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Am J Hum Biol. 2011 Jul-Aug;23(4):517-26. doi: 10.1002/ajhb.21166. Epub 2011 Apr 4.

The effects of time and intensity of exercise on novel and established markers of CVD in adolescent youth.

Author information

  • 1Health and Exercise Sciences, School of Science, University of the West of Scotland, Hamilton, United Kingdom. duncan.buchan@uws.ac.uk

Abstract

OBJECTIVES:

This article examines the effects of brief, intense exercise in comparison with traditional endurance exercise on both novel and traditional markers of cardiovascular disease (CVD) in youth.

METHODS:

Forty seven boys and ten girls (16.4 ± 0.7 years of age) were divided into a moderate (MOD), high intensity (HIT), or a control group. The MOD group (12 boys, 4 girls) and HIT group (15 boys, 2 girls) performed three weekly exercise sessions over 7 weeks. Each session consisted of either four to six repeats of maximal sprint running within a 20 m area with 20-30 s recovery (HIT) or 20 min continuous running within a 20 m area at ∼70% maximal oxygen uptake (VO(2) max).

RESULTS:

Total exercise time commitment over the intervention was 420 min (MOD) and 63 min (HIT). Training volume was 85% lower for the HIT group. Total estimated energy expenditure was ∼907.2 kcal (HIT) and ∼4410 kcal (MOD). Significant improvements (P ≤ 0.05) were found in systolic blood pressure, aerobic fitness, and body mass index (BMI) postintervention (HIT). In the MOD group, significant (P ≤ 0.05) improvements were noted in aerobic fitness, percentage body fat (%BF), BMI, fibrinogen (Fg), plasminogen activator inhibitor-1, and insulin concentrations.

CONCLUSIONS:

These findings demonstrate that brief, intense exercise is a time efficient means for improving CVD risk factors in adolescents.

Copyright © 2011 Wiley-Liss, Inc.

PMID:
21465614
[PubMed - indexed for MEDLINE]
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