The light-intensity walking attenuated the postprandial hyperglycemia albeitnot significant statistically except at the 120 minutes time point. Postprandial hyperglycemiais a cardiovascular risk factor in people with Type 2 diabetes and even in nondiabetics.Reducing postprandial hyperglycemia improves inflammation and endothelial function andreduces carotid intima-media thickness. Frequent brief interruptions to prolonged sitting withlight-intensity walking, impart beneficial postprandial responses. Further study isrecommended on more prolonged light-intensity bouts of activity and shorter period of sitting.
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