title: Comparison of Hip- and Back-Muscle Activity and Pelvic Compensation in Healthy Subjects During 3 Different Prone Table Hip-Extension Exercises.
abstract: BACKGROUND
  Prone hip extension has been recommended for strengthening the back and hip muscles. Previous studies have investigated prone hip extension conducted with subjects on the floor in the prone position. However, no study has compared 3 different table hip-extension (THE) positions in terms of the activities of the back- and hip-joint muscles with lumbopelvic motion.
  
  
  OBJECTIVE
  To identify more effective exercises for strengthening the gluteus maximus (GM) by comparing 3 different exercises (THE alone, THE with the abdominal drawing-in maneuver [THEA], and THEA with chair support under the knee [THEAC]) based on electromyographic muscle activity and pelvic compensation.
  
  
  METHODS
  Repeated-measure within-subject intervention.
  
  
  METHODS
  University research laboratory.
  
  
  METHODS
  16 healthy men.
  
  
  METHODS
  Surface electromyography (EMG) was used to obtain data on the GM, erector spinae (ES), multifidus, biceps femoris (BF), and semitendinosus (ST). Pelvic compensation was monitored using an electromagnetic motion-tracking device. Exertion during each exercise was recorded. Any significant difference in electromyographic muscle activity and pelvic motion among the 3 conditions (THE vs THEA vs THEAC) was assessed using a 1-way repeated-measures analysis of variance (ANOVA) with Bonferroni post hoc test.
  
  
  RESULTS
  The muscle activities recorded by EMG differed significantly among the 3 exercises (P < .01). GM activity was increased significantly during THEAC (P < .01). There was a significant difference in lumbopelvic kinematics in terms of anterior tilting (F = 19.49, P < .01) and rotation (F= 27.38, P < .01) among the 3 exercises.
  
  
  CONCLUSIONS
  The THEAC exercise was the most effective for strengthening the GM without overactivity of the ES, BF, and ST muscles and lumbopelvic compensation compared with THE and THEA.
authors.forename: In-Cheol
authors.initials: IC
authors.lastname: Jeon
authors.forename: Oh-Yun
authors.initials: OY
authors.lastname: Kwon
authors.forename: Jong-Hyuck
authors.initials: JH
authors.lastname: Weon
authors.forename: Ui-Jae
authors.initials: UJ
authors.lastname: Hwang
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Jung
mesh_terms: D000328:Adult; D064131:Back Muscles / Q000502:physiology*; D001696:Biomechanical Phenomena; D004576:Electromyography; D005081:Exercise Therapy / Q000379:methods*; D064368:Healthy Volunteers; D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D008297:Male; D010388:Pelvis / Q000502:physiology*; D016684:Prone Position; D055815:Young Adult
keywords: Borg scale of perceived exertion; gluteus maximus; lumbopelvic stability