| This thesis is aimed at analyzing the biomechanical characteristics of movement in barefoot and wearing shoes, comparing the performance of different running shoes, investigating the effects of damping structure on foot shock absorption through the surface EMG and plantar pressure measurement technology. The significances are to overcome the shortcomings of previous damping shoes design, provide scientific bases and theoretical support for the design and improvement of damping structures, combine the foot shock absorpti- on system with the damping structure soles, achieve the truly people-oriented and the harmony between foot and footwear.First of all, the Footscan plantar pressure trial was carried out to study the characteristics of plantar pressure distribution of the foot and ground interface during walking, running and jumping in barefoot.Secondly, the Pedar insole plantar pressure trial was conducted to research the effects of different damping shoes on the plantar pressure distribution of the foot and shoe interface, so that to compare the shock-absorbing properties of four running shoes and put forward the tentative idea about the damping structure design combined with the wearing comfort evaluation. Finally, the surface EMG trial was synchronously performed with the plantar pressure trial that previously mentioned, in order to test the extrinsic muscles force of the subjects’ foot qualitatively in barefoot and wearing shoes during walking, running and jumping through the surface EMG measurements, and compare the effects of different damping structures on foot shock absorption system.Results:(1) The Footscan plantar pressure trial shows that the metatarsal and heel are the main pressure parts during walking, running, jumping. The percentage of peak pressure has significant increases in midfoot and relative decreases in forefoot and rearfoot combined after wearing shoes compared with the barefoot.(2) The Pedar insole plantar pressure trial shows that three pairs of jogging shoes are significantly lower than that of ordinary shoes in the peak pressure and the pressure time integral of the whole foot. Evaluated by these two indexes, the Bounce structure is best in the shock-absorbing properties, followed by the waveform structure, and the air float damping sole structure is relatively poor.(3) In terms of fit, sole stability, skid resistance, flexibility, resilience and lightweight, the waveform structure is best in the wearing comfort, followed by the Bounce structure and the air float damping sole structure, the ordinary structure is relatively poor.(4) The surface EMG trials show that the barefoot IEMG, RMS and MPF of tibialis anterior, peroneus longus and lateral gastrocnemius during walking, running and jumping are higher than that of wearing shoes, and the better shock-absorbing performance, the more IEMG reduction.Conclusions:(1) Structural damping shoes can average the distribution of plantar pressure, effectively reduce the peak pressure of the forefoot and heel, improve the wearing comfort and alleviate the foot fatigue compared with the common EVA sole.(2) The shock-absorbing properties of three structural damping shoes are significantly higher than that of ordinary shoes, and the bigger deformation spaces, the better resistance, the running shoes are able to absorb more ground impact energies and store that as the driving force for next step.(3) To improve the wearing comfort, the sole flexibility, stability, resilience should be considered combined with the sole material besides the deformation space of structure in the design so taht to achieve the combination of shock absorption and wearing comfort.(4) Structural damping shoes can reduce the muscle contraction force of tibialis anterior, peroneus longus and lateral gastrocnemius. The better shock-absorbing performance of the structural damping sole, the more impacts are absorbed which result in the consumption of energy that transmitted to the foot, and the smaller muscle strength required to perform the same action. |
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