Competitive long-distance runners can improve their race times if they live at high altitudes but train at low altitudes, a five-year study by researchers at UT Southwestern Medical Center at Dallas concludes. The study represents the most comprehensive study of altitude training to date and was supported in part by grants from the U.S. Olympic Committee and USA Track and Field. Dr. Benjamin Levine and Dr. James Stray-Gundersen published their results, "Living High-Training Low: Moderate-Altitude Acclimatization With Low-Altitude Training and Effect on Sea-Level Performance," in the July issue of the Journal of Applied Physiology.