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Effect of New Zealand Blackcurrant Extract on Cycling Performance and Substrate Oxidation in Normobaric Hypoxia in Trained Cyclists

Willems, M.E. ORCID: https://orcid.org/0000-0003-4385-8739, Şahin, M.A. ORCID: https://orcid.org/0000-0002-6400-8410, Berendsen, T. and Cook, Matthew ORCID: https://orcid.org/0000-0002-6293-7566 (2019) Effect of New Zealand Blackcurrant Extract on Cycling Performance and Substrate Oxidation in Normobaric Hypoxia in Trained Cyclists. Sports, 7 (3). e67. ISSN 2075-4663

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Abstract

This study explored New Zealand blackcurrant (NZBC) extract for enhanced exercise-induced fat oxidation and 16.1 km cycling time trial (TT) performance in normobaric normoxia. The effect of NZBC extract on physiological and metabolic responses was examined during steady state cycling and a 16.1 km TT in normobaric hypoxia. This study used a randomized, double-blind, crossover design. Eleven healthy male cyclists (age: 38 ± 11 y, height: 179 ± 4 cm, body mass: 76 ± 8 kg, V ˙ O2max: 47 ± 5 mL·kg−1·min−1, mean ± SD) ingested NZBC extract (600 mg·day−1 CurraNZ® containing 210 mg anthocyanins) or a placebo (600 mg microcrystalline cellulose M102) for seven days (washout 14 days) and performed a steady state cycling test (3 × 10 min at 45%, 55% and 65% V ˙ O2max) followed by a 16.1 km TT at a simulated altitude of ~2500 meters (~15% of O2). Indirect calorimetry was used to measure substrate oxidation during steady state cycling. Intake of NZBC extract had no effect on blood glucose and lactate, heart rate, substrate oxidation, and respiratory exchange ratio during steady state cycling at 45%, 55% and 65% V ˙ O2max, and on 16.1 km TT performance (placebo: 1685 ± 92 s, NZBC extract: 1685 ± 99 s, P = 0.97). Seven days intake of New Zealand blackcurrant extract does not change exercise-induced metabolic responses and 16.1 km cycling time trial performance for moderately endurance-trained men in normobaric hypoxia.

Item Type: Article
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/

Uncontrolled Keywords: time trial, substrate oxidation, hypoxia, anthocyanins, indirect calorimetry, New Zealand blackcurrant, sports nutrition
Subjects: Q Science > QP Physiology
Divisions: Divisions (2019 and before) > Academic Departments > Institute of Sport and Exercise Science
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Copyright Info: Open access article
SWORD Depositor: Prof. Pub Router
Depositing User: Matthew Cook
Date Deposited: 19 Mar 2019 08:48
Last Modified: 18 Sep 2019 08:10
URI: https://eprints.worc.ac.uk/id/eprint/7737

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