title: The effect of prior exercise intensity on oxygen uptake kinetics during high-intensity running exercise in trained subjects.
abstract: OBJECTIVE
  The aim of this study was to compare the effects of two different kinds of prior exercise protocols [continuous exercise (CE) versus intermittent repeated sprint (IRS)] on oxygen uptake (VO2) kinetics parameters during high-intensity running.
  
  
  METHODS
  Thirteen male amateur futsal players (age 22.8 ± 6.1 years; mass 76.0 ± 10.2 kg; height 178.7 ± 6.6 cm; VO2max 58.1 ± 4.5 mL kg(-1) min(-1)) performed a maximal incremental running test for the determination of the gas exchange threshold (GET) and maximal VO2 (VO2max). On two different days, the subjects completed a 6-min bout of high-intensity running (50 % ∆) on a treadmill that was 6-min after (1) an identical bout of high-intensity exercise (from control to CE), and (2) a protocol of IRS (6 × 40 m).
  
  
  RESULTS
  We found significant differences between CE and IRS for the blood lactate concentration ([La]; 6.1 versus 10.7 mmol L(-1), respectively), VO2 baseline (0.74 versus 0.93 L min(-1), respectively) and the heart rate (HR; 102 versus 124 bpm, respectively) before the onset of high-intensity exercise. However, both prior CE and prior IRS significantly increased the absolute primary VO2 amplitude (3.77 and 3.79 L min(-1), respectively, versus control 3.54 L min(-1)), reduced the amplitude of the VO2 slow component (0.26 and 0.21 L min(-1), respectively, versus control 0.50 L min(-1)), and decreased the mean response time (MRT; 28.9 and 28.0 s, respectively, versus control 36.9 s) during subsequent bouts.
  
  
  CONCLUSIONS
  This study showed that different protocols and intensities of prior exercise trigger similar effects on VO2 kinetics during high-intensity running.
authors.affiliation: Physical Effort Laboratory, Sports Center, Federal University of Santa Catarina, Florianopolis, Brazil, nascimentopc84@hotmail.com.
authors.forename: Paulo Cesar
authors.initials: PC
authors.lastname: do Nascimento
authors.forename: Ricardo Dantas
authors.initials: RD
authors.lastname: de Lucas
authors.forename: Kristopher Mendes
authors.initials: KM
authors.lastname: de Souza
authors.forename: Rafael Alves
authors.initials: RA
authors.lastname: de Aguiar
authors.forename: Benedito Sérgio
authors.initials: BS
authors.lastname: Denadai
authors.forename: Luiz Guilherme Antonacci
authors.initials: LG
authors.lastname: Guglielmo
mesh_terms: D000328:Adult; D056352:Athletes; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D012420:Running / Q000145:classification / Q000502:physiology*