title: Effect of prior warm-up duration on the time limit at peak speed in untrained men.
abstract: BACKGROUND
  The peak speed (Vpeak) and its time limit (tlim) are variables used to prescribe training loads and the intervals durations during interval training, respectively. The aim of this study was to test different warm-up durations (5, 10 and 15 minutes), adapted from the protocol proposed by Billat et al.,1 to determine tlim in untrained men.
  
  
  METHODS
  Fifteen untrained men were submitted to the following laboratory evaluations: 1) an incremental running exercise test on a treadmill starting with a speed of 8 km/h, after a warm-up of walking at 6 km/h for three minutes, and increased by 1 km/h between each successive 3-minute stage until volitional exhaustion to determine Vpeak; 2) three rectangular tests, performed in randomized order, with warm-up durations of 5, 10, and 15 minutes at 60% of Vpeak to determine the tlim5, tlim10, and tlim15; after the warm-up the tests were performed at the speed of the individual Vpeak until volitional exhaustion.
  
  
  RESULTS
  It was demonstrated that the duration of the warm-up affected the test duration (tlim). Significant differences were observed between tlim5 and tlim15, and between tlim10 and tlim15. However, tlim15 and tlim10 did not differ. Additionally, duration of the warm-up did not influence other variables (HRmax, RPEmax and post lactate concentrations).
  
  
  CONCLUSIONS
  Therefore, it was concluded that the duration of the warm-up in tlim tests modifies the test duration in untrained men.
authors.affiliation: Department of Physical Education, State University of Maringá, Maringá, Brazil.
authors.forename: Victor H
authors.initials: VH
authors.lastname: da Cruz
authors.affiliation: Department of Physical Education, State University of Maringá, Maringá, Brazil - ceciliapeserico@gmail.com.
authors.forename: Cecília S
authors.initials: CS
authors.lastname: Peserico
authors.affiliation: Department of Physical Education, State University of Maringá, Maringá, Brazil.
authors.forename: Fabiana A
authors.initials: FA
authors.lastname: Machado
mesh_terms: D000328:Adult; D005080:Exercise Test / Q000379:methods*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology; D012420:Running / Q000502:physiology*; D013997:Time Factors; D063996:Warm-Up Exercise / Q000502:physiology*; D055815:Young Adult