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Two weeks of reduced-volume sprint interval or traditional exercise training does not improve metabolic functioning in sedentary obese men

Authors

  • J. R. Skleryk,

    Corresponding author
    1. School of Exercise and Health Sciences, Edith Cowan University, Perth, Western Australia
    • Correspondence to: Julia R. Skleryk, High Performance Sport New Zealand, PO Box 302 563, North Harbour, Auckland 0751, New Zealand.

      E-mail: julia.skleryk@hpsnz.org.nz

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  • L. G. Karagounis,

    1. Exercise and Nutrition Research Group, School of Medical Sciences, RMIT University, Melbourne, Victoria, Australia
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  • J. A. Hawley,

    1. Exercise and Nutrition Research Group, School of Medical Sciences, RMIT University, Melbourne, Victoria, Australia
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  • M. J. Sharman,

    1. School of Exercise and Health Sciences, Edith Cowan University, Perth, Western Australia
    2. School of Human Life Sciences, University of Tasmania, Launceston, Tasmania
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  • P. B. Laursen,

    1. School of Exercise and Health Sciences, Edith Cowan University, Perth, Western Australia
    2. High Performance Sport New Zealand, Auckland, New Zealand
    3. Sport Performance Research Institute New Zealand (SPRINZ), School of Sport and Recreation, Auckland University of Technology, Auckland, New Zealand
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  • G. Watson

    1. School of Exercise and Health Sciences, Edith Cowan University, Perth, Western Australia
    2. School of Human Life Sciences, University of Tasmania, Launceston, Tasmania
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Abstract

Aims

To investigate the effects of short-term, reduced-volume sprint interval training (SIT) compared to traditional exercise recommendations (TER) in sedentary obese men.

Methods

Sixteen subjects [37.8 ± 5.8 years; body mass index (BMI) 32.8 ± 4.7 kg/m2] were randomly allocated to 2 weeks of either SIT (6 sessions of 8–12 × 10 s sprints) or TER [10 sessions of 30 min at 65% peak oxygen consumption (VO2peak)] cycle exercise. Fasting plasma glucose, insulin, non-esterified fatty acids (NEFA), homeostasis model assessment of insulin sensitivity (HOMA–IR), body composition and VO2peak were assessed at baseline and approximately 72 h after the final training bout. Skeletal muscle biopsy samples were also obtained before and 72 h after training and analysed for AS160 phosphorylation and COX II, COX IV, GLUT-4, Nur77 and SIRT1 protein expression.

Results

No changes in BMI, body composition, VO2peak, glucose, insulin, NEFA and HOMA–IR were observed after training, either within or between groups. Skeletal muscle markers of glucose metabolism and mitochondrial function also remained unaltered after 2 weeks of exercise training.

Conclusions

Our findings show that 2 weeks of reduced-volume SIT or TER did not elicit any measurable metabolic adaptations in sedentary obese men. Further work is needed to determine the minimal amount of exercise required for short-term adaptations in this population.

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