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Properties of Paraspinal Muscles in Japanese High School Baseball Players With Terminal‐Stage Lumbar Spondylolysis
Author(s) -
Tsuboi Hiroyuki,
Nishimura Yukihide,
Sakata Takeshi,
Tanina Hideaki,
Arakawa Hideki,
Nakamura Takeshi,
Umezu Yuichi,
Tajima Fumihiro
Publication year - 2018
Publication title -
pmandr
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.617
H-Index - 66
eISSN - 1934-1563
pISSN - 1934-1482
DOI - 10.1016/j.pmrj.2017.06.018
Subject(s) - spondylolysis , pars interarticularis , medicine , lumbar , erector spinae muscles , trunk , athletes , multifidus muscle , physical therapy , low back pain , physical medicine and rehabilitation , anatomy , spondylolisthesis , ecology , alternative medicine , pathology , biology
Background Lumbar spondylolysis is a defect in the pars interarticularis that is common in young athletes; the stress distribution at the pars interarticularis is the highest in extension and rotation movements. The paraspinal muscles play an important role in stabilization of the lumbar spine; however, no study has assessed the properties of paraspinal muscles in athletes with lumbar spondylolysis. Objective To evaluate the properties of paraspinal muscles in athletes with lumbar spondylolysis. Design Cross‐sectional study. Setting Laboratory. Participants Six high school baseball players with terminal‐stage lumbar spondylolysis and 11 high school baseball players without organic lumbar lesions of similar anthropometric characteristics. Methods All subjects performed the unsupported trunk holding test combined with surface electromyographic (EMG) power spectral analysis until exhaustion. The results of EMG power spectral analysis were compared between the spondylolysis and control groups. Main Outcome Measurements The median frequency (MF) was computed from the raw EMG signal of the erector spinae and multifidus during trunk holding test using fast Fourier transform spectrum analysis. The initial MF and MF slope were calculated. Results No significant differences in endurance time were found between the spondylolysis and control groups. The initial MF and the MF slopes of the erector spinae and multifidus were significantly lower in the spondylolysis group than in the control group. Conclusions The results suggest lower fast‐twitch motor unit recruitment in the erector spinae and multifidus of high school baseball players with terminal‐stage lumbar spondylolysis compared with the control. Level of Evidence IV