Perkins Ian C, Blacker Sam D, Willems Mark E T
Institute of Education and Social Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK.
Institute of Applied Sciences, University of Chichester, College Lane, Chichester PO19 6PE, UK.
Nutrients. 2024 Dec 10;16(24):4253. doi: 10.3390/nu16244253.
Intake of New Zealand blackcurrant (NZBC) extract for 7 days has been shown to improve high-intensity intermittent running (HIIR) performance.
We examined the repeat response of NZBC extract on HIIR performance.
Sixteen active males (age: 23 ± 3 yrs, height: 179 ± 5 cm, mass: 79 ± 11 kg, V˙O: 55.3 ± 5 mL∙kg∙min, velocity at V˙O: 17.2 ± 0.8 km∙h, mean ± SD) participated. Familiarized subjects completed the HIIR test at individualized exercise intensities with stages consisting of six 19 s high-intensity running bouts interspersed by 15 s of low-intensity running and 1 min of inter-stage rest. The test was repeated at increasing speeds until exhaustion, under four conditions; two with a daily dose of 600 mg of NZBC extract (CurraNZ™, providing 210 mg anthocyanins) and two with a placebo, each over 7 days. The study used a double-blind, randomized, cross-over design with a wash-out period of at least 14 days.
For the cohort, there were no differences between the placebo and NZBC conditions for mean heart rate ( = 0.071), mean oxygen uptake ( = 0.713), and mean lactate ( = 0.121) at exhaustion for the HIIR. The NZBC extract increased the mean total running distance and mean high-intensity running distance by 7.9% and 8.0% compared to the placebo. With NZBC extract, 8 of the 16 participants (50%) enhanced in both trials beyond the smallest worthwhile change for total running distance (≥173 m) and high-intensity running distance (≥111 m). For repeated responders, total running distance and high-intensity running distance was increased by 16.7% (95% CI [11.0, 22.4%] and 16.6% (95% CI [11.0, 22.2%]. Three participants had enhanced running performance in one trial beyond the SWC, and five participants were considered non-responders.
This is the first study on the repeated response by an anthocyanin-rich supplement on high-intensity running performance. New Zealand blackcurrant extract can substantially enhance intermittent high-intensity running performance in consistent responders. Future work should examine dosing strategies of New Zealand blackcurrant, and whether a repeated response rate exceeding 50% can be attained. These findings suggest that NZBC extract could be beneficial for athletes participating in high-intensity team sports.
已证明连续7天摄入新西兰黑加仑（NZBC）提取物可改善高强度间歇跑（HIIR）表现。
我们研究了NZBC提取物对HIIR表现的重复效应。
16名活跃男性（年龄：23±3岁，身高：179±5厘米，体重：79±11千克，摄氧量：55.3±5毫升·千克·分钟，摄氧量时的速度：17.2±0.8千米·小时，均值±标准差）参与研究。熟悉测试的受试者在个体化运动强度下完成HIIR测试，测试阶段包括六次19秒的高强度跑步，中间穿插15秒的低强度跑步和1分钟的阶段间休息。测试以递增速度重复进行直至力竭，共四种情况；两种情况为每日服用600毫克NZBC提取物（CurraNZ™，提供210毫克花青素），两种情况为服用安慰剂，每种情况持续7天。该研究采用双盲、随机、交叉设计，洗脱期至少为14天。
对于该队列，在HIIR力竭时，安慰剂组和NZBC组在平均心率（P = 0.071）、平均摄氧量（P = 0.713）和平均乳酸水平（P = 0.121）方面无差异。与安慰剂相比，NZBC提取物使平均总跑步距离和平均高强度跑步距离分别增加了7.9%和8.0%。服用NZBC提取物后，16名参与者中有8名（50%）在两次试验中总跑步距离（≥173米）和高强度跑步距离（≥111米）的提升超过了最小有意义变化。对于重复应答者，总跑步距离和高强度跑步距离分别增加了16.7%（95%置信区间[11.0, 22.4%]）和16.6%（95%置信区间[11.0, 22.2%]）。三名参与者在一次试验中的跑步表现提升超过了最小有意义变化，五名参与者被视为无应答者。
这是第一项关于富含花青素的补充剂对高强度跑步表现重复效应的研究。新西兰黑加仑提取物可显著提高持续应答者的间歇高强度跑步表现。未来的研究应探讨新西兰黑加仑的给药策略，以及是否能达到超过50%的重复应答率。这些发现表明，NZBC提取物可能对参与高强度团队运动的运动员有益。
