PMID: 8964774Apr 1, 1996Paper

A static shoulder model based on a time-dependent criterion for load sharing between synergistic muscles

Journal of Biomechanics
J NiemiE Viikari-Juntura

Abstract

A static shoulder model including a novel muscular synergy principle for computing load sharing between the shoulder muscles is presented. This principle is feasible especially when analysing endurance-type activities. According to the principle, time elapsed from the start of the activity decreases the allowable muscle stress levels on the basis of the stress-endurance time curves of individual muscles. At low load levels the sum of the squared forces is minimized. At higher load levels the increase in the stress levels of individual muscles is counteracted in order to prevent fatigue. In the model the direction of the contact force in the glenohumeral joint is constrained. The stiffness of the shoulder can also be constrained to produce more muscular co-contraction in tasks with high precision demands.

References

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Citations

Feb 6, 2004·Journal of Biomechanics·B L Kaptein, F C T van der Helm
Sep 25, 2007·Computer Methods in Biomechanics and Biomedical Engineering·Clark R DickersonRichard E Hughes
Apr 22, 2009·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Philippe FavreChristian Gerber
Oct 31, 2006·Clinical Biomechanics·Ahmet ErdemirAntonie J van den Bogert
May 9, 2006·Journal of Shoulder and Elbow Surgery·Naomi OizumiAkio Minami
Oct 11, 2003·Archives of Oral Biology·L R IwasakiJ C Nickel
Jun 25, 2005·Clinical Biomechanics·Philippe FavreHilaire A C Jacob

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