Kodayu Zushi

Kinetic variables of the lower limb joint that affect the drop jump index at different drop heights

Takuya Yoshida, Amane Zushi, Kodayu Zushi, Ryohei Hayashi et autres

Background: The drop jump index evaluates power exertion in the lower limb stretch-shortening cycle. In addition, the ability to exert power during the stretch-shortening cycle can be evaluated in detail by combining the drop jump index with the kinetic variables of the …

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Association of multi-phase rates of force development during an isometric leg press with vertical jump performances

Kodayu Zushi, Yasushi Kariyama, Ryu Nagahara, Takuya Yoshida et autres

PURPOSE: This study aimed to elucidate characteristics of explosive force-production capabilities represented by multi-phase rate of force developments (IRFDs) during isometric single-leg press (ISLP) through investigating relationships with countermovement (CMJ) and rebound continuous jump (RJ) performances. METHODS: Two-hundred-and-thirty male athletes performed ISLP, …

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Effects of progressive weight addition using vests on rebound jump

Amane Zushi, Kodayu Zushi, Takuya Yoshida

BACKGROUND: Rebound jump (RJ) is an exercise that is as short contact time and high as possible and is used to improve lower limb stretch-shortening cycle movements. This study examined the effects of RJ performance and lower limb joint kinetics when weight …

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Assessment of takeoff execution ability in high jumpers by rebound jump

Amane Zushi, Naoto Tobe, Kodayu Zushi, Takuya Yoshida

The purpose of this study was to present the characteristics of performance and kinetics of the rebound jump (RJ) in high jumpers and the characteristics of changes in performance and kinetics of the RJ in the top level high jumpers, and to …

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Characteristics of three lower limb joint kinetics affecting rebound jump performance

Amane Zushi, Takuya Yoshida, Kodayu Zushi, Yasushi Kariyama et autres

The stretch-shortening cycle (SSC) motor execution ability of the lower limb was measured using the rebound jump index (RJ-index) in RJ test; this performance is influenced by the interaction of the forces exerted by the three joints of the lower limb.We aimed …

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The sport event specificity of explosive force production capacity quantified according to the isometric rate of force development during unilateral leg extension

Kodayu Zushi, Yasushi Kariyama, Takuya Yoshida, Amane Zushi et autres

This study aimed to investigate differences in the isometric rate of force development (IRFD) for the early, late, and whole phases of the force-time curve during explosive leg extension among ball sports athletes and track and field athletes. Ninety-one athletes specializing in …

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CHARACTERISTICS OF THREE LOWER LIMB JOINT KIMETICS DURING THE REBOUND JUMP IN FEMALE ATHLETES

Amane Zushi, Kodayu Zushi, Takuya Yoshida

Longitudinal changes in the rate of force development during single-leg press and sports performance for jumpers

Kodayu Zushi, Yasushi Kariyama, Mitsugi Ogata

The aim of this study was to investigate longitudinal changes in rate for development (RFD) during the early, late, and whole phases, and to determine whether early RFD is exhibited in response to the improvement of explosive force production in training throughout …

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The mechanical characteristics of single-leg squat exercise with emphasis on pelvic elevation

Yasushi Kariyama, Ryohei Hayashi, Takuya Yoshida, Amane Zushi et autres

Movement control and muscle function for pelvic movement in the frontal plane (pelvic elevation) are important for various single-leg sports activities. We aimed to clarify mechanical characteristics of pelvic squat (P-Sq: single-leg squat exercise with emphasis on pelvic elevation, developed by our …

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EFFECT OF LEG STIFFNESS DURING REBOUND JUMP ON SPRINT RUNNING KINEMATICS AND KINETICS

Yasushi Kariyama, Kodayu Zushi

CHARACTERISTICS OF STRENGTH AND POWER FOR THE RATE OF FORCE DEVELOPMENT DURING LEG EXTENSION

Kodayu Zushi, Yasushi Kariyama, Amane Zushi, Kazutaka Takahashi et autres

A LONGITUDINAL INVESTIGATION ON DROP JUMP PERFORMANCE-FOCUSING ON BRAIN CONDITION DURING PRE-SET, STRETCH REFLEX AND JOINT KINETICS DURING TAKE-OFF

Takuya Yoshida, Kazutaka Takashi, Masamichi Okudaira, Seita Kuki et autres