title: Individuals with chronic low back pain demonstrate delayed onset of the back muscle activity during prone hip extension.
abstract: Prone hip extension (PHE) is commonly used in the evaluation of the stability of the lumbopelvic region. There is little evidence of difference in muscle activity onset timing between healthy individuals and individuals with chronic low back pain (CLBP) during PHE. The purpose of this study was to determine if individuals with and without CLBP differ in the onset time of the trunk and hip extensor muscles activity during PHE. The participants were 20 patients with CLBP and 20 healthy individuals. Electromyography data of the erector spinae, multifidus, gluteus maximus, and semitendinosus were collected during PHE using a surface electromyograph. Relative differences in the onset times between each muscle and the prime mover (i.e., the semitendinosus) were calculated. The onsets of the bilateral multifidus and contralateral erector spinae were significantly delayed in the CLBP group compared with the healthy group (p<0.001), despite the onset timings of leg movement not being significantly different between the groups. The onset times of the gluteus maximus and ipsilateral erector spinae showed no significant differences between the groups. These results suggest that individuals with CLBP use an altered, and possibly inadequate, trunk muscle recruitment pattern.
authors.affiliation: Graduate School of Health Sciences, Kibi International University, 8 Iga-machi, Takahashi City 716-8508, Japan; Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan. Electronic address: suehiro@mw.kawasaki-m.ac.jp.
authors.forename: Tadanobu
authors.initials: T
authors.lastname: Suehiro
authors.affiliation: Graduate School of Health Sciences, Kibi International University, 8 Iga-machi, Takahashi City 716-8508, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Mizutani
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ishida
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kobara
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Osaka
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288, Matsushima, Kurashiki City 701-0193, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Watanabe
mesh_terms: D000328:Adult; D064131:Back Muscles / Q000503:physiopathology*; D059350:Chronic Pain / Q000175:diagnosis / Q000503:physiopathology*; D004576:Electromyography / Q000379:methods; D005260:Female; D006615:Hip / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D017116:Low Back Pain / Q000175:diagnosis / Q000503:physiopathology*; D008297:Male; D010865:Pilot Projects; D016684:Prone Position / Q000502:physiology*; D055815:Young Adult
keywords: Back muscle; Chronic low back pain; Lumbopelvic stability; Muscle activity onset time; Prone hip extension