title: Chronic Low Back Pain in Women: Muscle Activation during Task Performance.
abstract: [Purpose] The aim of this study was to compare the activities of the trunk and hip muscles in chronic low back pain (CLBP) women and asymptomatic subjects during the kneeling to half-kneeling task. [Subjects] Twenty-nine CLBP women and thirty asymptomatic subjects (C) participated in this study. [Methods] Electromyography activity (EMG) of the obliquus internus abdominis (OI), the lumbar erector spinae (LES) and the gluteus medius (GM) muscles was recorded bilaterally. The peak amplitude, the time of peak amplitude and the integrated linear envelope EMG for each muscle were obtained. [Results] The C group bilateral OI and GM muscles displayed higher peak amplitudes and earlier times of peak amplitude. They also had higher integrated linear envelope EMG values. The CLBP group bilateral LES muscles had higher peak amplitudes and earlier times of peak amplitude. They also showed an increased integrated linear envelope EMG values. [Conclusion] The CLBP women activate the LES muscles in the kneeling to half-kneeling task, showing different patterns of motor planning activity.
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: Fernanda G
authors.initials: FG
authors.lastname: Santos
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: Carolina M
authors.initials: CM
authors.lastname: Carmo
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: América C
authors.initials: AC
authors.lastname: Fracini
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: Rita R P
authors.initials: RR
authors.lastname: Pereira
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: Kelly S
authors.initials: KS
authors.lastname: Takara
authors.affiliation: Department of Physiotherapy, Communication Science and Disorders, Occupational Therapy, Faculty of Medicine, University of São Paulo, Brazil.
authors.forename: Clarice
authors.initials: C
authors.lastname: Tanaka
keywords: Abdominal muscles; Low back pain; Postural balance