Contribution of central and peripheral adaptations to changes in maximal oxygen uptake following 4 weeks of sprint interval training
| Autor: | Joe Quadrilatero, Hashim Islam, J. Alberto Neder, Michael E. Tschakovsky, Craig A. Simpson, Brendon J. Gurd, Joshua H. Jones, James P. Raleigh, Matthew D. Giles, Matthew W. Nelms, Robert F. Bentley, Kristen Boonstra |
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| Rok vydání: | 2018 |
| Předmět: |
Male
medicine.medical_specialty Time Factors Physiology Endocrinology Diabetes and Metabolism High-Intensity Interval Training Interval training Quadriceps Muscle Young Adult 03 medical and health sciences Oxygen Consumption 0302 clinical medicine Physiology (medical) Internal medicine Humans Medicine Cardiac Output Exercise Nutrition and Dietetics business.industry VO2 max 030229 sport sciences General Medicine Adaptation Physiological Bicycling Capillaries Peripheral Oxygen Sprint Cardiology Energy Metabolism business 030217 neurology & neurosurgery Muscle Contraction |
| Zdroj: | Applied Physiology, Nutrition, and Metabolism. 43:1059-1068 |
| ISSN: | 1715-5320 1715-5312 |
| DOI: | 10.1139/apnm-2017-0864 |
| Popis: | The current study examined the contribution of central and peripheral adaptations to changes in maximal oxygen uptake (V̇O2max) following sprint interval training (SIT). Twenty-three males completed 4 weekly SIT sessions (8 × 20-s cycling bouts at ∼170% of work rate at V̇O2max, 10-s recovery) for 4 weeks. Following completion of training, the relationship between changes in V̇O2max and changes in central (cardiac output) and peripheral (arterial–mixed venous oxygen difference (a-vO2diff), muscle capillary density, oxidative capacity, fibre-type distribution) adaptations was determined in all participants using correlation analysis. Participants were then divided into tertiles on the basis of the magnitude of their individual V̇O2max responses, and differences in central and peripheral adaptations were examined in the top (HI; ∼10 mL·kg−1·min−1 increase in V̇O2max, p < 0.05) and bottom (LO; no change in V̇O2max, p > 0.05) tertiles (n = 8 each). Training had no impact on maximal cardiac output, and no differences were observed between the LO group and the HI group (p > 0.05). The a-vO2diff increased in the HI group only (p < 0.05) and correlated significantly (r = 0.71, p < 0.01) with changes in V̇O2max across all participants. Muscle capillary density (p < 0.02) and β-hydroxyacyl-CoA dehydrogenase maximal activity (p < 0.05) increased in both groups, with no between-group differences (p > 0.05). Citrate synthase maximal activity (p < 0.01) and type IIA fibre composition (p < 0.05) increased in the LO group only. Collectively, although the heterogeneity in the observed V̇O2max response following 4 weeks of SIT appears to be attributable to individual differences in systemic vascular and/or muscular adaptations, the markers examined in the current study were unable to explain the divergent V̇O2max responses in the LO and HI groups. |
| Databáze: | OpenAIRE |
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