Basal (nonstimulated) oxidative stress levels. To estimate the effect
that changes in oxidative resistance capacity conferred to oxidative
damage under basal conditions, urinary excretion of oxidatively
modified protein, DNA, RNA, and lipids were measured. Study
participants collected a first-morning voided urine sample on each of
the last 5 d of each 14-d intervention. They were asked to refrain from
any vigorous exertion during this period. The 5 individual urine samples
from the respective collection period (placebo or tart cherry juice) were
pooled by mixing an equal amount from each daily sample. The pooled
sample was then aliquoted and stored at 2208C until analyses.