. . . Published ahead of Print Medicine & Science in Sports & Exercise ® Published ahead of Print contains articles in unedited manuscript form that have been peer reviewed and accepted for publication. This manuscript will undergo copyediting, page composition, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered that could affect the content. Copyright © 2018 American College of Sports Medicine Physiological Responses to Overdressing and Exercise-Heat Stress in Trained Runners Brett R. Ely 1 , Laurie A. Blanchard 2 , Jared R. Steele 1 , Michael A. Francisco 1 , Samuel N. Cheuvront 2 , and Christopher T. Minson 1 1 University of Oregon Department of Human Physiology, Eugene, OR 2 United States Army Research Institute of Environmental Medicine, Natick, MA Accepted for Publication: 1 December 2017 ACCEPTED