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You Asked for It: Question Authority

Nieman, David C. Dr.P.H., FACSM

doi: 10.1249/FIT.0b013e3181f8730b
DEPARTMENTS: You Asked For It: Question Authority

I am an avid runner and train 30 to 50 miles per week. So far, I've been running for 20 years and plan to continue as long as I have the motivation. I am worried, though, that my knee joints are "wearing out" and arthritis will set in. Is this likely?

David C. Nieman, Dr.P.H., FACSM, is a professor and director at the Human Performance Laboratory, Appalachian State University, Boone, North Carolina, an active researcher, and author of several textbooks on health and fitness. Send your questions to

© 2010 American College of Sports Medicine.