title: Analysis of muscle activity during active pelvic tilting in sagittal plane.
abstract: BACKGROUND
  Pelvic tilting is performed to improve lumbopelvic flexibility or retrain the motor control of local muscles. However, few studies investigated the activity of local muscles during pelvic tilting.
  
  
  OBJECTIVE
  The purpose of this study was to investigate muscle activity during anterior and posterior pelvic tilting.
  
  
  METHODS
  Twelve healthy males (age, 22.6 ± 1.4 years) participated. Fine-wire electrodes were inserted into the bilateral lumbar multifidus (MF) and transversus abdominis (TrA). Surface electrodes were used to record activity of the bilateral rectus abdominis, external oblique, and erector spinae (ES), and the unilateral right latissimus dorsi, gluteus maximus, semitendinosus, and rectus femoris muscles. The electromyographic activities during anterior and posterior pelvic tilting in a standing position were recorded and expressed as a percentage of the maximum voluntary contraction (%MVC) for each muscle.
  
  
  RESULTS
  The activities of the bilateral MF (right: 23.9 ± 15.9 %MVC, left: 23.9 ± 15.1 %MVC) and right ES (19.0 ± 13.3 %MVC) were significantly greater than those of the other muscles during anterior pelvic tilting. The activity of the left TrA (14.8 ± 16.4 %MVC) was significantly greater than that of the other muscles during posterior pelvic tilting.
  
  
  CONCLUSIONS
  The results suggested that the MF and ES are related to anterior pelvic tilting. The activity of the TrA, which was classified as a local muscle, was greater during posterior pelvic tilting. This study indicated that local muscles such as the MF and TrA may be related to pelvic tilting.
authors.affiliation: Department of Sports Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba; Sports Research and Development Core, University of Tsukuba.
authors.forename: Sho
authors.initials: S
authors.lastname: Takaki
authors.affiliation: Faculty of Sports Sciences, Waseda University.
authors.forename: Koji
authors.initials: K
authors.lastname: Kaneoka
authors.affiliation: Faculty of Health and Medical Care, Saitama Medical University.
authors.forename: Yu
authors.initials: Y
authors.lastname: Okubo
authors.affiliation: Graduate School of Sport Sciences, Waseda University.
authors.forename: Satoru
authors.initials: S
authors.lastname: Otsuka
authors.affiliation: Department of Orthopaedic Surgery, University of Tsukuba Mito Kyodo General Hospital, Mito Area Medical Education Center.
authors.forename: Masaki
authors.initials: M
authors.lastname: Tatsumura
authors.affiliation: Department of Orthopaedic Surgery, Moriya Daiichi General Hospital.
authors.forename: Itsuo
authors.initials: I
authors.lastname: Shiina
authors.affiliation: Faculty of Health and Sport Sciences, University of Tsukuba.
authors.forename: Shumpei
authors.initials: S
authors.lastname: Miyakawa
keywords: EMG; Local muscle; Pelvic tilting; Wire electrodes