 This work aimed to evaluate the effects of a moderate aerobic exercise with controlled intensity determined by Cardiopulmonary Exercise Testing CPET and its role on the functional status in ALS patients versus standard care. Additionally, the investigators explored the performance of CPET variables - oxygen uptake VO2 expressed in Lmin, in percentage of predicted or in metabolic equivalents METs at peak effort, at anaerobic threshold AT, the respiratory compensation point RCP when achieved, Dioxide Carbon output in Lmin VCO2 and the minute ventilation in Lmin VE throughout the study. 