title: Analysis of electromyographic activities of the lumbar erector spinae caused by inversion traction.
abstract: [Purpose] The purpose of this study was to analyze changes in the electromyographic activities of the lumbar erector spinae caused by inversion traction in order to verify the relaxation effect. [Subjects and Methods] The subjects included 60 healthy male adults who were equally and randomly assigned to a 30-30° group, a 30-60° group, and a 60-60° group. Inversion traction was performed for six minutes, and the electromyographic activities of the lumbar erector spinae (L2, L4) were measured before and after inversion traction. [Results] The root mean square values at the L2 and L4 levels on both sides were statistically significantly higher after inversion traction compared with before inversion traction. Before inversion traction, the root mean square values at the L2 and L4 levels on both sides in the 30-60° group and 60-60° group were significantly higher than those in the 30-30° group, while the root mean square values at the L2 and L4 levels on both sides showed no significant differences between the groups before inversion traction. [Conclusion] The findings of this study indicated that IT is more likely to elicits an increase in muscle tension and prevent relaxation of the lumbar erector spinae.
authors.affiliation: Department of Physical Therapy, Graduate School of Catholic University of Pusan, Republic of Korea.
authors.forename: Chung Yoo
authors.initials: CY
authors.lastname: Kim
authors.affiliation: Department of Physical Therapy, College of Health Sciences, Catholic University of Pusan, Republic of Korea.
authors.forename: Jong Ho
authors.initials: JH
authors.lastname: Kang
keywords: Inversion traction (IT); Muscle tension; Traction angle