Interventions - Participants underwent hemodialysis sitting in a reclining chair. They trained on an Equimond© mechanically braked cycle ergometer, which we positioned and stabilized in front of the participants while they sit in their chairs during hemodialysis. The training is performed in the first 2 hours of hemodialysis, with a total exercise time of 60 minutes. Each exercise period of 20 minutes is separated by 10 minutes of rest. The patients are advised to work with a level of perceived exertion of 'somewhat strong' (13-14 of Borg scale). For safety, heart rate and blood pressure is monitored throughout the session. The training is terminated if the patients exceeded 80% of their maximum heart rate (MHR = 220 - age in years), blood pressure parameters are exceeded (above 200/110 or below 110/50mmHg) or the patient had chest pain, severe dyspnea, wheezing, leg cramps, confusion, visual symptoms, pallor or cyanosis. Training is conducted by physiotherapists.