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Anthropometric and Physical Performance Profiles of High School Age American Football Players: 11th and 12th Grade Japanese Athletes

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Journal of Science in Sport and Exercise 2023年第1期5卷 25-33页

作者： Daichi Yamashita shota yamaguchi Fred Ariel Hernandez Yasuhiro Yuasa Depart of Sports Science Japan Institute of Sports Sciences3-15-1NishigaokaKita-kuTokyo 115-0056Japan Institute of Physical Education Keio University4-1-1HiyoshiKanagawa 223-8521Japan Department of Anthropology University of California-Irvine3203 Social&Behavioral Sciences GatewayIrvineCalifornia 92697-5100USA Faculty of Sports and Health Science Department of Sports Science Daito Bunka University1-9-1 TakashimadairaItabashi-kuTokyo 175-8571Japan

Purpose To compare anthropometric and physical performance profiles of Japanese 11th and 12th grade American football players within each positional *** Fifty-two 11th and 12th grade American football players from two Japanese high schools participated in the study during the summer pre-season *** performed anthropometric(height and body mass)and physical(vertical jump,broad jump,40-yard dash,pro-agility shuttle 4-kg medicine ball chest throw,front throw,and back throw)*** jump momentum and 10-yard sprint momentum were also calculated by multiplying the velocity and body *** were divided into two groups by playing positions:skill players and *** Skill players in the 12th grade were better at medicine ball chest throw(d=0.73,P=0.04)and vertical jump momen-tum(d=0.75,P=0.03)than those in the 11th ***,there were no differences in any measurements(P>0.05)between linemen from the two *** The current study suggests that upper and lower body absolute power and momentum production can be improved for skill players even over 17 years *** the other hand,body size and speed,attributes that did not change between 11th and 12th grades,seem to be essential talent identification criteria in the current *** study is needed to monitor longitudinal performance improvements in implementing talent development programs by focusing on the quality of speed,agility and power development at the youth level.

关键词： Cross-sectional study Physical fitness profile Talent identification Talent development Long-term athletic development

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Hayabusa2’s superior solar conjunction mission operations: Planning and post-operation results

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Astrodynamics 2020年第4期4卷 265-288页

作者： Stefania Soldini Hiroshi Takeuchi Sho Taniguchi shota Kikuchi Yuto Takei Go Ono Masaya Nakano Takafumi Ohnishi Takanao Saiki Yuichi Tsuda Fuyuto Terui Naoko OgawaYuya MimasuTadateru Takahashi Atsushi Fujii Satoru NakazawaKent Yoshikawa Yusuke Oki Chikako Hirose Hirotaka Sawada Tomohiro yamaguchi Makoto Yoshikawa Department of Mechanical Materials and Aerospace EngineeringUniversity of LiverpoolLiverpool L693BXUK Institute of Space and Astronautical Science Japan Aerospace Exploration AgencySagamihara 252-5210Japan Fujitsu Limited Tokyo 105-7123Japan Mitsubishi Electric Corporation Tokyo 100-8310Japan

In late 2018,the asteroid Ryugu was in the Sun's shadow during the superior solar conjunction *** the Sun-Earth-Ryugu angle decreased to below 3°,the Hayabusa2 spacecraft experienced 21 days of planned blackout in the Earth-probe communication *** was the first time a spacecraft had experienced solar conjunction while hovering around a minor *** the safety of the spacecraft,a low energy transfer trajectory named Ayu was designed in the Hill reference frame to increase its altitude from 20 to 110 *** trajectory was planned with the newly developed optNEAR tool and validated with real time *** article shows the results of the conjunction operation,from planning to fight data.

关键词： superior solar conjunction Hayabusa2 Ryugu hovering satellite mission operations

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