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European Journal of Applied Physiology

, Volume 99, Issue 2, pp 103–111 | Cite as

Constant versus variable-intensity during cycling: effects on subsequent running performance

  • Thierry Bernard
  • Fabrice Vercruyssen
  • Cyrille Mazure
  • Philippe Gorce
  • Christophe Hausswirth
  • Jeanick Brisswalter
Original Article

Abstract

The aim of this study was to investigate the metabolic responses to variable versus constant-intensity (CI) during 20-km cycling on subsequent 5-km running performance. Ten triathletes, not only completed one incremental cycling test to determine maximal oxygen uptake and maximal aerobic power (MAP), but also three various cycle-run (C–R) combinations conducted in outdoor conditions. During the C–R sessions, subjects performed first a 20-km cycle-time trial with a freely chosen intensity (FCI, ∼80% MAP) followed by a 5-km run performance. Subsequently, triathletes were required to perform in a random order, two C–R sessions including either a CI, corresponding to the mean power of FCI ride, or a variable-intensity (VI) during cycling with power changes ranging from 68 to 92% MAP, followed immediately by a 5-km run. Metabolic responses and performances were measured during the C–R sessions. Running performance was significantly improved after CI ride (1118 ± 72 s) compared to those after FCI ride (1134 ± 64 s) or VI ride (1168 ± 73 s) despite similar metabolic responses and performances reported during the three cycling bouts. Moreover, metabolic variables were not significantly different between the run sessions in our triathletes. Given the lack of significant differences in metabolic responses between the C–R sessions, the improvement in running time after FCI and CI rides compared to VI ride suggests that other mechanisms, such as changes in neuromuscular activity of peripheral skeletal muscle or muscle fatigue, probably contribute to the influence of power output variation on subsequent running performance.

Keywords

Triathletes Variable-intensity Running performance Metabolic responses 

Notes

Acknowledgments

The authors gratefully acknowledge all the triathletes who took part in the experiment for their high cooperation and motivation.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Thierry Bernard
    • 1
  • Fabrice Vercruyssen
    • 1
  • Cyrille Mazure
    • 1
  • Philippe Gorce
    • 1
  • Christophe Hausswirth
    • 2
  • Jeanick Brisswalter
    • 1
  1. 1.Department of Sport Ergonomic and Performance, UFR STAPSUniversity of Sud Toulon-VarLa Garde CedexFrance
  2. 2.Laboratory of Biomechanics and PhysiologyFrench National Institute of Sport and Physical Education (INSEP)ParisFrance

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