Task Dependent Motor Strategy of Human Triceps Surae Muscle

Akasaka, Kiyokazu; Onishi, Hideaki; Ihashi, Kouji; Ichie, Masayoshi; Handa, Yasunobu

doi:10.1298/jjpta.7.15

Cited by 1 publication

(1 citation statement)

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“…In addition, the MG and LG insert above the knee joint, whereas the SOL inserts below the knee. Changes in knee angles appeared to affect the determinants of three triceps surae muscle behavior, including slack length of the series elastic element, mean moment arm, maximum force, and length of the contractile element ( Out et al, 1996 ; Akasaka et al, 2004 ). In general clinical palpation, the higher muscle contraction intensity is, the stiffer muscle is.…”

Section: Introductionmentioning

confidence: 99%

Effects of Knee Joint Angle and Contraction Intensity on the Triceps Surae Stiffness

Lin

Deng

Liang

et al. 2022

Front. Bioeng. Biotechnol.

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Purpose: Monitoring the contractility of muscles assists the clinician in understanding how muscle functions as part of the kinetic system. This study investigated the effect of knee joint angles under different resistance on the stiffness of the medial gastrocnemius (MG), lateral gastrocnemius (LG), and soleus (SOL) muscles using the shear wave elastography (SWE) technique.Methods: A total of 22 females were recruited. During isometric plantar flexion, at knee 0-degree (fully extended) and knee 90-degree (flexed 90°), the shear modulus on the MG, LG, and SOL was measured by shear wave elastography at no contraction and two intensities (40% and 80%) of maximal voluntary contraction (MVC). Shear modulus is a mechanical parameter to describe stiffness, and stiffness is a proxy for muscle contractility.Results: There were moderate-to high-positive correlations between the active stiffness of triceps surae muscles and isometric contraction intensity (r: 0.57–0.91, p＜0.001). The active stiffness in MG and LG with extended knees was higher than that with flexed knees (p＜0.001). The active stiffness in SOL with flexed knee was higher than that with extended knee (p＜0.001).Conclusion: Active stiffness can be considered a quantitative indicator generated by the force output of the triceps surae. Different knee joint angles cause three triceps surae muscles to exhibit non-uniform mechanical properties, which may explain part of the mechanism of soft tissue injury during physical exercise.

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Section: Introductionmentioning

confidence: 99%