OBJECTIVE	To compare the effects on maximal exercise tolerance of 12 weeks of four dosages of telmisartan ( 10/20/40 / 80 mg once daily ) , an AT ( 1 ) specific angiotensin II receptor antagonist , or continuation on the angiotensin converting enzyme inhibitor enalapril , in patients with stable , mild-to-moderate congestive heart failure ( NYHA Class II and III and left ventricular ejection fraction < or = 40 % ) .\