Pre-activation Affects the Effect of Stretch-shortening Cycle by Modulating Fascicle Behavior

Overview

Journal Biol Open

Specialty Biology

Date 2019 Dec 22

PMID 31862776

Citations 2

Authors

Atsuki Fukutani

Kento Shimoho

Tadao Isaka

Affiliations

Soon will be listed here.

Abstract

The torque attained during active shortening is enhanced after an active stretch (stretch-shortening cycle, SSC). This study examined the influence of pre-activation on fascicle behavior and the SSC effect. Subjects exhibited the following three conditions by electrically induced plantar flexions. In the isometric-concentric (ISO-CON) condition, subjects exhibited active shortening from dorsiflexion of 15° to 0° after isometric pre-activation. In the eccentric-concentric (ECC-CON) condition, subjects exhibited the above active shortening immediately after the eccentric pre-activation. In the isometric-eccentric-concentric (ISO-ECC-CON) condition, isometric pre-activation was conducted before exhibiting the ECC-CON maneuver. Joint torque and fascicle length of the medial gastrocnemius were compared. The joint torque at the onset and end of shortening was larger in the ISO-ECC-CON than in the ISO-CON or ECC-CON conditions, while no differences were found between ISO-CON and ECC-CON conditions. The magnitude of fascicle elongation attained during the active stretch was larger in the ISO-ECC-CON than in the ECC-CON condition. This could be caused by the shorter fascicle length at the onset of active stretch due to isometric pre-activation. This shorter fascicle length could lead to larger fascicle elongation during the subsequent active stretch, which should emphasize the effect of active stretch-induced force enhancement mechanism.

Citing Articles

Evidence for Muscle Cell-Based Mechanisms of Enhanced Performance in Stretch-Shortening Cycle in Skeletal Muscle.

Fukutani A, Isaka T, Herzog W Front Physiol. 2021; 11:609553.

PMID: 33488399 PMC: 7820781. DOI: 10.3389/fphys.2020.609553.

Contribution of Stretch-Induced Force Enhancement to Increased Performance in Maximal Voluntary and Submaximal Artificially Activated Stretch-Shortening Muscle Action.

Groeber M, Stafilidis S, Seiberl W, Baca A Front Physiol. 2020; 11:592183.

PMID: 33281623 PMC: 7689280. DOI: 10.3389/fphys.2020.592183.

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