In the article entitled, “Potential Adverse Cardiovascular Effects From Excessive Endurance Exercise” published in the June 2012 issue of Mayo Clinic Proceedings (Mayo Clin Proc. 2012;87(6):587-595), reference 7 should have read as follows: 7. Lee DC, Pate RR, Lavie CJ, Blair SN. Running and all-cause mortality risk—is more better? Med Sci Sports Exerc 2012;44(5):S699.