著者

林 和彦 白崎 芳夫 池田 洋教 立石 哲也 下條 仁士 宮永 豊

出版者

特定非営利活動法人 日本バイオレオロジー学会

雑誌

日本バイオレオロジー学会誌 (ISSN:09134778)

巻号頁・発行日

vol.17, no.2, pp.26-32, 2003-06-30 (Released:2012-09-24)

参考文献数

12

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The mechanical properties of the anterior cruciate ligament (ACL) were investigated. The method of a versatile clamp was designed to holding the femur-ACL-tibia complex (FATC). Twelve porcine FACT specimens were tested at angle 30° and the parallel direction of the ACL. The static tensile and stress relaxation tests were performed with an Instron-type universal testing machine. Differences in stress-strain behavior at the two (slow and fast) deformation rates. The ACL AM (anteromedial) bundle exhibited significant distribution of the deformation at the two deformation rates. Good agreement is obtained using Y. C. Fung's QLV (quasi-linear viscoelastic) theory relationship between theoretical and experimental data.

著者

高野 純平 藤井 範久 向井 直樹 劉 莉荊 林 和彦 白崎 芳夫 斉藤 慎一 徳山 薫平

出版者

一般社団法人日本体力医学会

雑誌

体力科学 (ISSN:0039906X)

巻号頁・発行日

vol.53, no.1, pp.123-130, 2004-02-01 (Released:2010-09-30)

参考文献数

25

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Side to side difference in tennis players' mid-radius and cross-sectional study on mid-tibia of jumpers and sedentary controls suggest that the improvement of mechanical properties of cortical bone in response to long-term exercise is related to geometric adaptation and not to volumetric bone mineral density. In the present study, geometric and mechanical properties of right tibia were estimated along 64 directions centering center of gravity of the bone on cross-sectional peripheral quantitative computed tomography (pQCT) images. The tibias of 17 jumpers (7 females, 10 males) and 15 controls (8 females, 7males), aged 18-23, were scanned at mid site using pQCT. Periosteal and endocortical radius were larger, cortical thickness was thicker, and mechanical properties (moment of inertia of area and strength strain index) were greater in jumpers compared to those of controls. The differences in cortical thickness between the two groups were dependent on direction of measurement. Defined a direction from tibia's center of gravity to fibula's as 0°, difference in the cortical thickness between jumpers and controls was the greatest at around 240°. Along this direction, differences in mechanical properties were also the most significant, suggesting that the site-specific adaptation of bone to long-term exercise is due to geographical relation of bone to muscle.

著者

立石 哲也 白崎 芳夫 島村 昭治 勝世 敬一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.45, no.396, pp.823-835, 1979-08-25

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合目的な海綿骨の構造と特性を材料工学的に応用することを目的とするソフトメカニクス研究の第一歩として,粘性流体を充てんした多孔質粘弾性体の力学モデルを提案し,これを用いて水,関節液,タービン油,バクトラ油などの粘性流体を含浸した多孔質ポリプロピレンの衝撃吸収性と過重支持性を理論的に明らかにすると共に将来の軟機械用材料に欠くことのできない機能的な可変モジュラス材料の設計の指針を与えた.