1 Sprint Training Improves Contractility in Postinfarction Rat Myocytes: Role of Na + /Ca 2+ Exchange Jianliang Song 1 , Xue-Qian Zhang 1 , JuFang Wang 1 , Lois L. Carl 1 , Belinda A Ahlers 1 , Lawrence I. Rothblum 1 , and Joseph Y. Cheung 1,2 1 Weis Center for Research and 2 Department of Medicine Geisinger Medical Center, Danville, PA 17822 Address Correspondence To: Joseph Y. Cheung, M.D., Ph.D. Weis Center for Research Geisinger Medical Center Danville, PA 17822-2619 Tel. 570-271-7013 Fax. 570-271-6701 Email: jcheung@geisinger.edu Running Title: exercise training, myocardial infarction, and Na + /Ca 2+ exchange Articles in PresS. J Appl Physiol (April 9, 2004). 10.1152/japplphysiol.00061.2004 Copyright © 2004 by the American Physiological Society.