2022•Journal of Applied PhysiologyRequires access

Eccentric muscle contraction potentiates titin stiffness-related contractile properties in rat fast-twitch muscles

Jiayu Shi, Daiki Watanabe, Masanobu Wada

Abstract

It remains unclear whether eccentric contraction of skeletal muscle affects titin stiffness-related contractile properties. Here, we provide evidence that an acute bout of eccentric contraction can potentiate titin-based passive force, maximum active force at long sarcomere lengths, and length-dependent activation. This potentiation may resist muscle fatigue in the muscles of the exercising body.

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Key concepts: Titin, Sarcomere, Eccentric, Contraction (grammar), Muscle contraction, Muscle stiffness, Stretch shortening cycle, Myofibril