Effect of New Zealand blackcurrant extract on cycling performance across quartile distances and the final km of a 16.1 km time-trial.

Cook, Matthew D., Myers, Stephen D., Blacker, Sam D. and Willems, Mark E. T. (2015) Effect of New Zealand blackcurrant extract on cycling performance across quartile distances and the final km of a 16.1 km time-trial. In: International Sport and Exercise Nutrition Conference, 16-18 December 2014, Newcastle upon Tyne.

[img] Image
ISENC 2014 Poster final.pdf
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

Peripheral blood flow is increased by blackcurrant intake in humans, potentially via anthocyanin-induced vasorelaxation and vasodilation, which may affect performance and pacing strategy in a cycling time-trial (TT). We examined the effect of 7-days New Zealand blackcurrant (BC) extract on performance in each quartile and the last km of a 16.1 km TT. Fourteen trained male cyclists (>3 years experience; mean ± SD; age: 38 ± 13 years; height: 178 ± 4 cm; body mass: 77 ± 9 kg; V̇O2max: 53 ± 6 mL∙kg-1∙min-1, maximum power: 365 ± 36 W) completed two familiarization and two experimental time trials on an electronically braked ergometer (SRM ergometer, SRM International, Germany). Each experimental TT was preceded by 7-days supplementation of either New Zealand blackcurrant extract (300 mg∙day-1 CurraNZ™; containing 105 mg anthocyanin, Health Currancy Ltd, UK) or placebo (PL, 300 mg∙day-1 microcrystalline cellulose M102), in capsules. Experimental time-trials were separated by a 14-day washout period of the supplementation in a randomized, double-blind, cross-over design. Performance in each quartile and the last km was analyzed with paired t-tests and significance accepted at p ≤ .05. BC improved the 16.1 km TT performance by 2.4% (BC vs. PL: 1678 ± 108 vs. 1722 ± 131 s, p = .02) and allowed faster cycling speed in the 4-8 km (BC: 34.6 ± 2.2 vs. PL: 33.9 ± 2.4 km∙h-1, p = .02), 8-12 km (BC: 34.3 ± 2.3 vs.PL: 33.5 ± 2.7 km∙h-1, p = .04) and 12-16.1 km (BC: 35.2 ± 2.6 vs. PL: 34.2 ± 2.8 km∙h-1, p = .04) sectors. There was no difference in cycling speed between conditions for the last km (BC: 37.8 ± 4.1 vs. PL: 36.2 ± 3.1 km∙h-1, p > .05). Heart rate and cadence were similar between conditions in each sector and the last km of the 16.1 km TT. Intake of New Zealand BC extract allowed an increase in cycling performance for the last 75% of a 16.1 km TT. It is concluded that 7-days intake of New Zealand blackcurrant extract (CurraNZ™) has a favorable effect on overall cycling TT performance in endurance-trained athletes with implications for pacing strategy, as the performance improvement was not due to an enhanced final km.

Item Type: Conference or Workshop Item (Poster)
Subjects: Q Science > QP Physiology
Divisions: Research Centres > CCASES
Departments > Sport and Exercise Sciences
Event Title: International Sport and Exercise Nutrition Conference
Event Location: Newcastle upon Tyne
Event Dates: 16-18 December 2014
Depositing User: Mark Willems
Date Deposited: 27 Feb 2015 12:47
Last Modified: 13 Feb 2018 13:22
URI: http://eprints.chi.ac.uk/id/eprint/1346

Actions (login required)

View Item View Item