PMID: 8945661Dec 1, 1996Paper

A parametric model of muscle moment arm as a function of joint angle: application to the dorsiflexor muscle group in mice

Journal of Biomechanics
S W Miller, R G Dennis

Abstract

A parametric model was developed to describe the relationship between muscle moment arm and joint angle. The model was applied to the dorsiflexor muscle group in mice, for which the moment arm was determined as a function of ankle angle. The moment arm was calculated from the torque measured about the ankle upon application of a known force along the line of action of the dorsiflexor muscle group. The dependence of the dorsiflexor moment arm on ankle angle was modeled as r = R sin(a + delta), where r is the moment arm calculated from the measured torque and a is the joint angle. A least-squares curve fit yielded values for R, the maximum moment arm, and delta, the angle at which the maximum moment arm occurs as offset from 90 degrees. Parametric models were developed for two strains of mice, and no differences were found between the moment arms determined for each strain. Values for the maximum moment arm, R, for the two different strains were 0.99 and 1.14 mm, in agreement with the limited data available from the literature. While in some cases moment arm data may be better fitted by a polynomial, use of the parametric model provides a moment arm relationship with meaningful anatomical constants, allowing for the direct compar...Continue Reading

References

Feb 1, 1992·Journal of Biomechanics·C W Spoor, J L van Leeuwen
Jan 1, 1990·European Journal of Applied Physiology and Occupational Physiology·J J VisserP A Huijing
Jan 1, 1987·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·L F DraganichG B Andersson
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Citations

Feb 1, 2000·Journal of Biomechanics·M ItoT Fukunaga
Feb 19, 2003·Medical Engineering & Physics·Robert G DennisJohn A Faulkner
Apr 3, 2001·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·S V BrooksJ A Faulkner
Jan 10, 2003·Journal of Morphology·Kirsten M Graham, Stephen H Scott
May 31, 2014·Journal of Applied Physiology·Kazushige SasakiNaokata Ishii

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