Murphy Connor A, Cook Matthew D, Willems Mark E T
Department of Sport and Exercise Sciences, University of Chichester, College Lane, Chichester, West Sussex PO19 6PE, UK.
Institute of Sport and Exercise Science, University of Worcester, Henwick Grove, Worcester WR2 6AJ, UK.
Sports (Basel). 2017 May 9;5(2):25. doi: 10.3390/sports5020025.
New Zealand blackcurrant (NZBC) extract increased 16.1 km cycling time trial performance. The aim of the present study was to examine the effect of NZBC extract on 2 × 4 km time trial performance. Ten male cyclists (age: 30 ± 12 years, body mass: 74 ± 9 kg, height: 179 ± 7 cm, body fat: 11 ± 3%, (V̇) ̇O2max: 55 ± 7 mL•kg-1•min-1, mean ± SD) volunteered. Participants were familiarized with the time trials. Participants consumed capsulated NZBC extract (300 mg∙day-1 CurraNZ™; containing 105 mg anthocyanin) or placebo for seven days (double blind, randomised, cross-over design, wash-out at least seven days) before 2 × 4 km time trials (10 min active self-paced recovery between trials) (SRM ergometer, SRM International, Germany). Heart rate was recorded and blood lactate sampled immediately after each trial and 8 min into recovery between the trials. Times over comparable one km distances in each 4 km time trial were similar. No effect was observed for the time to complete the first (placebo: 380 ± 28 s, NZBC: 377 ± 27 s) and second 4 km of cycling (placebo: 391 ± 32 s, NZBC: 387 ± 30 s), within both groups the second 4 km times slower by 11 ± 8 s and 11 ± 9 s for placebo and NZBC, respectively. However, the total time of the two 4 km cycling trials was 0.82% faster with NZBC extract (placebo: 771 ± 60 s, NZBC 764 ± 56 s, p = 0.034) with seven participants having faster total times. There was no effect of NZBC on heart rate and lactate values at identical time points. New Zealand blackcurrant extract seems to be beneficial in repeated short-distance cycling time trials for overall performance.
新西兰黑加仑（NZBC）提取物可提高16.1公里自行车计时赛成绩。本研究旨在考察NZBC提取物对2×4公里计时赛成绩的影响。十名男性自行车运动员（年龄：30±12岁，体重：74±9公斤，身高：179±7厘米，体脂率：11±3%，最大摄氧量：55±7毫升·千克⁻¹·分钟⁻¹，均值±标准差）自愿参与。参与者熟悉了计时赛流程。在进行2×4公里计时赛（两次计时赛之间有10分钟主动自行恢复时间）（使用德国SRM国际公司的SRM功率计）之前，参与者服用胶囊装的NZBC提取物（300毫克/天的CurraNZ™；含105毫克花青素）或安慰剂，为期七天（双盲、随机、交叉设计，洗脱期至少七天）。每次计时赛后立即记录心率，并在两次计时赛之间的恢复过程中8分钟时采集血乳酸样本。每次4公里计时赛中可比的一公里距离的用时相似。在两组中，完成第一段4公里骑行（安慰剂组：380±28秒，NZBC组：377±27秒）和第二段4公里骑行（安慰剂组：391±32秒，NZBC组：387±30秒）的用时均未观察到影响，安慰剂组和NZBC组第二段4公里用时分别比第一段慢11±8秒和11±9秒。然而，服用NZBC提取物后，两次4公里自行车计时赛的总用时快了0.82%（安慰剂组：771±60秒，NZBC组：764±56秒，p = 0.034），七名参与者的总用时更快。在相同时间点，NZBC对心率和乳酸值没有影响。新西兰黑加仑提取物似乎对重复短距离自行车计时赛的整体表现有益。
