Inclusion Criteria:  . chronic heart failure (≥ 1 year) .Respiratory muscle weakness≤ 70% of their predicted MIP.  Ages ranged from 45-65 years old Left ventricle ejection fraction ≤ 40% in NYHA class II and III .In stable condition (No rales on auscultation or tibial edema and with sinus rhythm). On standard cardiac medications (diuretics, angiotensin-converting enzyme (ACE) inhibitors, and glycosides) Not engaged in any regular physical training program for at least one month before the start of the study.  Exclusion Criteria:  Chronic lung disorders,  Anemia Severe hypoxia History of myocardial infarction or pulmonary edema six months before the study Severe uncontrolled hypertension, or uncontrolled diabetes mellitus or autonomic disorders