title: EMG activity and force during prone hip extension in individuals with lumbar segmental instability.
abstract: The goal of the current study was to investigate potential differences in back and hip extensor muscle activity and hip extension force during prone hip extension (PHE) in individuals with lumbar segmental instability (LSI) and asymptomatic subjects. Thirty-six subjects with LSI and 26 asymptomatic volunteers participated in this study. Muscle activity of the erector spinae, gluteus maximus, and biceps femoris was recorded using electromyography (EMG), and hip extension force was measured by a digital force gauge. Muscle activity was significantly greater in subjects with LSI than in asymptomatic subjects during PHE (p < 0.05). Hip extension force was significantly lower in the subjects with LSI than in asymptomatic subjects during PHE (p < 0.05). These findings suggest that during PHE, subjects with LSI have differences in back and hip extensor muscle activity and hip extension force compared to asymptomatic individuals.
authors.affiliation: Department of Physical Therapy, Seoul-chuk Hospital, Seoul, Republic of Korea; Department of Physical Therapy, The Graduate School, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do 220-710, Republic of Korea.
authors.forename: Hee-Seok
authors.initials: HS
authors.lastname: Jung
authors.affiliation: Department of Physical Therapy, The Graduate School, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do 220-710, Republic of Korea.
authors.forename: Sun-Young
authors.initials: SY
authors.lastname: Kang
authors.affiliation: Department of Physical Therapy, The Graduate School, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do 220-710, Republic of Korea.
authors.forename: Joo-Hee
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Physical Therapy, College of Health Science, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do, Republic of Korea.
authors.forename: Heon-Seock
authors.initials: HS
authors.lastname: Cynn
authors.affiliation: Department of Physical Therapy, College of Health Science, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do, Republic of Korea. Electronic address: hyeseonj@yonsei.ac.kr.
authors.forename: Hye-Seon
authors.initials: HS
authors.lastname: Jeon
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D015331:Cohort Studies; D004576:Electromyography / Q000379:methods*; D005260:Female; D006621:Hip Joint; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis*; D017116:Low Back Pain / Q000175:diagnosis*; D008159:Lumbar Vertebrae / Q000503:physiopathology*; D008161:Lumbosacral Region; D009119:Muscle Contraction; D016684:Prone Position; D016059:Range of Motion, Articular / Q000502:physiology*; D012016:Reference Values
keywords: Force; Lumbar segmental instability; Muscle activity; Prone hip extension