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Related Experiment Videos

Human trunk strength profile in flexion and extension

S Kumar1, R M Dufresne, T Van Schoor

  • 1University of Alberta, Edmonton, Canada.

Spine
|January 15, 1995
PubMed
Summary

This study measured trunk flexion-extension strength in various postures. Posture significantly impacts strength, with females exhibiting lower strength than males, informing rehabilitation strategies for low back pain patients.

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Area of Science:

  • Biomechanics
  • Musculoskeletal Physiology
  • Rehabilitation Science

Background:

  • Limited data exists on trunk flexion-extension strength variations with standardized postural changes.
  • The impact of postural deviations on flexion-extension strength ratios is not well understood.

Purpose of the Study:

  • To establish a normative database for isometric and isokinetic trunk strength across different flexion angles.
  • To quantify strength deficits in patients with idiopathic low back pain.

Main Methods:

  • Utilized a custom-designed flexion-extension-lateral flexion tester (FELT).
  • Measured isometric and isokinetic trunk flexion-extension strength in 73 healthy subjects (males and females) and 10 low back pain patients.
  • Assessed strength at various trunk flexion angles (0, 20, 40, 60 degrees).

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Main Results:

  • Isokinetic strength was 60-70% of isometric strength; female strength was 60-70% of male strength.
  • Trunk posture significantly influenced strength (ANOVA).
  • Multiple regression models explained 73% of isometric and 34% of isokinetic strength variance.

Conclusions:

  • Trunk strength assessment should occur in postures simulating daily activities for accurate impairment evaluation.
  • Findings provide a basis for developing targeted rehabilitation programs for low back pain.