2021 Fiscal Year Final Research Report

How much human can reproduce their motion in water environment - an investigation with single joint -

Research Project

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Project/Area Number	19K11649
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 59040:Nutrition science and health science-related
Research Institution	Chiba Institute of Technology
Principal Investigator	Kaneda Koichi 千葉工業大学, 先進工学部, 教授 (10534589)
Co-Investigator(Kenkyū-buntansha)	速水達也信州大学, 学術研究院総合人間科学系, 准教授 (50551123) 佐藤大輔新潟医療福祉大学, 健康科学部, 教授 (60544393)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	水中環境 / 再現性 / 動作 / 姿勢 / 筋活動
Outline of Final Research Achievements	This study aimed to reveal the motion reproducibility of self-imagined in the water environment. The two experiments were set. 1- Reproduce self-imagined motion, 2 - Reproduce pre-memorized motion with land environment. The reproduction of the both experiments were conducted with and without water immersion of single arm. During session, elbow joint angle and upper limb muscle activity was measured. As results, the self-imagined elbow joint angle estimated smaller in the water environment than the land environment. The reduced muscle activity mainly in agonist muscle and changed agonist-antagonist activity balance in the water environment were considered to be affected the results. In addition, the pre-memorized elbow joint angle estimated smaller in the water environment than the land environment. Therefore, acting with larger motion when exercising in the water evironment regardless of self-imagined or pre-memorized was important for gaining the effect of the exercise.
Free Research Field	応用健康科学
Academic Significance and Societal Importance of the Research Achievements	水中環境での運動は健康増進やリハビリテーションでも用いられるが，身体機能や身体動作の維持・改善や再獲得を目的とする際は，目的とする身体動作を水中環境でどの程度再現できるのかが重要な要素の１つである．本研究では，水中環境では自身の身体動作イメージや陸上環境で記憶した身体動作をやや小さく見積もる傾向が見られた．従って，水中環境で運動を行う場合は身体動作を意識的に大きく行うことが重要であると考えられる．また，身体動作の制御では筋の協調が重要な要素の１つである．本研究では，水中環境で特異な主動筋と拮抗筋の協調作用が認められた．従って，身体動作の制御機能を解明するための一助となることが考えられる．