Baduanjin for precise rehabilitation of chronic nonspecific low back pain based on surface emG optimization:A Multi-center randomized controlled study

INTERVENTION: Experimental group:The Department of Rehabilitation Medicine of Xiyuan Hospital targets the low back pain version of Baduanjin;control group:The State General Administration of Sport edition of the Baduanjin group; CONDITION: Chronic nonspecific low back pain(CNLBP) PRIMARY OUTCOME: Quebec Baclain Disability Scale (QBPDS); SECONDARY OUTCOME: Lumbar joint range of motion;Lumbar MRI;surface myoelectricity; INCLUSION CRITERIA: 1. Clinical diagnostic criteria: (1) Pain at the site of onset, mostly soreness and discomfort, muscle stiffness and stagnation, or a sense of heavy pressure, falling, waist sinking. Symptoms worsen in the morning or after weather changes and colds, but the pain is reduced after activity, and often recurrent attacks. Bending down to work is difficult, bending over a little longer will aggravate the pain, often like to use both hands to beat the waist to reduce the pain. (2) Physical examination: there is no abnormality in the shape of the waist, and the pitching activity is more barrier‐free. Sometimes the muscular fascia is tight, and a few patients have a slightly limited lumbar movement and tenderness, mostly at the sacral spinous muscle, at the sacral spinous muscle stop point behind the sacrum, or at the posterior part of the iliac crest, the lumbar transverse process, the space between the spines, or the supracanthin ligament. (3) Pe