Analysis On Characteristics Of Plantar Pressure During Jogging In Obese Preschool Children Aged 5～6 Years

Objective: The aim of this study was to reveal the characteristics of dynamic plantar pressure during jogging for obese children and normal children aged 5～ 6 years,which may provide a guidance for the obese children that minimize injury caused by jogging and provide reference for scientific shoe selection.Methods: Twenty children were randomly selected from three kindergartens in Ningbo.The preschoolers who were obese were selected by BMI index criteria.The footscan gait system was used to measure the plantar pressure distribution between the obese children and non-obese children during jogging.SPSS 20 software was used to analyze the difference of dynamics plantar pressure between obese children and non-obese children by independent sample T test analysis.The significance level was set at 0 05.Results:(1)Compared with obese children,the peak pressure in the M2～ 5 regions and the whole hind were significantly greater than the normal group during jogging.The time max pressure of normal children in the M2～ 5 regions during jogging were also significantly shorten.The contact area of the obese group was larger than that of the normal group,and the medial region was remarkably increased.(2)During the whole stage of jogging,foot balance showed that the pressure of the foot between the inside and outside of the obese group was almost greater than that of the non-obese group.In the initial landing stage of the heel,the force on the left big toe of the foot in the obese group and the non-obese group was almost 0,until the middle stage of support,the force on the first metatarsal bone of the obese children was greater than that on the big toe.The foot axial angle in the normal group was within the natural range,but the foot axial angle in the obese group was significantly larger than that in the normal group.Conclusions:(1)The pressure peak,the time max pressure of the obese group in the whole posterior foot regions were appeared greater compared with the normal group during jogging,so obese children need to pay special attention to the protection of the heel.(2)The deviation Angle of the foot axis was larger than that of the normal group,and the obese group had mild external handlebar characteristics,so relevant intervention strategies should be adopted to avoid the occurrence of discomfort and injury as far as possible.