Small-sided Soccer in School Reduces Postprandial Lipaemia in Adolescent Boys

Purpose While laboratory based moderate- to high-intensity exercise reduces postprandial lipaemia in adolescents this exercise differs to the free-living physical activities in which young people typically engage. This study compared the effect of free-living afterschool soccer activity and treadmill exercise on in-school postprandial lipaemia in adolescent boys. Methods Fifteen boys (12.6 (0.5) years) completed three, 2-day experimental trials. On Day 1, participants either: rested (CON); exercised for 48 min on a treadmill at 60% peak V[Combining Dot Above]O2 (TM); played 48 min of 5-a-side soccer (SOC). On Day 2, participants attended school where a capillary blood sample determined fasting triacylglycerol ([TAG]) and glucose ([glucose]) concentrations. Participants then consumed a standardised breakfast (0 h) and lunch (4.5 h) and blood samples were taken postprandially at 2.5, 5.0 and 7.0 h. Results Reductions in fasting [TAG] were small-moderate after TM (-16%, 95% CI = -27 to -2%, ES = 0.46), but large after SOC (-30%, 95% CI = -40 to -20%, ES = 1.00) compared with CON; the concentration was also lower in SOC compared with TM (-18%, 95% CI = -29 to -5%, ES = 0.53). Based on ratios of geometric means, the area under the TAG versus time curve was 18% lower after TM (95% CI = -29 to -5%, ES = 0.51) and 25% lower after SOC (95% CI = -35 to -13%, ES = 0.76,) compared with CON. In contrast, SOC and TM were not significantly different (-9%, 95% CI = -21 to 5%, ES = 0.25). Conclusion Compared with duration-matched inactivity (CON), after-school small sided soccer (SOC) and treadmill exercise (TM) resulted in a similar, moderate reduction of postprandial lipaemia in adolescent boys. Corresponding author: Dr Keith Tolfrey, Loughborough University, School of Sport Exercise and Health Sciences, Epinal Way, Loughborough, LE11 3TU. k.tolfrey@lboro.ac.uk, +44 (0)1509 226355 The authors acknowledge the support of the North American Society for Pediatric Exercise Medicine (NASPEM) and their awarding of the Marco Cabrera Student Research Award to support this research. This research was supported by the National Institute for Health Research (NIHR) Leicester Biomedical Research Centre. The views expressed are those of the authors and not necessarily those of the NHS, the NIHR or the Department of Health. The authors declare no conflict of interest. The results of the present study do not constitute endorsement by ACSM. The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. Accepted for Publication: 16 June 2018 © 2018 American College of Sports Medicine

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