Breaking Sitting Time with Physical Activity Increases Energy Expenditure but Does Not Alter Postprandial Metabolism in Girls
Smallcombe, James, Biddle, Gregory, Slater, Tommy, Thackray, Alice, Dunstan, David Wayne, Barrett, Laura and Tolfrey, Keith. (2022). Breaking Sitting Time with Physical Activity Increases Energy Expenditure but Does Not Alter Postprandial Metabolism in Girls. Medicine and Science in Sports and Exercise. 54(11), pp. 1850-1860. https://doi.org/10.1249/MSS.0000000000002979
|Authors||Smallcombe, James, Biddle, Gregory, Slater, Tommy, Thackray, Alice, Dunstan, David Wayne, Barrett, Laura and Tolfrey, Keith|
Purpose: Young people spend a substantial proportion of their time at school sedentary; therefore, this setting represents an important target for interventions aimed at displacing sedentary time with physical activity. This study aimed to examine the postprandial metabolic effects of breaking sedentary time by accumulating walking and repeated bouts of nonambulatory standing during simulated school days in inactive adolescent girls.
Methods: Seventeen girls (mean ± SD = 12.8 ± 0.4 yr) completed two 3-d experimental conditions. On days 1 and 2 of the standing + walking (STD-WLK) experimental trial, participants interrupted sedentary time by completing 4 × 10 min bouts of self-paced walking and accumulated 18 × 5 min standing bouts during each simulated school day. On day 3 of STD-WLK, participants attended school as normal with no additional physical activity or standing prescribed. On all 3 d of the control condition (CON), participants attended school as normal with no physical activity intervention. On days 2 and 3 of both STD-WLK and CON, a baseline capillary blood sample was provided to determine fasting [TAG] and [glucose]. Participants then consumed a standardized breakfast (0 h) and lunch (4.7 h), and blood samples were provided postprandially at 2.7, 5.3, and 7.3 h for [TAG] and [glucose].
Results: Energy expenditure was 28% (95% confidence interval = 8% to 52%) higher during school hours on day 1 and day 2 during STD-WLK compared with CON (2171 vs 1693 kJ; effect size = 0.89, P = 0.008). However, no reduction of fasting or postprandial [TAG] or [glucose] was observed on day 2 or day 3 (P ≥ 0.245).
Conclusions: Two consecutive days of breaking prolonged sitting with self-paced walking and intermittent standing had no meaningful effect on postprandial metabolism in adolescent girls.
|Keywords||SCHOOL; METABOLIC HEALTH; LIPEMIA; GLYCEMIA; TRIACYLGLYCEROL; SEDENTARY|
|Year||01 Jan 2022|
|Journal||Medicine and Science in Sports and Exercise|
|Journal citation||54 (11), pp. 1850-1860|
|Publisher||Lippincott Williams & Wilkins|
|Digital Object Identifier (DOI)||https://doi.org/10.1249/MSS.0000000000002979|
|Web address (URL)||https://journals.lww.com/acsm-msse/Fulltext/2022/11000/Breaking_Sitting_Time_with_Physical_Activity.6.aspx|
|Open access||Published as non-open access|
|Research or scholarly||Research|
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|Publication process dates|
|Accepted||01 Jun 2022|
|Deposited||04 Jan 2023|
This is a non-final version of an article published in final form in Medicine & Science in Sports & Exercise 54(11):p 1850-1860, November 2022. | DOI: 10.1249/MSS.0000000000002979.
|Place of publication||United States|
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