This study investigated the effects of an acute dose (900 mg) of New Zealand Blackcurrant (NZBC) extract on 5-km running performance, alongside associated physiological and metabolic responses. Sixteen trained male runners (age 26 ± 5 years, stature 173.4 ± 7.3 cm, body mass 73.7 ± 6.9 kg, maximal oxygen consumption [${\dot{\mathrm{V}}\mathrm{O}}_2\text{max}$] 55.4 ± 6.1 ml·kg⁻¹·min⁻¹) ingested either capsules containing NZBC extract (3 × 300 mg CurraNZ, 315 mg anthocyanins) or a matched placebo (3 × 300 mg gluten-free flour) 2 hr before exercise in a double-blind, randomized, crossover design. Performance time, physiological, and metabolic responses were assessed in a 5-km time trial, preceded by 10-min exercise at the lactate threshold on a treadmill. NZBC extract did not alter the physiological or metabolic responses to exercise at the lactate threshold (oxygen uptake, respiratory exchange ratio, minute ventilation, carbohydrate oxidation, fat oxidation, heart rate, blood lactate, or rating of perceived exertion, p > .05). The 5-km time trial was completed in a faster time in the NZBC extract condition compared with placebo (NZBC: 1,308.96 ± 122.36 s, placebo: 1,346.33 ± 124.44, p = .001, d = −0.23, confidence interval range = [−0.46, 0.00 s]). No differences in physiological or metabolic responses were apparent between conditions for the 5-km time trial (p > .05). Ingesting 900 mg of NZBC extract as an acute dose improves performance in trained male runners without altering physiological or metabolic responses to exercise. Further research is needed to assess a wider range of possible mechanisms (e.g., cardiovascular function, metabolite profiles) to advance insight into improved performance following supplementation.

本研究调查了急性剂量（900 毫克）新西兰黑加仑 (NZBC) 提取物对 5 公里跑步表现以及相关生理和代谢反应的影响。16名训练有素的男性跑步运动员（年龄26±5岁，身高173.4±7.3厘米，体重73.7±6.9公斤，最大耗氧量[${\dot{\mathrm{V}}\mathrm{氧}}_2\text{最大限度}$] 55.4 ± 6.1 ml·kg ⁻¹ ·min ⁻¹ ) 在运动前 2 小时摄入含有 NZBC 提取物的胶囊（3 × 300 mg CurraNZ，315 mg 花青素）或匹配的安慰剂（3 × 300 mg 无麸质面粉）双盲、随机、交叉设计。在 5 公里计时赛中评估表现时间、生理和代谢反应，然后在跑步机上进行 10 分钟的乳酸阈值锻炼。NZBC 提取物不会改变乳酸阈值下运动的生理或代谢反应（摄氧量、呼吸交换比、每分钟通气量、碳水化合物氧化、脂肪氧化、心率、血乳酸或感知用力评级，p > .05  ） 。与安慰剂相比，在 NZBC 提取物条件下，5 公里计时试验的完成时间更快（NZBC：1,308.96 ± 122.36 秒，安慰剂：1,346.33 ± 124.44，p = .001，d = −0.23，置信区间范围 = [  − 0.46，0.00 秒]）。在 5 公里计时赛的条件下，生理或代谢反应没有明显差异 ( p  > .05)。急性剂量摄入 900 毫克 NZBC 提取物可以提高受过训练的男性跑步者的表现，而不会改变运动的生理或代谢反应。需要进一步的研究来评估更广泛的可能机制（例如，心血管功能、代谢物概况），以深入了解补充剂后性能的改善。