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Prediction of the Lower Extremity Muscle Forces During Stair Ascent and Descent

[+] Author Affiliations
Ali Selk Ghafari, Ali Meghdari, Gholam Reza Vossoughi

Sharif University of Technology, Tehran, Iran

Paper No. DETC2008-50024, pp. 1589-1593; 5 pages
  • ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 3: 28th Computers and Information in Engineering Conference, Parts A and B
  • Brooklyn, New York, USA, August 3–6, 2008
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4327-7 | eISBN: 0-7918-3831-5
  • Copyright © 2008 by ASME


An inverse dynamics musculoskeletal model of the lower extremity was combined with an optimization technique to estimate individual muscular forces and powers during stair ascent and descent. Eighteen Hill-type musculotendon actuators per leg were combined into the eleven functional muscle groups based on anatomical classification to drive the model in the sagittal plane. Simulation results illustrate the major functional differences in plantar flexors of the ankle and extensors of the knee and hip joints during ascent and descent. The results of this study not only could be employed to evaluate the rehabilitation results in the elderly but also could be used to design more anthropometric assistive devices with optimum power consumption.

Copyright © 2008 by ASME
Topics: Force , Stairs , Muscle



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