Muscle architecture dynamics modulate performance of the superficial anterior temporalis muscle during chewing in capuchins.

ABSTRACT: Jaw-muscle architecture is a key determinant of jaw movements and bite force. While static length-force and force-velocity relationships are well documented in mammals, architecture dynamics of the chewing muscles and their impact on muscle performance are largely unknown. We provide novel data on how fiber architecture of the superficial anterior temporalis (SAT) varies dynamically during naturalistic feeding in tufted capuchins (Sapajus apella). We collected data on architecture dynamics (changes in muscle shape or the architectural gear ratio) during the gape cycle while subjects fed on foods of different mechanical properties. Architecture of the SAT varied with phases of the gape cycle, but gape distance accounted for the majority of dynamic changes in architecture. In addition, lower

SUBMITTER: Laird MF 

PROVIDER: S-EPMC7156371 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature