• Mitsuhiro Masaki, Hiroshige Tateuchi, Yumiko Koyama, Kaoru Sakuma, Naoki Otsuka, and Noriaki Ichihashi.
• Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, 1398 Shimami-cho, Kita-ku, Niigata, 950-3198, Japan; Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, 1398 Shimami-cho, Kita-ku, Niigata, 950-3198, Japan. Electronic address: masaki@nuhw.ac.jp.
• Gait Posture. 2018 Oct 1; 66: 221-227.

BackgroundQuadruped upper and lower extremity lift (QULEL) is performed for selective training of the lumbar multifidus muscle in patients with low back pain (LBP) or individuals with LBP history (LBPH). However, the activities of the back muscles and sagittal spinal alignment during QULEL are not clarified in individuals with LBPH.Research QuestionThis study aimed to analyze the activities of the back muscles and sagittal spinal alignment during QULEL in young male with LBPH.MethodsThe study comprised 9 asymptomatic young men and 8 young men with LBPH. The activities of the lumbar multifidus, latissimus dorsi and thoracic erector spinae, and lumbar erector spinae muscles were measured using surface electromyography. The flexion angles of the upper and lower thoracic spine, and extension angle of the lumbar spine were measured using a 6-DF electromagnetic motion tracking system. The association with LBPH was investigated using multiple logistic regression analysis with a forward selection method, with the activities of the back muscles, sagittal spinal alignment, age, body height, and body weight as independent variables.ResultsMultiple logistic regression analysis (p = 0.0002) showed that the activity of the latissimus dorsi and thoracic erector spinae muscles in the side on which the lower extremity was lifted and body height were significant and independent determinants of LBPH, but other factors were not.SignificanceThe results of this study suggest that the activity of the latissimus dorsi and thoracic erector spinae muscles increases while there are no decrease in activity of the lumbar multifidus muscle and excessive extension of the lumbar spine during QULEL in young men with LBPH.Copyright © 2018 Elsevier B.V. All rights reserved.

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