Journal
SPORTS
Volume 5, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/sports5030069
Keywords
football; running sprints; fatigue; elite athletes; anthocyanins; polyphenols
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It was observed previously that New Zealand blackcurrant (NZBC) extract reduced slowing of the maximal 15 m sprint speed during the Loughborough Intermittent Shuttle Test. We examined the effect of NZBC extract on the performance of the Running Based Anaerobic Sprint Test (RAST, 6 x 35-m sprints with 10 seconds passive recovery) in trained youth and recreationally active football players. Fifteen recreationally active (University team) (age: 20 +/- 1 years, height: 174 +/- 19 cm, body mass: 80 +/- 13 kg) and nine trained youth players (English professional club) (age: 17 +/- 0 years, height: 178 +/- 8 cm, body mass: 69 +/- 9 kg, mean +/- SD) participated in three testing sessions. Prior to the RASTs, participants consumed two capsules of NZBC extract (600 mg.day(-1) CurraNZ((R))) or placebo (P) for 7 days (double blind, randomised, cross-over design, wash-out at least 14 days). Ability difference between groups was shown by sprint 1 time. In the placebo condition, trained youth players had faster times for sprint 1 (5.00 +/- 0.05 s) than recreationally active players (5.42 +/- 0.08 s) (p < 0.01). In trained youth players, there was a trend for an effect of NZBC extract (p = 0.10) on the slowing of the sprint 1 time. NZBC extract reduced slowing of the sprint 5 time (P: 0.56 +/- 0.22 s; NZBC: 0.35 +/- 0.25, p = 0.02) and this was not observed in recreationally active players (P: 0.57 +/- 0.48 s; NZBC: 0.56 +/- 0.33, p = 0.90). For fatigue index, expressed as a % change in fastest sprint time, there was a strong trend to be lower in both trained youth and recreationally active players combined by NZBC extract (P: -13 +/- 7%; NZBC: -11 +/- 6%, p = 0.06) with 12 participants (five trained youth) experiencing less fatigue. New Zealand blackcurrant extract seems to benefit repeated sprint performance only in trained football players.
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