Optimization-based biomechanical evaluation of isometric exteriors on a brake wheel

Christian A. Johnson, Jeffrey C. Woldstad

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


A static three-dimensional low-back biomechanical model was developed to estimate the levels of compressive force on the L3/L4 spinal joint during an experiment that simulated wheel turning. We recorded three-dimensional body posture and the resultant forces at the hands for analysis by the model. The model employed a standard link analysis procedure to resolve the external forces acting on the body to a resultant moment about L3/L4. The model then implemented an optimization algorithm to estimate the internal lumbar muscle forces generated to resist the external forces. The muscle forces and external forces were added to arrive at a prediction of compressive force at L3/L4. The experiment investigated the effects of general body posture, left hand grip, gender, and hand brake torque level upon predicted compressive force at L3/L4. A repeated measures analysis of variance (ANOVA) revealed all but one main effect and some interaction effects to be significant at p < 0.05.

Original languageEnglish (US)
Pages (from-to)693-696
Number of pages4
JournalProceedings of the Human Factors and Ergonomics Society
StatePublished - 1993
EventProceedings of the 37th Annual Meeting of the Human Factors and Ergonomics Society - Seattle, WA, USA
Duration: Oct 11 1993Oct 15 1993

ASJC Scopus subject areas

  • Human Factors and Ergonomics


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