@article{oai:tau.repo.nii.ac.jp:00000144,
 author = {Tejima, Ryota and Tejima, Ryota and Yamaguchi, Tatsuhiko and Fukuda, Yasushi and Koyama, Koji and Yamaguchi, Tatsuhiko and Fukuda, Yasushi and Koyama, Koji},
 journal = {東京有明医療大学雑誌, Journal of Tokyo Ariake University of Medical and Health Sciences},
 month = {Dec},
 note = {In spinal alignment, the posture cannot be maintained only by the bones and ligaments, and trunk rigidity is maintained by the presence of the surrounding trunk muscles. However, there are no reports of spinal alignment and trunk muscles in male high school soccer players. 
Purpose：In this study, we focused on spinal alignment and deep trunk muscles, to clarify the mechanism of low back pain （LBP） in male high school soccer players. Methods : The participants were 90 male high school soccer players. The presence of LBP was evaluated using a questionnaire. We assigned the participants into two groups : the non-LBP group （n = 58） and the LBP group （n = 32）.
Results：Comparing the upright position with spinal alignment, a correlation was found between thoracic kyphotic angle （TKA） and lumbar lordosis angle （LLA） and between LLA and sacral inclination angle （SIA） in the non-LBP group. Conversely, in the LBP group, a correlation was found only between LLA and SIA, and no correlation was found between TKA and LLA. With regard to spinal alignment using the amount of change in the forward and backward bending positions, a correlation was found between LLA and SIA in the non-LBP group. By contrast, in the LBP group, a correlation was found between TKA and LLA, but no correlation was found between LLA and SIA. In addition, compared with the deep trunk muscles, the lumbar multifidus （LM） muscle contraction rate was lower in the LBP group than in the non-LBP group. 
Conclusion：This study suggests that changes in spinal alignment and decreased LM contraction rate may be involved in LBP in male high school soccer players.},
 pages = {1--8},
 title = {Changes in sagittal spinal alignment and comparison of deep trunk muscles contraction rate in low back pain of male high school soccer players},
 volume = {13},
 year = {2021}
}