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.