Abstract
Purpose
Blackcurrant intake increases peripheral blood flow in humans, potentially by anthocyanin-induced vasodilation which may affect substrate delivery and exercise performance. We examined the effects of New Zealand blackcurrant (NZBC) extract on substrate oxidation, cycling time-trial performance and plasma lactate responses following the time-trial in trained cyclists.
Methods
Using a randomized, double-blind, crossover design, 14 healthy men (age: 38 ± 13 years, height: 178 ± 4 cm, body mass: 77 ± 9 kg, \(\dot{V}\)O2max: 53 ± 6 mL kg−1 min−1, mean ± SD) ingested NZBC extract (300 mg day−1 CurraNZ™ containing 105 mg anthocyanin) or placebo (PL, 300 mg microcrystalline cellulose M102) for 7 days (washout 14 days). On day 7, participants performed 30 min of cycling (3 × 10 min at 45, 55 and 65 % \(\dot{V}\)O2max), followed by a 16.1 km time-trial with lactate sampling during a 20-min passive recovery.
Results
NZBC extract increased fat oxidation at 65 % \(\dot{V}\)O2max by 27 % (P
Description
The study investigates how red wine polyphenols affect calcium mobilization in endothelial cells.