Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping

Abstract The purpose of this study was to investigate the effects of plyometric training on the muscle–tendon mechanical properties and behavior of fascicles during jumping in order to elucidate the mechanisms of improved jump performance due to plyometric training. Eleven subjects completed a 12‐we...

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Autores principales:	Keitaro Kubo, Toshihiro Ikebukuro, Hideaki Yata
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	fascicle hysteresis plantar flexion stiffness ultrasonography Physiology QP1-981
Acceso en línea:	https://doaj.org/article/55a1cb9a8e51400fa873b97a4be86a34
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spelling	oai:doaj.org-article:55a1cb9a8e51400fa873b97a4be86a342021-11-15T09:54:40ZEffects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping2051-817X10.14814/phy2.15073https://doaj.org/article/55a1cb9a8e51400fa873b97a4be86a342021-11-01T00:00:00Zhttps://doi.org/10.14814/phy2.15073https://doaj.org/toc/2051-817XAbstract The purpose of this study was to investigate the effects of plyometric training on the muscle–tendon mechanical properties and behavior of fascicles during jumping in order to elucidate the mechanisms of improved jump performance due to plyometric training. Eleven subjects completed a 12‐week unilateral training program for plantar flexors. Active muscle stiffness with (100°·s−1) and without (250°·s−1) stretch reflex were calculated according to changes in muscle force and fascicle length during fast stretching after submaximal isometric contractions. Stiffness and hysteresis of tendon were measured using ultrasonography during ramp and ballistic contractions. Three kinds of unilateral jump heights using only ankle joint (no counter‐movement jump: no‐CMJ; counter‐movement jump: CMJ; drop jump: DJ) on sledge apparatus were measured. During jumping, electromyographic activities (mEMG) of plantar flexors and fascicle length of the medial gastrocnemius muscle were measured. Active muscle stiffness at 250 and 100°·s−1 and maximal tendon elongation during ballistic contraction significantly increased after training. Tendon hysteresis during ballistic contraction significantly decreased after training, whereas that during ramp contraction did not. The heights of three jump tests, the ratio of mEMG during eccentric to that during concentric phases for CMJ, and the amount of fascicle shortening and shortening velocity during eccentric phase of DJ significantly increased after training. These results suggest that an increase in CMJ height was associated with changes in the muscle–tendon mechanical properties and muscle activation strategy, whereas an increase in DJ height could be explained by changes in the muscle–tendon mechanical properties, but not muscle activation strategy.Keitaro KuboToshihiro IkebukuroHideaki YataWileyarticlefasciclehysteresisplantar flexionstiffnessultrasonographyPhysiologyQP1-981ENPhysiological Reports, Vol 9, Iss 21, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fascicle hysteresis plantar flexion stiffness ultrasonography Physiology QP1-981
spellingShingle	fascicle hysteresis plantar flexion stiffness ultrasonography Physiology QP1-981 Keitaro Kubo Toshihiro Ikebukuro Hideaki Yata Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
description	Abstract The purpose of this study was to investigate the effects of plyometric training on the muscle–tendon mechanical properties and behavior of fascicles during jumping in order to elucidate the mechanisms of improved jump performance due to plyometric training. Eleven subjects completed a 12‐week unilateral training program for plantar flexors. Active muscle stiffness with (100°·s−1) and without (250°·s−1) stretch reflex were calculated according to changes in muscle force and fascicle length during fast stretching after submaximal isometric contractions. Stiffness and hysteresis of tendon were measured using ultrasonography during ramp and ballistic contractions. Three kinds of unilateral jump heights using only ankle joint (no counter‐movement jump: no‐CMJ; counter‐movement jump: CMJ; drop jump: DJ) on sledge apparatus were measured. During jumping, electromyographic activities (mEMG) of plantar flexors and fascicle length of the medial gastrocnemius muscle were measured. Active muscle stiffness at 250 and 100°·s−1 and maximal tendon elongation during ballistic contraction significantly increased after training. Tendon hysteresis during ballistic contraction significantly decreased after training, whereas that during ramp contraction did not. The heights of three jump tests, the ratio of mEMG during eccentric to that during concentric phases for CMJ, and the amount of fascicle shortening and shortening velocity during eccentric phase of DJ significantly increased after training. These results suggest that an increase in CMJ height was associated with changes in the muscle–tendon mechanical properties and muscle activation strategy, whereas an increase in DJ height could be explained by changes in the muscle–tendon mechanical properties, but not muscle activation strategy.
format	article
author	Keitaro Kubo Toshihiro Ikebukuro Hideaki Yata
author_facet	Keitaro Kubo Toshihiro Ikebukuro Hideaki Yata
author_sort	Keitaro Kubo
title	Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
title_short	Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
title_full	Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
title_fullStr	Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
title_full_unstemmed	Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
title_sort	effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/55a1cb9a8e51400fa873b97a4be86a34
work_keys_str_mv	AT keitarokubo effectsofplyometrictrainingonmuscletendonmechanicalpropertiesandbehavioroffasciclesduringjumping AT toshihiroikebukuro effectsofplyometrictrainingonmuscletendonmechanicalpropertiesandbehavioroffasciclesduringjumping AT hideakiyata effectsofplyometrictrainingonmuscletendonmechanicalpropertiesandbehavioroffasciclesduringjumping
_version_	1718428434679463936

Effects of plyometric training on muscle–tendon mechanical properties and behavior of fascicles during jumping

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