 The body produces a natural compound, nitric oxide NO, which is known to improve the elasticity of blood vessels effect cardiac function and play a role in the remodeling process after a heart attack. The primary source of NO is one of the amino acids that the body uses to form new proteins, L-Arginine; although many individuals with heart disease also take medicines to increase the concentrations of NO such as nitroglycerine. The VINTAGE-MI trial is intended to investigate wether supplementation of the bodies supply of NO with oral administration of L-Arginine will improve the functional recovery of older patients who have recently suffered their first heart attack. 