Influence of body segment dynamics on loads at the lumbar spine during lifting

Y. H. Tsuang, O. D. Schipplein, J. H. Traflmow, G. B J Andersson

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Flexion-extension moments acting at the L5/SI level and hip joints were calculated using three different techniques; a pure static analysis, a static analysis including the inertial force of the load, and a dynamic analysis. Ten subjects participated in the study and were asked to lift a box weighing either 50 N or 150 N, using a freestyle technique. The lifts were performed at normal and fast speed. The intra-subject lifting techniques were consistent when lifting the same loads. The moments predicted by the dynamic analysis and the static analysis were the same when holding weights in static postures. When performing the lifts, differences in the peak moments occurred between static and dynamic analyses. These differences were influenced by external load and by lifting speed. Taking the effect of the inertia of load into account in the static analysis resulted in an increase in the moment magnitude, but the ’predicted moment was still much less than in the dynamic analysis which yielded the largest moment magnitudes. The difference between dynamic and static analysis was greatest when lifting 50 Nat fast speed; an 87% increase in L51S I moment and a 95% increase in hip moment was observed when replacing the pure static with a dynamic analysis.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
Issue number4
Publication statusPublished - 1992
Externally publishedYes


  • Dynamic biomechanical analysis
  • Lifting
  • Lumbar spine
  • Spine load
  • Static biomechanical analysis

ASJC Scopus subject areas

  • Human Factors and Ergonomics
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Industrial and Manufacturing Engineering
  • Psychology(all)
  • Applied Psychology


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