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Standing is not enough: A randomized crossover study on the acute cardiometabolic effects of variations in sitting in healthy young men.

Authors
  • Altenburg, Teatske M1
  • Rotteveel, Joost2
  • Serné, Erik H3
  • Chinapaw, Mai J M4
  • 1 Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health research institute, The Netherlands. Electronic address: [email protected] , (Netherlands)
  • 2 Department of Pediatrics, Pediatric Endocrinology, Amsterdam University Medical Centers, The Netherlands. , (Netherlands)
  • 3 Department of Internal Medicine, Amsterdam University Medical Centers, The Netherlands. , (Netherlands)
  • 4 Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Public and Occupational Health, Amsterdam Public Health research institute, The Netherlands. , (Netherlands)
Type
Published Article
Journal
Journal of science and medicine in sport
Publication Date
Jul 01, 2019
Volume
22
Issue
7
Pages
790–796
Identifiers
DOI: 10.1016/j.jsams.2018.12.016
PMID: 30651222
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Standing desks and stability balls are increasingly popular to increase muscle activity and thereby prevent potential adverse cardiometabolic effects of prolonged sitting. The present study examined the effects of (1) sitting on a stability ball ('active sitting') and (2) hourly 10-min standing interruptions during prolonged sitting on postprandial cardiometabolic biomarkers. Experimental crossover study. Twenty healthy-weight males (19.2±0.6years) participated randomly in three 5-h conditions: (1) sitting on an office chair (SIT), (2) sitting on a stability ball (SIT-ACTIVE) and (3) sitting with hourly 10-min standing interruptions (SIT-STAND). In each condition, participants consumed a standardized mixed meal at baseline. Hourly blood samples and pre/post saliva samples were collected and analyzed for levels of insulin, glucose and cortisol. Pre/post hemodynamic monitoring (middle finger; Nexfin-monitoring) was conducted; heart rate was measured continuously (Polar) and muscle activity (leg and lower-back, Portilab) was measured during periods of sitting (on an office chair and on a stability ball) and standing. Muscle activity and heart rate during standing periods were significantly higher than during sitting (both SIT and SIT-ACTIVE). Generalized estimating equations revealed no significant difference in any of the biomarkers between the three experimental conditions. Systolic blood pressure was lower during SIT-STAND, while stroke volume was lower during SIT-ACTIVE than during SIT. Although significant, these differences were small, approximating the day-to-day variability in blood pressure and stroke volume. We conclude that hourly standing interruptions during 5h prolonged sitting or continuously sitting on a stability ball do not significantly affect postprandial cardiometabolic biomarkers in healthy young men. This trial is registered in the NTR trial register (NTRcode 5723). Copyright © 2019 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.

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