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

Authors

  • Duncan S. Buchan,

    Corresponding author
    1. Health and Exercise Sciences, School of Science, University of the West of Scotland, Hamilton, ML3 0JB, Scotland, United Kingdom
    • Health and Exercise Sciences, School of Science, University of the West of Scotland, Hamilton, ML3 0JB, Scotland, United Kingdom
    Search for more papers by this author
  • Stewart Ollis,

    1. Health and Exercise Sciences, School of Science, University of the West of Scotland, Hamilton, ML3 0JB, Scotland, United Kingdom
    Search for more papers by this author
  • John D. Young,

    1. Life and Environment, School of Science, University of the West of Scotland, Hamilton, ML3 0JB, Scotland, United Kingdom
    Search for more papers by this author
  • Non E. Thomas,

    1. Centre for Children and Young People's Health and Well-Being, School of Human and Health Sciences, Swansea University, Swansea, SA2 8PP, Wales, United Kingdom
    Search for more papers by this author
  • Stephen-Mark Cooper,

    1. Cardiff School of Sport, UWIC, Cyncoed Campus, Cyncoed Road, Cardiff, CF23 6XD, Wales, United Kingdom
    Search for more papers by this author
  • Tom K. Tong,

    1. Dr. Stephen Hui Research Centre for Physical Recreation and Wellness, Hong Kong Baptist University, Hong Kong, NAB210, China
    Search for more papers by this author
  • Jinlei Nie,

    1. School of Physical Education and Sports, Macao Polytechnic Institute, Rua de Luis Gonzaga Gomes, Macao, China
    Search for more papers by this author
  • Robert M. Malina,

    1. Department of Kinesiology and Health Education, The University of Texas at Austin, 1 University Station-D3700, Austin, Texas
    Search for more papers by this author
  • Julien S Baker

    1. Health and Exercise Sciences, School of Science and Technology, University of the West of Scotland, Hamilton, ML3 0JB, Scotland, United Kingdom
    Search for more papers by this author

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 (VO2max).

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. Am. J. Hum. Biol., 2011. © 2011 Wiley-Liss, Inc.

Ancillary