Details of a Researcher - SUNAKAWA Rikiya

SUNAKAWA Rikiya

写真a

Title	Associate Professor
Researcher Number(JSPS Kakenhi)	50434163

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Current Affiliation Organization 【 display / non-display 】

Duty University of the Ryukyus Faculty of Education Elementary and Secondary School Teacher Training Program Associate Professor
Concurrently University of the Ryukyus Graduate School of Community Engagement and Development Public Policies and Relations Associate Professor
Charge of Lecture University of the Ryukyus Graduate School of Education Professional Teacher Education Associate Professor

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External Career 【 display / non-display 】

2013.04

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2018.03

Faculty of Education Elementary and Secondary School Teacher Training Program
2018.04

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Research Interests 【 display / non-display 】

Velocity-based training
Post-activation potentiation
トレ―ニング科学

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Thesis 【 display / non-display 】

活動後増強効果に影響を及ぼすスクワット運動の要因ー負荷重量および挙上速度損失からの検討ー

2022.03

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Published Papers 【 display / non-display 】

Effects of different concentric velocity and mechanical work on post-activation potentiation with light load squat

12 5 - 14 2021.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
Influence of differences in velocity loss in velocity-based training on muscle function characteristics

Rikiya SUNAKAWA, Minami FURUGEN

35 ( 1 ) 11 - 22 2021.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
Effects of differences in squat weight and lifting velocity on post-activation potentiation

Rikiya SUNAKAWA

32 ( 3 ) 97 - 107 2020.09 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
The effect of different trunk training on rugby player's balance control ability ―Practical study using slackline―

KIKUCHI Yuta, SUNAKAWA Rikiya, MASUZAWA Takuya

Journal of Scientific Coaching for Training ( Japan Society of Scientific Coaching for Training ) 3 ( 1 ) 3 - 11 2020.08 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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This study aimed to clarify the influence of training using slackline on balance ability. The subject was a rugby player of 18 healthy male college students. Subjects were divided into three groups (slack line group; SL, front and side bridge group; FS, control group; Cnt), training was conducted twice a week for 4 weeks. We measured center of gravity fluctuation, muscle strength, reaction jump test before and after training, ratings of perceived exertion (RPE) was recorded every time immediately after training. The speed of the center of gravity fluctuation wassignificantly decreased after SL and FS training. The back strength did not change between SL and FS, and Cnt showed a decreasing trend. The value of RPE was significantly lower in SL than in FS. It was suggested that the training using the slack line improved the balance ability as much as the stabilization type trunk training, and the subject felt the training strength small.
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The effect of isotonic muscle contraction using different squat conditions on post-activation potentiation

Sunakawa Rikiya, Shimotake Shinichiro

Journal of Scientific Coaching for Training ( Japan Society of Scientific Coaching for Training ) 2 ( 1 ) 18 - 24 2017.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The purpose of this study was to investigate the influence on post-activation potentiation (PAP) by performing isotonic muscle contraction using representative squat in resistance exercise. Subjects in this study were eight healthy male college students with training experience. In order to verify the effect of PAP, a counter movement jump (CMJ) was performed before and after the back-full squat (30%1RM× 3sets × 6reps, 60%1RM× 3sets×3reps, 90%1RM×3sets×2reps), and jump height, peak power, peak velocity, mean power, mean velocity were measured and analyzed. As a result, CMJ jump height (ES=0.68, 0.63), peak power (ES=0.80, 0.96), peak velocity (ES=1.03, 0.60) showed significantly high values after 60% and 90%1 RM conditions.This suggests that performing several sets of isotonic muscle contraction using medium and high intensity squats induce PAP and it can be an effective means as training to emphasize improvement of maximum power and speed.
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