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Article
The effect of a lower extremity kinematic constraint on lifting biomechanics
Applied Ergonomics
  • Sangeun Jin, Iowa State University
  • Gary A. Mirka, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
11-1-2011
DOI
10.1016/j.apergo.2011.02.003
Abstract
Leaning against a stationary barrier during manual materials handling tasks is observed in many industrial environments, but the effects of this kinematic constraint on low back mechanics are unknown. Thirteen participants performed two-handed lifting tasks using both a leaning posture and no leaning posture while trunk kinematics, muscle activity and ground reaction force were monitored. Results revealed that lifting with the leaning posture required significantly less activity in erector spinae (26% vs. 36% MVC) and latissimus dorsi (8% vs. 14% MVC), and less passive tissue moment compared with the no leaning posture. Peak sagittal accelerations were lower when leaning, but the leaning posture also had significantly higher slip potential as measured by required coefficient of friction (0.05 vs. 0.36). The results suggested that the leaning lifting strategy provides reduced low back stress, but does so at the cost of increased slip potential.
Comments

This is a manuscript of an article from Applied Ergonomics, 42: 867-872, (DOI:10.1016/j.apergo.2011.02.003). © 2011. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright Owner
Elsevier, B.V.
Language
en
File Format
application/pdf
Citation Information
Sangeun Jin and Gary A. Mirka. "The effect of a lower extremity kinematic constraint on lifting biomechanics" Applied Ergonomics Vol. 42 Iss. 6 (2011) p. 861 - 872
Available at: http://works.bepress.com/gary_mirka/10/