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European Journal of Applied Physiology

, Volume 95, Issue 5–6, pp 543–549 | Cite as

The effects of an antioxidant-supplemented beverage on exercise-induced oxidative stress: results from a placebo-controlled double-blind study in cyclists

  • J. Morillas-Ruiz
  • P. Zafrilla
  • M. Almar
  • M. J. Cuevas
  • F. J. López
  • P. Abellán
  • J. A. Villegas
  • J. González-GallegoEmail author
Original Article

Abstract

The objective of this study was to test the effects of an antioxidant-supplemented beverage on exercise-induced oxidative stress in moderately trained cyclists. A double-blind study was conducted in moderately trained cyclists. They were randomly allocated to receive either an antioxidant (13 subjects) or a placebo (13 subjects) 15 min pre-exercise (30 ml.kg−1) and during a 90 min constant-load test (30 ml.kg−1.15 min−1) on a bicycle ergometer at 70% \({\dot{{\it V}}}{\text{O}}_{2\max}.\) The supplemented beverage contained black grape (81 g/l), raspberry (93 g/l) and red currant (39 g/l) concentrates, and its total antioxidant capacity, measured by the ABTS.+ technique, was 0.41 mM Trolox. No significant difference from basal to post-exercise period was detected for plasma TBARS in either the placebo group or the group receiving the antioxidant supplemented beverage. Post-exercise carbonyls decreased by 29% in the group receiving antioxidants, and the pattern of change was significantly different between antioxidant and placebo conditions. The urinary excretion of 8-OHdG increased significantly by 21% in the placebo group. Again differences in the pre- to post-exercise change were significant between both conditions These results suggest that in moderately trained cyclists, antioxidant supplementation counters oxidative stress induced by a 90 min exercise at 70% \({\dot{{\it V}}}{\text{O}}_{2\max}.\)

Keywords

Exercise Antioxidant DNA oxidation Lipid peroxidation Protein oxidation 

Notes

Acknowledgements

We are grateful to S. Sánchez, A. Gómez and G. Caravaca for technical assistance. We are also indebted to the members of the L.T.I. (Laboratorio de Técnicas Instrumentales) of the University of León, and especially to J.C. García-Glez, for their helpful advice.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • J. Morillas-Ruiz
    • 2
  • P. Zafrilla
    • 2
  • M. Almar
    • 1
  • M. J. Cuevas
    • 1
  • F. J. López
    • 2
  • P. Abellán
    • 3
  • J. A. Villegas
    • 2
  • J. González-Gallego
    • 1
    Email author
  1. 1.Department of PhysiologyUniversity of LeónLeónSpain
  2. 2.Department of PhysiologyCatholic University of MurciaMurciaSpain
  3. 3.Hero España, Research and DevelopmentMurciaSpain

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