Here's the actual study
The results of this are pretty shocking and there's no reason to believe that it has anything to do with the fact that the Vitamin C/E were administered via vitamins rather than foods.
Fortunately, at the dosages they administered, 1000% DV of vitamin C and 400 IU of vitamin E, you'd have to eat a rather large amount of peppers/oranges/etc. to match the vitamin C levels and an absurd amount of avacados/almonds/etc. to match the vitamin E levels.
Nonetheless, the results were significant and should give pause to any athlete that is currently taking multivitamin supplements with large amounts of antioxidants.