title: Acute high-intensity interval running reduces postprandial lipemia in boys.
abstract: BACKGROUND
  Acute moderate-intensity exercise reduces postprandial lipemia in boys. However, the effect of high-intensity exercise has not been investigated. This study examined the effect of low-volume, high-intensity interval running (HIIR) on postprandial plasma triacylglycerol (TAG) concentrations.
  
  
  METHODS
  Fifteen healthy, active boys (means ± SD; age = 11.8 ± 0.4 yr, body mass = 42.8 ± 8.0 kg, peak oxygen uptake [VO2] = 55 ± 6 mL · kg(-1) · min(-1)) completed two 2-d trials in a counterbalanced, crossover design separated by 14 d. On day 1, participants rested (CON) or completed 10 × 1 min running intervals at 100% maximal aerobic speed, determined from an incremental peak VO2 test, with 1 min recovery between intervals (HIIR). On day 2, capillary blood samples were taken in the fasted state and at predetermined intervals throughout the 6.5-h postprandial period while participants rested. A standardized breakfast was consumed at 0800 h, immediately after the fasting sample, and a standardized lunch meal was consumed at 1200 h.
  
  
  RESULTS
  Differences in fasting plasma TAG concentration were small to moderate (95% confidence interval [CI] = -0.11 to 0.01, effect size [ES] = 0.40). Postprandial TAG concentration was lower during HIIR compared with CON (95% CI = -0.19 to -0.02, ES = 0.58). The total area under the TAG concentration versus time curve was lower after HIIR compared with CON (5.2 ± 1.1 vs 5.8 ± 1.5 mmol(-1) · L 6.5 h; 95% CI = -1.18 to -0.12, ES = 0.50).
  
  
  CONCLUSIONS
  This is the first study to show that low-volume HIIR attenuates postprandial TAG concentration in healthy, active 11- to 12-yr-old boys.
authors.affiliation: School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom.
authors.forename: Alice E
authors.initials: AE
authors.lastname: Thackray
authors.forename: Laura A
authors.initials: LA
authors.lastname: Barrett
authors.forename: Keith
authors.initials: K
authors.lastname: Tolfrey
mesh_terms: D000704:Analysis of Variance; D015415:Biomarkers / Q000097:blood; D062408:Breakfast; D002648:Child; D018592:Cross-Over Studies; D005080:Exercise Test; D064368:Healthy Volunteers; D006801:Humans; D015228:Hypertriglyceridemia / Q000097:blood / Q000209:etiology / Q000517:prevention & control*; D062409:Lunch; D008297:Male; D019518:Postprandial Period / Q000502:physiology*; D012420:Running / Q000502:physiology*; D014280:Triglycerides / Q000097:blood*
chemical_list: D015415:Biomarkers; D014280:Triglycerides