Exercise training reduces sympathetic nerve activity in heart failure patients treated with carvedilol - Fraga, R; Franco, F G; Roveda, F; de Matos, L N; Braga, A M; Rondon, M U; Rotta, D R; Brum, P C; Barretto, A C; Middlekauff, H R; Negrao, C E (Eur J Heart Fail, 2007)