[Electomyographic study of backache--especially on the function of the erector trunci muscle].
D000293:Adolescent; D000328:Adult; D001416:Back Pain / Q000503:physiopathology*; D004576:Electromyography; D006801:Humans; D008297:Male; D011187:Posture; D013122:Spinal Diseases / Q000503:physiopathology