2023 Fiscal Year Final Research Report
The research for optimal trunk posture to enhance performance of human movement: the relationship between muscular relaxation and technical performance.
| Project/Area Number |
20K11337
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 59020:Sports sciences-related
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| Research Institution | Oita University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 筋緊張 / 関節トルク成分 / 筋トルク / 運動依存トルク / 体幹姿勢 / 四肢運動 / 筋活動 / 運動連鎖 |
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| Outline of Final Research Achievements |
This study investigated whether optimal trunk posture inhibits excessive muscular force exertion, impedes smoothed movement in limbs necessary for motor skill, analysed the kinetics of limb movements associated with the trunk posture, and examined the linguistic expressions of movements and postures that can be utilized to release such force exertion. In the kinetic analysis, how the baseball pitching technique changes when the trunk is in the round-back and normal postures were examined by calculating joint torque components. The decrease in pitch velocity in the round-back was caused by a decrease in shoulder joint internal rotation torque power, and the increase in muscular activity for the shoulder internal rotation was necessary to increase the velocity. Moreover, the motion and EMG analysis in Japanese archery found that expert players can perform stable archery skills by pushing the bow with the entire upper limb as a single stick without using the shoulder muscles.
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| Free Research Field |
スポーツバイオメカニクスと運動制御
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| Academic Significance and Societal Importance of the Research Achievements |
肩の力を抜く等の運動中の脱力に関する研究は行われてきたが、骨格筋の走行や同一の起始停止に基づく連鎖の影響等の研究や骨格筋配列の中で肩・股関節の筋群の緊張やそれら関節の基となる胴体姿勢により脱力や力発揮が変化するかを検討した研究は無かった。本研究の結果から、投球運動のように腕をムチのように使って高速で振る場合、猫背よりは通常姿勢とすると肩の筋群への負荷が軽減されること、一方、弓道のように、用具から身体へ強い力が加わり、低速かつ静止を必要とする運動で肩関節筋群の筋力に頼る動作を行うと、イップス等意図しない動作の発生に関与する可能性がある。このことから筋力に頼らない動作を行うことの重要性が示された。
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