MSSE E-pub sprint PPL paper Aug 2019.pdf (2.37 MB)

Short sprints accumulated at school modulate postprandial metabolism in boys

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posted on 19.08.2019, 09:21 by James Smallcombe, Laura BarrettLaura Barrett, Lauren SherarLauren Sherar, Matthew J Sedgwick, Tommy Slater, Keith TolfreyKeith Tolfrey
INTRODUCTION: This study examined the efficacy of maximal sprint running accumulated during a typical school day to modulate postprandial metabolism in adolescent boys. METHODS: Nineteen adolescent boys completed three, 2-day experimental conditions; a standard-practice control (CON); accumulated in-school sprint running (ACC); and a single block of afterschool sprint running (BLO). On Day 1, a fasting capillary blood sample was taken at 07:35 in the school. Three subsequent postprandial blood samples were taken at predetermined times after consumption of standardised breakfast and lunch. During ACC, participants accumulated four sets of 10 × 30 m maximal-intensity sprint runs across natural breaks in lessons. During BLO, participants performed the same number of sprints (forty) in a single after-school exercise session. The blood samples from Day 1 were replicated on the day after exercise (Day 2). RESULTS: On Day 1, no significant differences in total area under the plasma triacylglycerol concentration versus time curve (TAUC-TAG) were observed between conditions (P = 0.126). However, TAUC-insulin was lower in ACC compared with BLO (-26%, ES = 0.86, P = 0.001) and CON (-22%, ES = 0.72, P = 0.010). On Day 2, TAUC-TAG was 12% lower after ACC (ES = 0.49; P = 0.002) and 10% lower after BLO (ES = 0.37; P = 0.019) compared with CON. No significant differences were observed between conditions on Day 2 for postprandial insulin or glucose (P ≥ 0.738). CONCLUSION: Four sets of 10 × 30 m sprints, accumulated in four separate bouts (<5 min) during the school day reduced postprandial triacylglycerol and insulin concentrations in adolescent boys and may represent an effective in-school exercise strategy to promote metabolic health.

History

School

  • Design
  • Sport, Exercise and Health Sciences

Published in

Medicine and Science in Sports and Exercise

Volume

52

Issue

1

Pages

67–76

Publisher

Lippincott, Williams & Wilkins

Version

AM (Accepted Manuscript)

Rights holder

© American College of Sports Medicine

Publisher statement

This is a non-final version of an article published in final form in Smallcombe, J.W. ... et al., 2019. Short sprints accumulated at school modulate postprandial metabolism in boys. Medicine and Science in Sports and Exercise, 52(1):67–76, http://doi.org/10.1249/MSS.0000000000002121.

Acceptance date

02/08/2019

Publication date

2019-08-07

Copyright date

2019

ISSN

0195-9131

eISSN

1530-0315

Language

en

Depositor

Dr Keith Tolfrey

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