A simple polynomial that predicts low-back compression during complex 3-D tasks

Article Abstract:

A proposed polynomial equation can predict low-back compression forces during 3-D loading tasks by using a 90-muscle anatomical model. The model takes into account the way a muscle force vector contributes simultaneously to generation of all three moments namely, axial twist, flexion and lateral bend. The equation is based on model output, which considers muscle co-contractions and also biological muscle coupling which occurs in 3-D spine loading. The method can reasonably examine the risk of compression injury for 3-D tasks in the industry.

Models, Backache, Back pain, Physical measurements, Physical measurement

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Concerning 'a comparison of the augmented bar display object display', by G.C. Elvers and N.J. Dolan

Article Abstract:

The equation of G.C. Elvers and N.J. Dolan in their article entitled 'A comparison of the augmented bar display and object display' was erroneously labeled. Elvers and Dolan should have labeled IB as IA in the equation which was used to evaluate the relationship of theta and phi as functions of alpha, IA and IB. Equations 11 and 12 can be simplified by using derivations based on the trigonometric law of sines and cosines.

Trigonometrical functions, Trigonometric functions

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