title: Effect of abdominal drawing-in maneuver during hip extension on the muscle onset time of gluteus maximus, hamstring, and lumbar erector spinae in subjects with hyperlordotic lumbar angle.
abstract: BACKGROUND
  The abdominal drawing-in maneuver (ADIM) is used to prevent abnormal movements of the lumbar spine and pelvis during therapeutic exercises. This study compared the effects of ADIM on the muscle onset time of the hamstring, gluteus maximus, and erector spinae muscles during prone hip extension exercise in subjects with or without hyperlordotic lumbar angle. Forty healthy adults (18 male, 22 female) were recruited for this study.
  
  
  METHODS
  The lumbar lordotic angles and pelvic tilt angles of the subjects were measured using the Avaliação postural analysis software. The subjects were divided into two groups: the lumbar hyperlordotic angle (LHLA) and lumbar normal lordotic angle (LNLA) groups. The muscle contraction onset time of the hamstring, gluteus maximus, and erector spinae were assessed using surface electromyography.
  
  
  RESULTS
  During ADIM application, the muscle contraction onset time of the gluteus maximus was significantly increased in the LHLA group compared with the LNLA group.
  
  
  CONCLUSIONS
  ADIM application during prone hip extension was more effective for gluteus maximus onset time in the LHLA group. Therefore, ADIM during prone hip extension may be useful for gluteus maximus training in individuals with lumbar hyperlordosis.
authors.forename: Taewoo
authors.initials: T
authors.lastname: Kim
authors.forename: Youngkeun
authors.initials: Y
authors.lastname: Woo
authors.affiliation: Department of Physical Therapy, College of Medical Sciences, Jeonju University, 303 Cheonjam-ro, Wansan-gu, Jeonju, Jeonbuk-do 560-759, Korea Republic. ptkim@jj.ac.kr.
authors.forename: Yongwook
authors.initials: Y
authors.lastname: Kim
mesh_terms: D000005:Abdomen / Q000502:physiology*; D000328:Adult; D004576:Electromyography; D005260:Female; D006615:Hip / Q000502:physiology*; D006801:Humans; D008161:Lumbosacral Region / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology; D055815:Young Adult