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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
EXERCISE PHYSIOLOGY AND BIOMECHANICS
Merry K. L. 1, Glaister M. 2, Howatson G. 3, 4, Van Someren K. 5
1 School of Science, University of Derby, Derby, UK;
2 School of Sport, Health and Applied Science, St Mary’s University, Twickenham, UK;
3 Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon -Tyne, UK;
4 Water Research Group, School of Environmental Sciences and Development, Northwest University, Potchefstroom, South Africa;
5 GlaxoSmithKline Human Performance Laboratory, Brentford, UK
AIM: This study evaluated the effects of protocol variation on the time spent exercising at ≥95% .VO2max during cycle ergometer trials performed at the exercise intensity associated with .VO2max (i .VO2max).
METHODS: Nine male triathletes (age: 32±10 years; body mass: 73.3±6.1 kg; stature: 1.79±0.07 m; .VO2max: 3.58±0.45 L.min-1) performed four exercise tests. During tests 1 and 2, participants performed a maximal incremental cycle ergometer test using different stage durations (1 min and 3 min) for the determination of i .VO2max (1 min) and i .VO2max (3 min). During tests 3 and 4, participants performed a continuous bout of exhaustive cycling at i .VO2max (1 min) (CONT1) and i .VO2max (3 min) (CONT3).
RESULTS: i .VO2max (1 min) was significantly greater (P<0.001) than i .VO2max (3 min) (340±31 W vs. 299±44 W). Time to exhaustion (TTE) measured during CONT3 was significantly longer (P<0.001) than CONT1 (529±140 s vs. 214±65 s). Time spent at .VO2max was significantly longer (P=0.036) during CONT3 than CONT1 (146±158 s vs. 11±20 s), and time spent at ≥95% .VO2max was significantly longer (P=0.005) during CONT3 than CONT1 (326±211 s vs. 57±51 s).
CONCLUSION: These results show that when exercising continuously at i .VO2max, time spent at ≥95% .VO2max is influenced by the initial measurement of i .VO2max.