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系統識別號 U0026-1507201723183100
論文名稱(中文) 弧形底鞋的剛度效應與生物力學影響
論文名稱(英文) Stiffness Effects and Biomechanical Implications in Rocker-Soled Shoes
校院名稱 成功大學
系所名稱(中) 生物醫學工程學系
系所名稱(英) Department of BioMedical Engineering
學年度 105
學期 2
出版年 106
研究生(中文) 林世永
研究生(英文) Shih-Yung Lin
學號 P88961047
學位類別 博士
語文別 英文
論文頁數 56頁
口試委員 指導教授-張志涵
口試委員-蘇芳慶
口試委員-陳家進
口試委員-張家豪
口試委員-葉純妤
中文關鍵字 弧形底鞋  剛度  鞋底材質  裸足  足底受力  地面反作用力 
英文關鍵字 rocker-soled shoes  stiffness  sole material  barefoot  plantar force  vertical ground reaction force 
學科別分類
中文摘要 弧形底鞋可以降低足底受力、改變行走時的步態,本研究設計兩款弧形底鞋來驗證這種特殊設計的鞋底如何改變足底受力,以及對於步態時間與動作的影響。
這兩款弧形底鞋分別具有較軟與較硬的鞋底材質,本研究徵招11位受試者,以裸足、市面銷售之平底鞋、兩款弧形底鞋等四種狀態,進行行走與慢跑兩種不同步行速度的動作實驗,並收集步行中的足底受力、地面反作用力、腳踝角度等運動學參數,最後將這兩款弧形底鞋的實驗數值與裸足以及平底鞋的實驗數值進行比對。
若以裸足為比較基準,在行走動作下,實驗結果顯示平底鞋的足底受力比裸足來得高,而弧形底鞋的足底受力則比裸足來得低,其中以具有較軟鞋底材質的弧形底鞋其足底受力最低。此外,平底鞋的足底受力高於地面反作用力,而弧形底鞋的足底受力則低於地面反作用力,低了13.87-30.55%體重。然而,當行走速度增加,開始進入慢跑動作時,實驗結果顯示三種鞋型的足底受力都比裸足來得高,除了具有較硬鞋底材質的弧形底鞋在產生第二次足底受力峰值時出現例外。
有趣的是,如果比較具有較軟與較硬材質的兩種弧形底鞋,因為慢跑時地面反作用力透過鞋底傳到腳底的傳遞速度較快,較軟材質的弧形底鞋足底受力反而比較硬材質的弧形底鞋足底受力來得高,此結果顯示較軟的鞋底材質對於吸收快速產生的衝擊力效果不佳。
若進一步探討弧形底鞋對於行進動作所造成的效應,弧形鞋底可使原本正常步態中的足底轉動與腳踝旋轉兩現象時間增長,並使此兩現象重疊時間增加,因而產生同步滾動效應,進而降低行進時產生的足底受力。可見弧形底鞋降低足底受力的機制是將行走時的垂直動能轉化成旋轉動能。
由於行走時的足底受力與:1.腳與地面間的接觸方式、以及2.人體採用的減速方法有關係,因此藉由:1.弧形底鞋的同步滾動效應、2.不同鞋底材質設計與3.適當的步行速度搭配,可達到降低行走時足底受力的最佳功效。
英文摘要 Rocker-soled shoes provide a way to reduce the possible concentration of stress, as well as change movement patterns, during gait. This study attempts to examine how plantar force and spatio-temporal variables of gait are affected by two rocker designs, one with softer and one with denser sole materials, by comparing them with the barefoot condition and with flat-soled shoes.
Outer surfaces of the rocker shoes were curved upward at front and rear; middle section is flat. The front apex is designed to follow the line from the 1st to the 5th metatarsal heads, which is about 60% of the shoe length from the heel. The rear apex is designed to fall under the junction of the plantar fascia and calcaneus, which is about 25% of the shoe length from the heel. Shoe soles have three layers including upper midsole, bottom midsole, and outsole and using three different typically non-linear materials. All material properties were conformed to ASTM standards.
Kinematic data, vertical ground reaction force, and plantar force were acquired using Vicon Motion System, AMTI force plate, and Pedar insole system, respectively. Eleven subjects’ gait parameters during walking and jogging were recorded. Each subject was asked to perform eight different tasks; the order of the four foot-ground interface conditions (barefoot, flat-soled shoes, rocker-soled shoes with softer material, and rocker-soled shoes with denser material) and the two activities (walking and jogging) was randomly assigned. The experiment collected in total 264 gait cycles, and for each relevant event analyzed the parameters of plantar force, duration of event, and angle.
Our results showed that compared with barefoot walking, plantar forces were higher for flat shoes while lower for both types of rocker shoes, the softer-material rocker being the lowest. The plantar force of flat shoes is greater than the vertical ground reaction force, while that of both rocker shoes is much less, 13.87-30.55% body weight.
However, as locomotion speed increased to jogging, for all shoe types, except at the second peak plantar force of the denser sole material rocker shoes, plantar forces were greater than for bare feet. More interestingly, because the transmission of force was faster while jogging, greater plantar force was seen in the rocker-soled shoes with softer material than with denser material; results for higher-speed shock absorption in rocker-soled shoes with softer material were thus not as good. In general, the rolling phenomena along the bottom surface of the rocker shoes as well as an increase in the duration of simultaneous curve rolling and ankle rotation could contribute to the reduction of plantar force for both rocker designs. The possible mechanism is the conversion of vertical kinetic energy into rotational kinetic energy.
To conclude, plantar force is related to foot-ground interface and deceleration methods. Apart from the design of shoe-soles and the thickness of shoe heels, different shoe-sole materials and stepping speed are also significant factors in inducing compensatory postures in the feet. Rocker-design shoes with a material suited to step speed could achieve desired plantar force reduction through certain rolling phenomena, shoe-sole stiffness levels, and locomotion speeds.
論文目次 中文摘要 I
Abstract III
誌謝 V
Contents V
Figure Captions IX
Table Captions XII
Chapter 1 Introduction 1
1.1 Background 1
1.2 Literature review 4
1.2.1 Rocker shoes 4
1.2.2 The strengths of rocker-sole design 5
1.3 Objectives 6
Chapter 2 Materials and Methods 7
2.1 Participants 7
2.2 Foot-ground interface conditions 7
2.2.1 Flat 8
2.2.2 Rocker-1 8
2.2.3 Rocker-2 11
2.3 Equipment and instruments 11
2.3.1 Motion capture system 11
2.3.2 Vertical ground reaction force measurement system 12
2.3.3 Plantar force measurement system 12
2.4 Biomechanical parameters measurement 12
2.4.1 Procedure 12
2.4.2 Calculating values for constructing the Pedotti diagram 16
2.4.3 Analyzing parameters of event forces, duration, angles, and centre of pressure shift 17
2.4.3 Statistical analysis 20
Chapter 3 Results 22
3.1 Material testing 22
3.2 Plantar force and duration 23
3.3 Comparisons of Rocker-1 and Rocker-2 27
3.4 Foot angle and gait pattern 29
3.5 Centre of pressure shift and ground reaction force vector angle 31
Chapter 4 Discussion 40
4.1 Compensatory phenomena induced from shoes 40
4.2 Comparisons of shoe sole materials between Rocker-1 and Rocker-2 42
4.3 Comparisons of four types of foot-ground interface 43
4.4 Comparisons with other rocker-soled shoes 46
4.5 Limitations 47
Chapter 5 Conclusions 49
Acknowledgments 50
References 51
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