title: The influence of evaluation protocol on time spent exercising at a high level of oxygen uptake during continuous cycling.
abstract: OBJECTIVE
  This study evaluated the effects of protocol variation on the time spent exercising at ≥95% V̇O2max during cycle ergometer trials performed at the exercise intensity associated with V̇O2max (iV̇O2max).
  
  
  METHODS
  Nine male triathletes (age: 32±10 years; body mass: 73.3±6.1 kg; stature: 1.79±0.07 m; V̇O2max: 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 iV̇O2max (1 min) and iV̇O2max (3 min). During tests 3 and 4, participants performed a continuous bout of exhaustive cycling at iV̇O2max (1 min) (CONT1) and iV̇O2max (3 min) (CONT3).
  
  
  RESULTS
  iV̇O2max (1 min) was significantly greater (P<0.001) than iV̇O2max (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 V̇O2max was significantly longer (P=0.036) during CONT3 than CONT1 (146±158 s vs. 11±20 s), and time spent at ≥95% V̇O2max was significantly longer (P=0.005) during CONT3 than CONT1 (326±211 s vs. 57±51 s).
  
  
  CONCLUSIONS
  These results show that when exercising continuously at iV̇O2max, time spent at ≥95% V̇O2max is influenced by the initial measurement of iV̇O2max.
authors.affiliation: School of Science, University of Derby, Derby, UK - k.merry@derby.ac.uk.
authors.forename: K L
authors.initials: KL
authors.lastname: Merry
authors.forename: M
authors.initials: M
authors.lastname: Glaister
authors.forename: G
authors.initials: G
authors.lastname: Howatson
authors.forename: K
authors.initials: K
authors.lastname: Van Someren
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology; D016552:Ergometry; D005080:Exercise Test; D005221:Fatigue / Q000503:physiopathology; D006801:Humans; D008297:Male; D010100:Oxygen / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D013997:Time Factors
chemical_list: D010100:Oxygen