Effects of training on systolic time intervals at rest and during isometric exercise in men and women 61 to 64 years old.
Seals DR, Hurley BF, Hagberg JM, Schultz J, Linder BJ, Natter L, Ehsani AA. Effects of training on systolic time intervals at rest and during isometric exercise in men and women 61 to 64 years old. Am J Cardiol. 1985 Mar 01; 55(6):797-800.