New Zealand Blackcurrant Extract Enhances Muscle Oxygenation During Forearm Exercise in Intermediate-Level Rock Climbers

Fryer, Simon, Perkins, Ian, Paterson, C., Gloucester, C., Willems, Mark E. T. and Potter, Julia A. (2020) New Zealand Blackcurrant Extract Enhances Muscle Oxygenation During Forearm Exercise in Intermediate-Level Rock Climbers. International Journal of Sport Nutrition and Exercise Metabolism, 30 (4). pp. 258-263. ISSN 1526-484X

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Abstract

The delivery to and utilisation of oxygenated haemoglobin to the forearm muscles are key determinants of rock-climbing performance. Anthocyanin-rich New Zealand blackcurrant (NZBC) has been suggested to improve blood flow and may enhance forearm endurance performance. As such, a double-blind, randomized, cross-over design study with 12 participants performed submaximal intermittent contractions (at 40% maximal voluntary contraction) to failure after a 7-day intake of 600 mg·day-1 NZBC extract or placebo. Minimum tissue saturation index (min TSI%) was assessed during the contractions. During recovery, time to half recovery (TTHR) of TSI%, and brachial artery blood flow were assessed. There was no difference in time to exhaustion between NZBC and placebo. Min TSI% was lower with NZBC extract (43 ± 8 vs. 50 ± 11 TSI%; p=0.007; Cohens’d=1.01). During recovery, there was no effect on brachial artery blood flow. However, TTHR was faster with NZBC (26 ± 17 vs. 42 ± 26 s; p=0.001; Cohens’d=1.3) following exhaustive contractions. Seven days of NZBC extract appears to improve muscle oxygenation during and following contractions with no change in either arterial blood flow or forearm endurance performance.

Item Type: Article
Uncontrolled Keywords: Anthocyanins; isometric exercise; ergogenic aid; vasodilation; blood flow; NIRS
Subjects: Q Science > Q Science (General)
Q Science > QP Physiology
Divisions: Departments > Physical Education and Sports Coaching
Departments > Sport and Exercise Sciences
Related URLs:
Depositing User: Mark Willems
Date Deposited: 13 Mar 2020 10:57
Last Modified: 22 Jun 2020 10:26
URI: http://eprints.chi.ac.uk/id/eprint/5096

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