title: Exercise intensity and postprandial health outcomes in adolescents.
abstract: OBJECTIVE
  The effect of exercise intensity and sex on postprandial risk factors for cardiovascular disease in adolescents is unknown. We examined the effect of a single bout of work-matched high-intensity interval exercise (HIIE) and moderate-intensity exercise (MIE) on postprandial triacylglycerol (TAG) and systolic blood pressure (SBP) in adolescents.
  
  
  METHODS
  Twenty adolescents (10 male, 14.3 ± 0.3 years) completed three 1-day trials: (1) rest (CON); (2) 8 × 1 min cycling at 90 % peak power with 75 s recovery (HIIE); (3) cycling at 90 % of the gas exchange threshold (MIE), 1 h before consuming a high-fat milkshake (1.50 g fat and 80 kJ kg(-1)). Postprandial TAG, SBP and fat oxidation were assessed over 4 h
  
  
  RESULTS
  Compared to CON, the incremental area under the curve for TAG (IAUC-TAG) was not significantly lowered in HIIE [P = 0.22, effect size (ES) = 0.24] or MIE (P = 0.65, ES = 0.04) for boys. For girls, HIIE and MIE lowered IAUC-TAG by 34 % (P = 0.02, ES = 0.58) and 38 % (P = 0.09, ES = 0.73), respectively, with no difference between HIIE and MIE (P = 0.74, ES = 0.14). Changes in TAG were not related to energy expenditure during exercise or postprandial fat oxidation. Postprandial SBP (total-AUC pooled for both sexes) was lower in HIIE compared to CON (P = 0.01, ES = 0.68) and MIE (P = 0.02, ES = 0.60), with no difference between MIE and CON (P = 0.45, ES = 0.14).
  
  
  CONCLUSIONS
  A single bout of HIIE and MIE, performed 1 h before an HFM, can meaningfully attenuate IAUC-TAG in girls but not boys. Additionally, HIIE, but not MIE, may lower postprandial SBP in normotensive adolescents.
authors.affiliation: Children's Health and Exercise Research Centre, Sport and Health Science, College of Life and Environmental Sciences, University of Exeter, St Luke's Campus, Exeter, EX1 2LU, UK.
authors.forename: Bert
authors.initials: B
authors.lastname: Bond
authors.forename: Craig A
authors.initials: CA
authors.lastname: Williams
authors.forename: Carly
authors.initials: C
authors.lastname: Isic
authors.forename: Sarah R
authors.initials: SR
authors.lastname: Jackman
authors.forename: Keith
authors.initials: K
authors.lastname: Tolfrey
authors.forename: Laura A
authors.initials: LA
authors.lastname: Barrett
authors.forename: Alan R
authors.initials: AR
authors.lastname: Barker
mesh_terms: D000293:Adolescent; D001794:Blood Pressure / Q000502:physiology*; D002318:Cardiovascular Diseases / Q000209:etiology* / Q000503:physiopathology; D004734:Energy Metabolism / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D019518:Postprandial Period / Q000502:physiology*; D012146:Rest / Q000502:physiology; D012307:Risk Factors; D012737:Sex Factors; D014280:Triglycerides / Q000097:blood*
chemical_list: D014280:Triglycerides