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Breaking Sitting Time with Physical Activity Increases Energy Expenditure but Does Not Alter Postprandial Metabolism in Girls
journal contribution
posted on 2023-02-10, 04:52 authored by JW Smallcombe, GJH Biddle, T Slater, AE Thackray, David DunstanDavid Dunstan, LA Barrett, K TolfreyPurpose 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.
History
Journal
Medicine and Science in Sports and ExerciseVolume
54Pagination
1850-1860Location
United StatesPublisher DOI
ISSN
0195-9131eISSN
1530-0315Language
enPublication classification
C1.1 Refereed article in a scholarly journalIssue
11Publisher
Ovid Technologies (Wolters Kluwer Health)Usage metrics
Categories
Keywords
AdolescentBlood GlucoseCross-Over StudiesEnergy MetabolismFemaleHumansInsulinPostprandial PeriodSexually Transmitted DiseasesTriglyceridesWalkingPediatricClinical ResearchMetabolic and endocrineHuman Movement and Sports Science not elsewhere classifiedPublic Health and Health Services not elsewhere classifiedMedical Physiology not elsewhere classified
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