Quantification of lumbar function: Part 1: Isometric and multispeed isokinetic trunk strength measures in sagittal and axial planes in normal subjects

Susan S. Smith, Tom G. Mayer, Robert J. Gatchel, Theodore J. Becker

Research output: Contribution to journalArticle

181 Scopus citations

Abstract

The goals of this study were to: (1) evaluate the repeatability of a method of measuring trunk strength; (2) measure isometric and isokinetic strength of trunk flexors, extensors and rotators; (3) explore relationships among these muscle groups; and (4) compare a torque to body weight adjustment measure versus lean body weight. One hundred twenty-five normal subjects (62 males, 63 females) were tested using a Cybex prototype trunk extension-flexion system. Sixty-seven subjects (25 males, 42 females) were tested using a prototype torso rotation unit. Fifty were tested on both devices. Results demonstrated that the strength data were reliable, with strength being greatest in extension. The following were also learned-torque output declined slightly with increased speed; extensor-flexor strength remained consistent from 18 to 44 years; extension-flexion ratios exceeded 1.1:1; left to right rotation ratios remained 1:1; there was no significant difference between torque adjusted to body weight or to lean body weight.

Original languageEnglish
Pages (from-to)757-764
Number of pages8
JournalSpine
Volume10
Issue number8
DOIs
StatePublished - Oct 1985

Keywords

  • Isokinetic
  • Isometric
  • Lean body weight
  • Lumbar spine
  • Trunk strength

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