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• W2137722900 abstract "Many locomotor activities require muscles to actively lengthen, dissipate energy and decelerate the body. These eccentric contractions can disrupt cytoskeletal structures within myofibrils and reduce force output. We examined how architectural features of pennate muscles can provide a protective mechanism against eccentric muscle damage by limiting fascicle lengthening. It has been previously shown that the angled fibers of pennate muscles change orientation when shortening. This change in fiber orientation can amplify fascicle shortening, resulting in a velocity advantage at the level of the muscle–tendon unit (MTU) that is characterized by a gear ratio (MTU velocity/fascicle velocity). A muscle's architectural gear ratio (AGR) has been shown to vary as a function of force during shortening, while AGR during lengthening remains largely unknown. We independently measured fascicle length and MTU length in vitro in the bullfrog plantaris. We characterized the muscle's force–velocity curve and AGR during both shortening and lengthening across a broad range of forces (10–190% peak isometric force). AGR was measured during the isotonic portion of each contraction, to eliminate possible contributions of series elasticity to MTU length changes. We found that gear ratio varies with force during both shortening and lengthening contractions. The highest AGR was observed during lengthening contractions, indicating that lengthening of the MTU can occur with relatively little stretch of the fascicle. As fascicle strain is considered an important determinant of muscle damage, a high gear ratio may afford pennate muscles protection against the damaging effects of active lengthening." @default.
• W2137722900 created "2016-06-24" @default.
• W2137722900 creator A5001855598 @default.
• W2137722900 creator A5057518225 @default.
• W2137722900 date "2014-02-01" @default.
• W2137722900 modified "2023-09-30" @default.
• W2137722900 title "Geared up to stretch: pennate muscle behavior during active lengthening" @default.
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• W2137722900 doi "https://doi.org/10.1242/jeb.094383" @default.
• W2137722900 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4008126" @default.
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