New Zealand blackcurrant extract enhances muscle oxygenation during repeated intermittent forearm muscle contractions in advanced and elite rock climbers

Fryer, Simon, Giles, Dave, Bird, Ellis L., Stone, Keeron, Paterson, Craig, Balas, Jiri, Willems, Mark E. T., Potter, Julia A. and Perkins, Ian (2020) New Zealand blackcurrant extract enhances muscle oxygenation during repeated intermittent forearm muscle contractions in advanced and elite rock climbers. European Journal of Sport Science. pp. 1-21. ISSN 1746-1391

[img] Text (This is an Accepted Manuscript of an article published by Taylor & Francis in European Journal of Sport Science on 23/09/2020, available online: http://www.tandfonline.com/10.1080/17461391.2020.1827048)
Fryer et al 2020 accepted version.doc - Accepted Version
Restricted to Repository staff only until 23 September 2021.
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Abstract

Anthocyanin-rich New Zealand blackcurrant (NZBC) may improve forearm muscle oxygenation and enhance performance in high-level rock climbers. As such, using a double-blind, randomized, cross-over design study, twelve participants performed an oxidative capacity assessment, and two successive exhaustive exercise trials (submaximal forearm muscle contractions at 60 % of their maximal volitional contraction). Each visit was conducted following 7-days intake of 600 mg·day-1 NZBC extract or placebo. Oxidative capacity was estimated by calculating the oxygen half time recovery using near infrared spectroscopy. Time to exhaustion (s), impulse (kg·s), and minimum tissue saturation index (min-TSI %) were assessed during both the exercise trials. Muscle oxidative capacity was greater with NZBC (mean difference [MD] = 5.3 s, 95% confidence intervals [95% CI] = 0.4 – 10.2 s; p = 0.036; Cohen’s d = 0.94). During the exercise trials, there was an interaction for min-TSI % (time x condition, p = 0.046; ηp2 = 0.372), which indicated a greater level of oxygen extraction during trial two with NZBC extract (MD = 9 %, 95% CI = 2-15 %) compared to the placebo (MD = 2 %, 95% CI = 1 - 7 %). There was a decrease in time to exhaustion (p <0.001, ηp2 =0.693) and impulse (p = 0.001, ηp2 =0.672) in exercise trial two, with no effect of NZBC extract. In high level rock climbers 7-days NZBC extract improves forearm muscle oxygenation with no effect on isolated forearm muscle performance.

Item Type: Article
Uncontrolled Keywords: Supplement, nutrition, ergogenic aid; sport climbing, bouldering, rock-climbing
Subjects: Q Science > QP Physiology
R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Departments > Physical Education and Sports Coaching
Depositing User: Mark Willems
Date Deposited: 24 Sep 2020 07:59
Last Modified: 02 Oct 2020 12:57
URI: http://eprints.chi.ac.uk/id/eprint/5341

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