EMG Activity and Force During Prone Hip Extension in Individuals with Lumbar Segmental Instability

By Alex Howard PT, DPT, CSCS

Edited by Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, ACSM H/FS

Original Citation: Jung, H., Kang, S., Park, J., Cynn, H., & Jeon, H., (2015). EMG activity and force during prone hip extension in individuals with lumbar segmental instability. Manual Therapy, 20(3), 440-444. ABSTRACT

Why is this relevant?:

Lumbar segment instability (LSI), due to mechanical and functional impairment, is a common source of low back pain (LBP).  Optimal activity and coordination between lumbar extensor and hip extensor muscles is necessary for lumbo pelvic stabilization and optimal motion during hip extension.  This study compares hip extension force, lumbar erector and posterior hip muscle activity during prone hip extension (PHE), in individuals with and without LSI.

Dr. Brent Brookbush instructs Personal Trainer, Laura DeAngelis on proper form for the Quadruped Opposite Arm Leg Raise (Transverse Abdominis Activation) Quadruped Opposite Arm and Leg Raise - Transverse Abdominis Activation (TVA)

Study Summary

Study Design Cross Sectional Study
Level of Evidence IV - Evidence from well-designed case control or cohort study
Subject Demographics

Characteristics: matched control subjects

    • Gender: female
    • Age: 26 (+ 5 years)
    • Weight (+ 3 kg)
    • height (+ 3 kg)

LSI Individuals (120 recruited from orthopedic clinic)

  • Inclusion Criteria: non radicular central low back pain (LBP) > 3 months, combination of >3cm slip and translation on plain radiograph, degenerative disc disease on MRI, (+) for both clinical tests
  • Exclusion Criteria: negative concordant pain with discography, slip < 3 cm, translation < 3 cm, (-) both clinical tests, inability to perform hip extension, (+) Thomas test, history of fracture or surgery at lumbar spine or hip joint, structural deformities or neurological disorders, significant weakness in hip muscles
  • Final Inclusion: 36 individuals

Asymptotic individuals (54 recruited from orthopedic clinic)

  • Inclusion Criteria: no history of LBP in previous 12 months
  • Exclusion