1. Health and Exercise-Related Medical Issues among 1,212 Ultramarathon Runners: Baseline Findings from the Ultrarunners Longitudinal TRAcking (ULTRA) Study
by the US National Institute of Health, an An official website of the United States government

2. A Glimpse Into The Health of Ultramarathon Runners.
by Sanford University

3. A Runners Diet
by John Hopkins Medicine