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Relative contribution of individual muscles to the isometric contraction of a muscular group

Journal of Biomechanics
Publication Date
DOI: 10.1016/0021-9290(75)90024-x


Abstract A technique was developed for calculating the torque generated by two individual muscles (biceps brachii and brachioradialis) that contribute to the isometric flexion of the elbow. The external torque is the sum of individual torques which are unknown. Each individual torque ( C B or C BR ) can be related to the corresponding integrated rectified surface EMG ( Q ̇ B or Q ̇ B ) by means of coefficients ( p B or p BR ). A block of several equations C = p B Q ̇ B + p BR Q ̇ BR is obtained by exploring several experimental conditions. In these conditions, isometric flexion efforts of the elbow were associated to isometric efforts of supination or pronation so as to vary integrated rectified EMG by reciprocal inhibition. By means of a least square method it was possible to know the coefficients p B and p BR . With these coefficients, it was possible to calculate the individual torques generated by the biceps brachii and brachioradialis muscles in each experimental condition.

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