Relationships between individual isometric muscle forces, EMG activity and joint torque in monkeys

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Abstract
The aim of the present work was to determine the EMG activity and the moment of force developed by the main elbow flexor muscles, and to establish on this basis the degree of their participation in isometric contractions performed at various positions of the elbow. This was achieved by recording the following biomechanical parameters: EMG and tensile stress (or force) from biceps brachii (BB) and brachioradialis (BR); EMG from brachialis; external resultant force (FE). It has been calculated that the contribution of BR to external torque decreased from the extension to flexion while that of BB increased from 70° to about 90° and then decreased. How far these data can be extrapolated to man is a matter of discussion based on iEMG and anthropometrical data.

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