Assessment of functional capacity in clinical and research settings: a scientific statement from the American Heart Association Committee on Exercise, Rehabilitation, and Prevention of the Council on Clinical Cardiology and the Council on Cardiovascular Nursing.
Arena R, Myers J, Williams MA, Gulati M, Kligfield P, Balady GJ, Collins E, Fletcher G, American Heart Association Committee on Exercise, Rehabilitation, and Prevention of the Council on Clinical Cardiology, American Heart Association Council on Cardiovascular Nursing. Circulation. 2007 Jul 17; 116(3):329-43. Epub 2007 Jun 18.