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The influence of different sources of polyphenols on sub-maximal cycling and time trial performance

journal contribution
posted on 2020-01-31, 12:09 authored by Tom CliffordTom Clifford, Nigel Mitchell, Andrew Scott
The primary purpose of the study was to establish the effects of commercially available polyphenol-rich antioxidant supplements, Pycnogenol® with added bioflavonoids (PYC-B) and CherryActive (CHA), on 20 km cycling performance. Using a double-blind counterbalanced, repeated-measures design, nine male cyclists or triathletes (32.1 ± 11.2 years; maximal aerobic capacity 4.2 ± 0.7 L•min-1; maximal power output 391.7 ± 39.5 watts) consumed 200 mg of CHA, 120 mg of PYC-B, or 200 mg of placebo (PLA) capsules, 2 days before and on the day of each experimental trial. The experimental trials consisted of four 5 minute stages at 40%, 50%, 60%, and 70% maximal power output (Wmax), followed by a 20 km time trial (TT). Statistical analysis revealed no significant differences between trials for heart rate, respiratory exchange ratio, gross mechanical efficiency, oxygen consumption, or blood lactate, at any of the intensities completed during the initial 20 minute phase of the trial (p>0.05). Final 20 km TT times were not significantly different between trials (p=0.115), but, compared to PLA, PYC-B did significantly increase power output by 6.2% over the final 5 km of the TT (p=0.022). The study suggests that the PYC-B supplement could be beneficial towards the end of an intense bout of cycling exercise. However, as total 20 km time was not significantly different between trials the doses used are unlikely to benefit 20 km cycling time trial performance.

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Athletic Enhancement

Volume

2

Issue

6

Publisher

SciTechnol

Version

  • AM (Accepted Manuscript)

Rights holder

© SciTechnol

Publisher statement

This paper was accepted for publication in the journal Journal of Athletic Enhancement and the definitive published version is available at https://doi.org/10.4172/2324-9080.1000130.

Acceptance date

2013-12-19

Publication date

2013-12-22

Copyright date

2013

ISSN

2324-9080

Language

  • en

Depositor

Dr Tom Clifford. Deposit date: 31 January 2020

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