Impact of contraction intensity and ankle joint angle on calf muscle fascicle length and pennation angle during isometric and dynamic contractions.

Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE

Original Publication: London : Nature Publishing Group, copyright 2011-

Ankle Joint*/physiology ; Ankle Joint*/diagnostic imaging ; Muscle, Skeletal*/physiology ; Muscle, Skeletal*/diagnostic imaging ; Isometric Contraction*/physiology; Humans ; Male ; Young Adult ; Adult ; Muscle Contraction/physiology ; Ultrasonography ; Female ; Range of Motion, Articular/physiology ; Leg/physiology ; Biomechanical Phenomena

During muscle contraction, not only are the fascicles shortening but also the pennation angle changes, which leads to a faster contraction of the muscle than of its fascicles. This phenomenon is called muscle gearing, and it has a direct influence on the force output of the muscle. There are few studies showing pennation angle changes during isometric and concentric contractions for different contraction intensities and muscle lengths. Therefore, the aim was to determine these influences over a wide range of contraction intensities and ankle joint angles for human triceps surae. Additionally, the influence of contraction intensity and ankle joint angle on muscle gearing was evaluated. Ten sport students performed concentric and isometric contractions with intensities between 0 and 90% of the maximum voluntary contraction and ankle joint angles from 50° to 120°. During these contractions, the m. gastrocnemius medialis and lateralis and the m. soleus were recorded via ultrasound imaging. A nonlinear relationship between fascicle length and pennation angle was discovered, which can be described with a quadratic fit for each of the muscles during isometric contraction. A nearly identical relationship was detected during dynamic contraction. The muscle gearing increased almost linearly with contraction intensity and ankle joint angle.
(© 2024. The Author(s).)

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Keywords: AGR; Muscle architecture; Muscle gearing; Ultrasound

Date Created: 20241022 Date Completed: 20241022 Latest Revision: 20241025

20241025

PMC11496514

10.1038/s41598-024-75795-2

39438523