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

Pastellidou, E., Gillespie, E., McGrotty, A., Spence, J., McCloskey, W., Johnston, L., Wilson, J. and Kemi, O. J. (2021) Blackcurrant extract does not affect the speed-duration relationship during high-intensity running. European Journal of Sport Science, 21(4), pp. 552-561. (doi: 10.1080/17461391.2020.1771428) (PMID:32602793)

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Abstract

Anthocyanin-rich blackcurrant extract (BC) has been shown to ergogenically aid high-intensity exercise. Capacity for such exercise is evaluated by the hyperbolic speed–tolerable duration (S–Dtol) relationship. Therefore, in double-blinded and cross-over randomised controlled trials, 15 males underwent treadmill running incremental exercise testing and were assessed for S–Dtol, quantified by critical speed (CS) and D’ (distance), and assessments of time to exhaustion performance to empirically test the limits of the S–Dtol relationship, after daily supplementation of 300 mg/d BC (105 mg/d anthocyanin) or placebo. Supplementation with BC did not change CS (placebo 12.1 ± 1.0 km/h vs BC 11.9 ± 1.0 km/h, p > .05) or D’ (placebo 918.6 ± 223.2 m vs BC 965.2 ± 231.2 m, p > .05), although further analysis indicated D’ increased in 60% of subject (p = .08), indicating a trend toward cohorts potentially benefiting from BC supplementation. BC supplementation did not change time to exhaustion at or above CS, maximal oxygen uptake (VO2max), lactate threshold (LT), submaximal running economy (CR), or substrate utilisation during exercise (all p > .05). In conclusion, we could not detect any beneficial effect of BC supplementation during high-intensity running exercise, including the determining factors S–Dtol relationship, VO2max, LT or CR. Hence, no ergogenic effect was observed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wilson, John and Kemi, Dr Ole and Spence, Mr Joshua and Pastellidou, Eleni and Johnston, Miss Lynsey
Authors: Pastellidou, E., Gillespie, E., McGrotty, A., Spence, J., McCloskey, W., Johnston, L., Wilson, J., and Kemi, O. J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
College of Medical Veterinary and Life Sciences > School of Life Sciences
Journal Name:European Journal of Sport Science
Publisher:Taylor & Francis
ISSN:1746-1391
ISSN (Online):1536-7290
Published Online:30 June 2020
Copyright Holders:Copyright © 2020 European College of Sport Science
First Published:First published in European Journal of Sport Science 21(4): 552-561
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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