Blood Flow Restricted Resistance Exercises Versus Low Level Laser on Cardiac Functions in Patients With Chronic Heart Failure

Inclusion Criteria: * Sixty male and female patients diagnosed with chronic heart failure since six months with LVEF\<40%. * They are functionally classified as class II according to New York Heart Association (NYHA). * Their age will be ranged from 40 to 60 years old. * Their BMI will be ranged from 25 to 29.9 kg/m². * They will have good mentality Exclusion Criteria: * Unstable coronary heart disease. * Severe valvular diseases. * Underlying pulmonary disease (aspiration pneumonia, chronic obstructive pulmonary disease, pneumothorax, etc.). * Inability to ambulate owing to physical problems (paresis induced by cerebral stroke, spinal cord injury, amputation, severe pain, dyspnea, etc.). * muskloskletal problems (e.g. severe osteoarthritis or ankylosing spondylitis). * impaired cognitive function (vascular dementia, Alzheimer's dementia, other psychological disease, etc.)