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Postprandial triacylglycerol in adolescent boys: a case for moderate exercise

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journal contribution
posted on 03.07.2014, 14:37 by Keith TolfreyKeith Tolfrey, Alex Doggett, Craig Boyd, Susan Pinner, Adam Sharples, Laura BarrettLaura Barrett
Purpose: To compare the effects of 60-min bouts of intermittent moderate and vigorous exercise on postprandial plasma triacylglycerol (TAG) metabolism in eight healthy adolescent boys (mean ± SD age: 13 ± 0.3 yr). Methods: Participants completed three conditions in a counterbalanced order. On day 1, they either rested for 110 min (CON), completed 6 × 10-min blocks of intermittent treadmill exercise at 53% peak V·O2 (MOD), or 6 × 10-min blocks at 75% peak V·O2 (VIG). On day 2 after a 12-h fast, a capillary blood sample was taken for [TAG] and [glucose] (mmol·L-1) and then a high-fat milkshake was consumed (1.50 g·kg-1 fat, 1.22 g·kg-1 CHO, and 0.22 g·kg-1 protein; 80 kJ·kg-1). Further blood samples were taken every hour for a 6-h postprandial rest period for [TAG] and [glucose]. Results: Estimated energy expenditure was 45% higher in VIG than in MOD (95% confidence interval [CI] 23-72%). Fasting [TAG] and [glucose] did not differ between the conditions. Average [TAG] for the postprandial period was lower by 24% in MOD (95% CI -47% to 9%, P = 0.06) and by 21% in VIG (95% CI -42% to 8%, P = 0.08) than CON, with no meaningful difference (4%; 95% CI -27% to 48%, P = 0.50) between MOD and VIG. The total area under the [TAG] versus time curve (mmol·L-1 6 h) was lower by 24% in MOD (95% CI -42% to 0%, P = 0.05) and by 20% in VIG (95% CI -37% to 0%, P = 0.07) than CON. MOD and VIG were not different from each other (4%; 95% CI -18% to 32%, P = 0.54). Conclusion: Both 60 min of moderate and vigorous intermittent exercises reduced postprandial [TAG]. However, the extra energy expended in the vigorous condition did not produce a dose-related reduction compared with the moderate-intensity condition.

History

School

  • Sport, Exercise and Health Sciences

Published in

MEDICINE AND SCIENCE IN SPORTS AND EXERCISE

Volume

40

Issue

6

Pages

1049 - 1057 (9)

Citation

TOLFREY, K. ... et al, 2008. Postprandial triacylglycerol in adolescent boys: a case for moderate exercise. Medicine and Science in Sports and Exercise, 40 (6), pp. 1049 - 1057.

Publisher

Lippincott, Williams and Wilkins / © American College of Sports Medicine

Version

AM (Accepted Manuscript)

Publication date

2008

Notes

This is a non-final version of an article published in final form in Medicine and Science in Sports and Exercise, 40 (6), pp. 1049 - 1057.

ISSN

0195-9131

Language

en

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