title: Muscle activation and movement patterns during prone hip extension exercise in women.
abstract: BACKGROUND
  The consistency of muscle activation order during prone hip extension has been debated.
  
  
  OBJECTIVE
  To investigate whether women use a consistent and distinguishable muscle activation order when extending the hip while prone and to explore the effects of verbal cues on muscle activation and movement.
  
  
  METHODS
  Single-session, repeated-measures design.
  
  
  METHODS
  University laboratory.
  
  
  METHODS
  Eleven healthy women (age = 27.7 +/- 6.2 years [range, 22-37 years]).
  
  
  METHODS
  We tested the participants under 3 conditions: no cues, cues to contract the gluteal muscles, and cues to contract the hamstrings muscles.
  
  
  METHODS
  We measured hip and knee angle and electromyographic data from the gluteus maximus, medial hamstrings, and lateral hamstrings while participants performed prone hip extension from 30 degrees of hip flexion to neutral.
  
  
  RESULTS
  When not given cues, participants used the consistent and distinguishable muscle activation order of medial hamstrings, followed by lateral hamstrings, then gluteus maximus (195.5 +/- 74.9, 100.2 +/- 70.3, and 11.5 +/- 81.9 milliseconds preceding start of movement, respectively). Compared with the no-cues condition, the gluteal-cues condition resulted in nearly simultaneous onset of medial hamstrings, lateral hamstrings, and gluteus maximus (131.3 +/- 84.0, 38.8 +/- 96.9, and 45.1 +/- 93.4 milliseconds, respectively) (P > .059); decreased activation of the medial hamstrings (P < .03) and lateral hamstrings (P < .024) around the initiation of movement; increased activation of gluteus maximus throughout the movement (P < .001); and decreased knee flexion (P = .002). Compared with the no-cues condition, the hamstrings-cues condition resulted in decreased activation of the medial hamstrings just after the initiation of movement (P = .028) and throughout the movement (P = .034) and resulted in decreased knee flexion (P = .003).
  
  
  CONCLUSIONS
  Our results support the contention that the muscle activation order during prone hip extension is consistent in healthy women and demonstrates that muscle timing and activation amplitude and movement can be modified with verbal cues. This information is important for clinicians using prone hip extension as either an evaluation tool or a rehabilitation exercise.
authors.affiliation: Human Neuromechanics Laboratory, Division of Kinesiology, University of Michigan, 401 Washtenaw Avenue, Ann Arbor, MI 48109-2214, USA. caralew@umich.edu
authors.forename: Cara L
authors.initials: CL
authors.lastname: Lewis
authors.forename: Shirley A
authors.initials: SA
authors.lastname: Sahrmann