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Contribution of central and peripheral adaptations to changes in VO2max following four weeks of sprint interval training James P. Raleigh1, Matthew D. Giles1, Hashim Islam1, Matthew Nelms1, Robert F. Bentley1, Joshua H. Jones2, J. Alberto Neder2, Kristen Boonstra3, Joe Quadrilatero3, Craig A. Simpson1, Michael E. Tschakovsky1, and Brendon J. Gurd1 1
School of Kinesiology and Health Studies Queen’s University, Kingston, Ontario, Canada K7L 3N6 2
Department of Medicine, Division of Respirology Queen’s University, Kingston, Ontario, Canada K7L 3N6 3
Department of Kinesiology University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Corresponding Author: Brendon J. Gurd, PhD Telephone: 613-533-6000 x79023 Fax: 613-533-6000 Email:
[email protected]
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Abstract The current study examined the contribution of central and peripheral adaptations to changes in maximal oxygen uptake (VO2max) following sprint interval training (SIT). Twentythree males completed four weekly SIT sessions (8 x 20 second cycling bouts at ~170% of work rate at VO2max, 10 second recovery) for four weeks. Following completion of training, the relationship between changes in VO2max and changes in central (cardiac output) and peripheral (a-vO2diff, muscle capillary density, oxidative capacity, fibre-type distribution) adaptations was determined in all participants using correlation analysis. Participants were then divided in to tertiles based on the magnitude of their individual VO2max responses and differences in central/peripheral adaptations were examined in the top (HI; ~10 mL/kg/min increase in VO2max, p0.05) tertiles (n=8 each). Training had no impact on Qmax and no differences were observed between the LO and HI groups (p>0.05).
A-vO2diff increased in the HI group only (p
