Effect of High-intensity Laser Acupuncture on Muscle Performance, Pain and Quality of Life in Low Back Pain

Inclusion Criteria: 1. The patients had CNSLBP with age from 20 to 40 years from both genders. 2. Patients will be referred from an orthopedist with diagnosis of chronic low back pain without underlying pathological causes. 3. The patients with chronic nonspecific low back pain more than 3months. Minimum pain intensity of 30 mm on the visual analogue scale (VAS) for pain, which ranges from 0 to 100 mm. 4. Patients with normal BMI ranges between 18.5:24.9 kg/m2. 5. The study populations must be willing to participate in the study Exclusion Criteria: 1. Neurological, infectious diseases and systemic illness such as rheumatologic diseases,systemic lupus erythematosus, diabetes mellitus type I or II. 2. Psychiatric/mental deficit. 3. Patients who had a previous surgical history (within 6 months) will also excluded. 4. participation in other treatment within the previous 3 month. 5. Pregnancy. 6. History of spinal fracture, tumor, osteoporosis 7. use of medication, such as corticosteroids, anticonvulsants, and antiinflammatory drugs that may affect the outcome of the study. 8. prior history of adverse effects to physical stimulation therapy. 9. significant physical or mental deficiencies preventing a clear understanding of the study procedure. 10. spinal stenosis, thyroid dysfunctions, obesity, pace-maker.