title: Influence of cycling cadence on subsequent running performance in triathletes.
abstract: OBJECTIVE
  The purpose of this study was to investigate the influence of different cycling cadences on metabolic and kinematic parameters during subsequent running.
  
  
  METHODS
  Eight triathletes performed two incremental tests (running and cycling) to determine maximal oxygen uptake (VO2max) and ventilatory threshold (VT) values, a cycling test to assess the energetically optimal cadence (EOC), three cycle-run succession sessions (C-R, 30-min cycle + 15-min run), and one 45-min isolated run (IR). EOC, C-R, and IR sessions were realized at an intensity corresponding to VT + 5%. During the cycling bouts of C-R sessions, subjects had to maintain one of the three pedaling cadences corresponding to the EOC (72.5 +/- 4.6 rpm), the freely chosen cadence (FCC; 81.2 +/- 7.2 rpm), and the theoretical mechanical optimal cadence (MOC, 90 rpm; Neptune and Hull, 1999).
  
  
  RESULTS
  Oxygen uptake (VO2) increased during the 30-min cycling only at MOC (+12.0%) and FCC (+10.4%). During the running periods of C-R sessions, VO2, minute ventilation, and stride-rate values were significantly higher than during the IR session (respectively, +11.7%, +15.7%, and +7.2%). Furthermore, a significant effect of cycling cadence was found on VO2 variability during the 15-min subsequent run only for MOC (+4.1%) and FCC (+3.6%).
  
  
  CONCLUSIONS
  The highest cycling cadences (MOC, FCC) contribute to an increase in energy cost during cycling and the appearance of a VO2 slow component during subsequent running, whereas cycling at EOC leads to a stability in energy cost of locomotion with exercise duration. Several hypotheses are proposed to explain these results such as changes in fiber recruitment or hemodynamic modifications during prolonged exercise.
authors.affiliation: Unité Ergonomie Sportive et Performance, Université de Toulon-Var, La Garde, France. vercruyssen@univ-tln.fr
authors.forename: Fabrice
authors.initials: F
authors.lastname: Vercruyssen
authors.forename: Jeanick
authors.initials: J
authors.lastname: Brisswalter
authors.forename: Christophe
authors.initials: C
authors.lastname: Hausswirth
authors.forename: Thierry
authors.initials: T
authors.lastname: Bernard
authors.forename: Olivier
authors.initials: O
authors.lastname: Bernard
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Vallier
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001696:Biomechanical Phenomena; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006339:Heart Rate; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D012123:Pulmonary Ventilation; D012420:Running / Q000502:physiology*