Department of Sport and Exercise Sciences, University of Chester, Chester, United Kingdom.
Liverpool John Moores University, Liverpool, England.
Int J Sport Nutr Exerc Metab. 2023 Aug 30;33(6):323-330. doi: 10.1123/ijsnem.2023-0029. Print 2023 Nov 1.
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 [V˙O2max] 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.
这项研究调查了急性剂量（900 毫克）新西兰黑加仑（NZBC）提取物对 5 公里跑步表现的影响，以及相关的生理和代谢反应。16 名训练有素的男性跑步者（年龄 26 ± 5 岁，身高 173.4 ± 7.3 厘米，体重 73.7 ± 6.9 公斤，最大摄氧量[V˙O2max]55.4 ± 6.1 ml·kg-1·min-1）以双盲、随机、交叉设计的方式，在运动前 2 小时分别服用含有 NZBC 提取物（3×300mg CurraNZ，315mg 花青素）或匹配安慰剂（3×300mg 无麸质面粉）的胶囊。在跑步机上进行 10 分钟的乳酸阈运动后，进行 5 公里计时赛，评估运动表现、生理和代谢反应。NZBC 提取物不会改变乳酸阈运动的生理或代谢反应（摄氧量、呼吸交换比、分钟通气量、碳水化合物氧化、脂肪氧化、心率、血乳酸或感知用力程度，p>.05）。与安慰剂相比，在 NZBC 提取物条件下完成 5 公里计时赛的时间更快（NZBC：1,308.96±122.36 s，安慰剂：1,346.33±124.44，p=0.001，d=-0.23，置信区间范围为[-0.46，0.00 s]）。在 5 公里计时赛中，两种条件下的生理或代谢反应没有明显差异（p>.05）。摄入 900 毫克的 NZBC 提取物作为急性剂量可提高训练有素的男性跑步者的表现，而不会改变运动时的生理或代谢反应。需要进一步研究以评估更广泛的可能机制（例如心血管功能、代谢物谱），以深入了解补充后性能的提高。
