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Experimental Framework for Quantifying Muscle Force-Length Behavior in Dynamic Exercise

Authors :

Erfan Farahani¹ Manizheh Zakeri² Mohammad-Reza Sayyed Noorani³

1- دانشگاه تبریز 2- دانشگاه تبریز 3- دانشگاه تبریز

Keywords :

Force-length relationship،Biceps brachii،Range of motion،Musculoskeletal modeling

Abstract :

The force-length characteristics of the biceps from resistance exercise training were studied, and the most important role of range of motion (ROM) under three contraction conditions (0-90°, 90-140°, and 0-140° during elbow flexion) was presented during the standing dumbbell biceps curl. Muscle force and mechanical tension are important for Hill-based muscle modeling, and ROM is an important determinant of both. A total of eight controlled repetitions were carried out by five healthy male subjects with a variety of training experiences. Motion capture data were collected with a Motion Analysis system and processed in OpenSim with a modified Arm26 model to extract elbow joint kinematics and normalized biceps muscle lengths. These lengths were filtered and used to calculate the active force-length modifier, which generated continuous force-length curves for the long and short heads of the biceps for all ROMs. The methodology produced stable physiologically realistic force-length relationships and was shown to be a reliable method for use in resistance training analysis. In summary, the workflow provides a practical reference for the quantification of muscle mechanics and can be used to understand the influence of ROM on muscle force in Hill-based models and inform evidence-based training protocols.