Detection of autonomic dysfunction in hemodialysis patients using the exercise treadmill test: the role of the chronotropic index, heart rate recovery, and R-R variability. oleh Maria Angela M Q Carreira, André B Nogueira, Felipe M Pena, Marcio G Kiuchi, Ronaldo C Rodrigues, Rodrigo R Rodrigues, Jorge P S Matos, Jocemir R Lugon