The Influence Of Different Hardness Sole To Walking Ability Of Human Body

Objective: Walking is a whole movement that repeat mostly in daily life, At present, the international fashion exercise is walking,The total walking distance of one's whole life is two and a half earth circumference, The feet are shocked by 600 to 700 times gravity while one walk for one kilometer, the impact is bigger in the intense exercise, Both feet would feel exhausted if the shoes without damping system can not alleviate the impact, and so the knees, waists, back and brain bear the damage of impact. Scientis have a lot of research about gait, there are thousands of articles and a lot of researches on shoes in the internet.However, the research on the shoes with different hardness soles have not been reported. Therefore, the biomechanics analysis on the walking with different hardness soles shoes is very important, the mechanical parameters and the reliable method to evaluate the characteristics of the shoes sole are so.Method: (1) The preparation and the mechanical properties testing for different hardness shoes sole: sole The Instron materials tester be used refer to the determination of GB/T 13634-92 thermoplastic rubber compression and stress relaxation, Select three different kinds of hardness, measuring the modulus of elasticity, the stress relaxation of the soles, to search the different hardness shoes to be used in gait test, and finish the shoes makeing, the weight of the shoe is 103 grams. (2) Experimental apparatus: 1,Vicon infrared imaging system is used to capture the static and dynamic data, and find out the main foot kinematics parameters of the effects that different hardness bottom shoe on the long time walking capability. 2,Use Novel - Pedar and Zebris foot measuring system, the foot pressure index of subjects were measured in different hardness of sole out in human walking shoes for a long time, the influence of the foot, pressure, contact area mainly kinetic parameters. 3,Using Biovision 16 channel emg machine, pretibial muscle, the lateral femoral muscle, gastrocnemius and biceps muscles, whose IEMG signals and the signal with MF, sole of shoes in different hardness in human body for a long time to walk in the time domain and frequency domain of muscle index. 4,Consumed movement by testing system, cardiopulmonary by oxygen consumption, energy consumption is calculated quantitatively , it can compared with hardness of subjects wearing shoes sole caused by human physical consumption. (3) Experimental procedure and operating process: 1,In subjects with marker in certain parts of the lower limbs, establish skeleton model, In of the lateral femoral muscle and biceps muscles and tibialis anterior abdominal muscle, the gastrocnemius muscle are put on the electrode, experiment of muscle normalized before. 2,in no testing before muscle and arches highly calibration. 3,On different subjects of shoes, shoe sole hardness in Pedar pad in running speed on the insoles for 7.2 km/h fitness go, lasting 60 minutes action in accordance with the regulations. Subjects are six days, the first day in experiment, wearing soft bottom shoes;then wearing medium hard bottom shoe the second day;the third day wearing hard bottom shoes, every 5 minutes acquisition test data.4,When the test ends,let arches height with bare feet and then in force on flat, record data.5,Test process every 5 minutes to ask participants, and different body wear shoes on their hardness shoes and walk, and the influencing table subjective. (4)Data processing: all data are analyzed by the SPSS 13.0,The result express with the mean value±standard deviation, carries on the Independent Sample T-test and Double factor ANOVA and Pearson correlation analysis, significant difference (P < 0.05). Results: (1) Gait cycle with soft shoes than other shoes, the extension angle of of the leg increases minimum, the flexion angle maximum, Ankle angle is minimum,The period and heel on palm from ankle angles are lower, period of time - shoes for soft shoes interaction influences on the most obvious, medial malleolus with sufficient height are significantly lower back, compared to other heel shoes stress is lesser, arches inside and outside, the metatarsal bone in three areas, walking process more obvious stress on tiptoe part. The contact area of soft bottom shoe soles and lateral force is big enough to cause collapse bow earlier in. Integral whole electric value than the other two pairs of shoes, gastrocnemius muscle of electrical activity, especially large fatigue. Steady state, wear soft bottom shoe the Vo2max, higher energy. (2) Wear moderate hard bottom shoe front leg Angle; set minimum, Knee extensor knees maximum Angle, the minimum, Maximum ankle angles. With shoes of medium hardness in a short time, the Vo2max, breathing, heart rate, respiration, ventilation, energy consumption will be relatively low compared to the other two groups. (3) With the hard bottom shoe front leg angle, placed after the minimum; wearing shoes on hard phase from heel-from the time reduced to tiptoe, swinging period of time are relatively stable. Wear high heels on tiptoe hardware acceleration swing, swing late period of time, the height of tiptoe toe shoe - from interaction in the period from period to heel. Wear shoes in accelerating hard swinging Angle, ankle plantar flexion delay. Wear shoes sole largest stress, hardness of lateral calcaneal metatarsal area, the area is obvious. The whole foot arch, lateral area were significantly, especially in the metatarsal bone particularly stress area. Hard bottom shoe sole contact area for arches, have protective effect. Steady state, wearing hard bottom shoe of low oxygen, less energy. (4) With the increase of hardness, foot soles the pressure from the center of the metatarsal bone in order to move. Foot pressure center path length, compared with bare feet when wear medium hard shoes and walk the path of hard merchant, and longer length is wear soft bottom of merchant track length. (5) The influence of hard bottom shoe on walking performance is biggest, and then the soft bottom shoe, the moderate soft bottom shoes is least.Conclusions: (1)The soft bottom shoes can absorb more impact from ground, and to be wear comfortablely,but its iEMG value is higher than the other two kinds of shoes. Its gastrocnemius get fatigued earlierly. Oxygen uptake and energy expenditure is bigger as wearing soft bottom shoes at steady state.It may be selected to wear.(2) The kinematics and dynamics influence to human body is smallest when walking with moderate hardness bottom shoes, and the exercise load stimulation is most suitable.The human body is more easily to adapt it with less time into the work state,and then easy to be wear when ones catrry on a long time exercise.(3) The kinematics and dynamics influence to human body is biggest, One can walk vividly with it, but the planta suffers the greatest impact when walking with hard bottom shoes. Instep is not easy to collapse, to stretch easily. Energy expenditure is least but the suitable time is not long as wearing hard bottom shoes at steady state. It may be select to wear when need walking fastly.Suggestions:(1)The Manufacturer should choose different hardness sole to produce and process shoes considering the functional characteristics of different shoes,and may add introduction of quantitative index about the sole hardness necessarily.(2)Soft bottom is mainly be utilized in leisure shoes manufacture,moderate bottom is mainly be utilized in race walking shoes manufacture, hard bottom is mainly be utilized in track and field shoes manufacture.Should choose suitable shoes aim directly according to the fitness aim.(3)Soft bottom shoes should be choosed in losing weight,moderate bottom shoes should be choosed in mountaineering to prevent foot sprain injury, hard bottom shoes should be choosed in athletics. (4)further study is demanded because of the refinement to soft,moderate and hard sole hardness...