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Influence of Force–Length Relationship and Task-Specific Constraints on Finger Force-Generating Capacities

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Abstract

Grip strength loss in extended and flexed wrist postures has been explained by reduced force-generating capacities of extrinsic finger flexor resulting from non-optimal length, owing to the force–length relationship. Recent works suggested that other muscles, especially wrist extensors, participate in this grip strength loss. The objective of this study was to clarify the role of the force–length relationship in finger force production. 18 participants performed maximal isometric finger force production during pinch grip (Pinch) and four-finger pressing (Press) tasks in four different wrist postures (extended, flexed, neutral, spontaneous). The maximum finger force (MFF), finger and wrist joint angles, as well as activation of four muscles were determined using dynamometry, motion capture, and electromyography. The force and length of the four muscles were estimated from joint angles and muscle activation using a musculoskeletal model. MFF decreased for flexed wrist during Pinch but remained stable across wrist postures during Press. The results suggested that the loss of pinch grip force in deviated wrist posture is partially related to force–length relationship of finger extensors. In opposition, MFF during Press was not influenced by the modulation of muscle capacities but was probably first limited by mechanical and neural factors related to finger interdependence.

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  1. Aix-Marseille University, CNRS, ISM, Marseille, France

    Benjamin Goislard de Monsabert, Mathieu Caumes, Eric Berton & Laurent Vigouroux

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  1. Benjamin Goislard de Monsabert
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  2. Mathieu Caumes
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Correspondence to Benjamin Goislard de Monsabert.

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Goislard de Monsabert, B., Caumes, M., Berton, E. et al. Influence of Force–Length Relationship and Task-Specific Constraints on Finger Force-Generating Capacities. Ann Biomed Eng 51, 2453–2464 (2023). https://doi.org/10.1007/s10439-023-03276-0

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