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Blackcurrant extract does not affect the speed-duration relationship during high-intensity running.

Eleni Pastellidou1, Eric Gillespie1, Anton McGrotty1

  • 1School of Life Sciences and Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.

European Journal of Sport Science
|July 1, 2020
PubMed
Summary

Blackcurrant extract (BC) supplementation did not improve high-intensity exercise performance or critical speed in male runners. While some individuals showed a trend towards improvement, overall results indicate no significant ergogenic effect from BC.

Keywords:
Anthocyaninblackcurrant extractcritical speedhigh-intensity exercisespeed–tolerable duration

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Area of Science:

  • Exercise Physiology
  • Nutritional Science
  • Sports Performance

Background:

  • Anthocyanin-rich blackcurrant extract (BC) is proposed to enhance high-intensity exercise performance.
  • The hyperbolic speed-tolerable duration (S-Dtol) relationship, defined by critical speed (CS) and D', is a key metric for evaluating exercise capacity.

Purpose of the Study:

  • To investigate the ergogenic effects of daily blackcurrant extract (BC) supplementation on high-intensity exercise performance.
  • To assess the impact of BC on the speed-tolerable duration (S-Dtol) relationship, including critical speed (CS) and D', and time to exhaustion.

Main Methods:

  • A double-blinded, cross-over randomized controlled trial involving 15 males.
  • Participants underwent treadmill running incremental exercise testing to determine CS and D' after supplementation with 300 mg/d BC (105 mg/d anthocyanin) or placebo.
  • Evaluated time to exhaustion, maximal oxygen uptake (VO2max), lactate threshold (LT), submaximal running economy (CR), and substrate utilization.

Main Results:

  • BC supplementation did not significantly alter critical speed (CS) or D' compared to placebo.
  • No significant changes were observed in time to exhaustion, VO2max, LT, CR, or substrate utilization.
  • A trend towards increased D' was noted in 60% of participants, suggesting potential benefits in specific cohorts.

Conclusions:

  • Blackcurrant extract (BC) supplementation did not demonstrate a significant ergogenic effect on high-intensity running exercise in this cohort.
  • Key physiological determinants of endurance performance, including the S-Dtol relationship, VO2max, LT, and CR, were not improved by BC supplementation.