Correction: Article on Exercise, Oxidative Stress, and Estrogens

In an article on exercise, oxidative stress, and estrogens in the January 2008 issue (1), an error has been noted. The F2-isoprostanes assay was performed in fasting plasma, not urine. The correct units for this outcome are pg/ml. This correction does not substantively alter the conclusions of the paper but might be important to researchers attempting to compare their levels of urinary F2-isoprostanes to those reported in the article.