| Effect | Increase |
| Values | 43.6% increase in TAC (p = 0.000) at the post-exercise timepoint compared to the level at baseline. |
| Trial Design | Randomized trial |
| Trial Length | 24 hours |
| Number of Subjects | 14 |
| Sex | Male |
"The participants ran for an average of 59.2 ± 27.8 min until exhaustion in the placebo group and for 68.4 ± 29.7 min until exhaustion in the grape juice intake group, which was a significantly longer time (p = 0.008). This improvement in physical performance was accompanied by a 43.6% increase in TAC (p = 0.000) at the post-exercise timepoint compared to the level at baseline. MDA, A1GPA, hs-CRP, CK, and LDH did not exhibit changes. In contrast, no significant change in any variable was observed after consuming the placebo drink.
CONCLUSION:
The single-dose intake of purple grape juice demonstrated an ergogenic effect in recreational runners by increasing run time to exhaustion and increasing antioxidant activity."
