著者

小嶋 美生 丸山 剛生

出版者

一般社団法人日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics

巻号頁・発行日

vol.2011, pp.122-126, 2011-10-30

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The purpose of this study was to investigate the effect on back load during lifting movement by varying lower limb and trunk posture. Seven subjects performed lifting movements with four conditions, using two foot positions (Odeg, 60deg), and two trunk postures (Neutral, Stoop). 3D kinematics and kinetics data were recorded. Significant decreases in peak right bending angle at L4/L5 and T9/T10 joint were found when subjects rotate right hip joint externally. Stoop posture decreases peak joint reaction force for pelvis longitudinal axis but increases peak left bending toque. To perform lifting movement safely, it is recommended that you rotate hip joint externally and keep trunk neutrally.

著者

大石 泰史 大島 成通 大槻 敦巳

出版者

一般社団法人日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics

巻号頁・発行日

vol.2011, pp.481-484, 2011-10-30

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Kyudo is a competition which applies an arrow on a target, and a series of operations which shoot an arrow are important. This study will focus on one of their drawing motion. Draw become different a school and by individual physique and thought, but it is not analyzed numerically, and almost of the experience to know what the athlete. In this study, consider the optimization of drawing motion for multipurpose genetic algorithm. We analyzed from the perspective of the forward dynamics, using a human and bow model of Japanese archery for even large deformation beam and the rigid link.

著者

坂本 誠馬 長谷川 淳哉 田多 輝洋 鳴尾 丈司 溝田 武人

出版者

一般社団法人日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 : symposium on sports and human dynamics

巻号頁・発行日

vol.2011, pp.532-535, 2011-10-30

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The new NPB Ball was adapted to the Japanese NPB from this year. Compared with the old NPB ball and new one, seem height and width became 0.2[mm] lower and 1.0[mm] wider respectively. In this report, aerodynamics characteristics are measured by using wind tunnel tests. Some calculations of flight trajectory for pitcher's throwing ball and batter's hitting one are conducted.