Prevalence and Factors Associated With Sarcopenia in Pre-retirement Aged Adults With Chronic Non-specific Lower Back Pain

Inclusion Criteria: 1. Be a person between the ages of 50 - 59 years with or without chronic lower back pain longer than 3 months, but without any dangerous signs of lower back pain, sciatica pain, and neurological disorder. 2. Be able to walk continuously for at least 10 minutes. 3. Give written consent to join the research project. Exclusion Criteria: 1. Have a history of spinal fracture, spondylolisthesis, scoliosis, or osteomyelitis. 2. Have a neurological disorder or myasthenia gravis. 3. Have a congenital disease such as acute coronary syndrome, cancer, or severe muscular or joint disease that affects the ability to walk continuously for at least 10 meters. 4. Be implanted with a pacemaker or electrical device. 5. Refuse or withdraw from the study.