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Effects of frequency and duration of interrupting sitting on cardiometabolic risk markers

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posted on 06.08.2019 by Benjamin Maylor, Julia Zakrzewski-Fruer, David Stensel, Charlie Orton, Daniel Bailey
Introduction Interrupting prolonged sitting with multiple bouts of moderate-intensity physical activity (PA) can improve postprandial cardiometabolic risk markers. This study examined the effect of high and low frequency PA bouts (matched for total PA duration and energy expenditure) on postprandial cardiometabolic responses when compared with prolonged sitting. Methods In this three-condition randomised crossover trial, fourteen sedentary, inactive females (33.8±13.4 years, BMI 27.1±6.3 kg/m2 ) completed three, 7.5 h conditions: 1) prolonged sitting (SIT), 2) high-frequency PA breaks (HIGH-FREQ) consisting of 15 x 2 min bouts of moderate-intensity treadmill PA every 30 min, and 3) low-frequency PA breaks (LOW FREQ) consisting of 3 x 10 min bouts of moderate-intensity treadmill PA every 180 min. The PA bouts were performed at 65% of peak oxygen uptake. Net incremental area under the curve (iAUC) for each 7.5 h condition was calculated for glucose, insulin and triacylglycerol (TAG) concentrations. Results Insulin iAUC was significantly (p<0.026) lower during HIGH FREQ (mean [95%CI]; 82.86 [55.02, 110.70] µU/mL∙7.5h) than LOW-FREQ (116.61 [88.50, 144.73]) and SIT (119.98 [92.42, 147.53]). Glucose and TAG iAUC did not differ between conditions. Conclusions Engaging in higher-frequency PA breaks may be effective in attenuating postprandial insulin responses compared with lower-frequency PA breaks and prolonged sitting.

History

School

  • Sport, Exercise and Health Sciences

Published in

International Journal of Sports Medicine

Volume

40

Issue

13

Pages

818 - 824

Publisher

Thieme Publishing

Version

AM (Accepted Manuscript)

Rights holder

© GeorgThieme Publishing

Publisher statement

This paper was accepted for publication in the journal International Journal of Sports Medicine and the definitive published version is available at http://doi.org/10.1055/a-0997-6650

Acceptance date

23/07/2019

Publication date

2019-09-09

Copyright date

2019

ISSN

0172-4622

Language

en

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