2022 Fiscal Year Final Research Report
Skin elasticity determines 3D muscle geometry and muscle force generation capacity
| Project/Area Number |
19H04018
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 59030:Physical education, and physical and health education-related
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宮本 直和 順天堂大学, スポーツ健康科学部, 先任准教授 (20420408)
金久 博昭 鹿屋体育大学, 学長, 学長 (50161188)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 3次元超音波法 / 皮膚 / 超音波剪断波エラストグラフィ / 筋形状 / 力発揮能力 / 超音波Bモード法 |
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| Outline of Final Research Achievements |
The skin is the organ with the largest surface area of any living body. Skin covers most of the skeletal muscles, which are the source of body movement, and that skin may contribute to the regulation of muscle contraction tension by altering the impulse firing frequency of motor units through the action of sensory receptors and may be a medium for transmitting force to neighboring muscles. However, other relationships between skin and muscle function have not been clarified. In this study, we compared the amount of change in the three-dimensional shape of muscles during postural change between older and young participants, and aimed to clarify the relationship among the three factors of skin mechanical properties, resting muscle shape, and force-generating capacity. From our data, the study reveals that the shear modulus of skin determines muscle shape, which consequently determines force-generating capacity.
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| Free Research Field |
バイオメカニクス，筋メカニクス，神経生理学
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| Academic Significance and Societal Importance of the Research Achievements |
皮膚は，あまり知られていませんが生体の中でも最大の表面積を誇る器官であります．皮膚の機能としては，外環境と生体との境界組織として圧迫や熱などの刺激に対し，所有する感覚受容器を介して刺激に関する感覚情報を素早く脳にフィードバックする機能を有することはよく知られています．本研究では，皮膚の他の機能，今回は，皮膚には筋肉に対するパッキング作用があり，それによって筋形状や力の発揮能力に影響するかどうか明らかにすることを試みました．高齢者と若齢者から得たデータを比較した結果，皮膚の硬さ（弾性）が低いと，筋形状が歪化されやすく，その結果，力発揮能力が低下することが明らかになりました．
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