A Bio-mechanics Research On Naturally Walking Of 25-27 Year-old Obese Young People

The thesis adopts video and measuring plate to measure the natural walking data of sixteen 25-27 year old non-sports major Postgraduate of Northeast Normal University. During the process of data processing Arial video analysis and plantar pressure plate processing software are used to obtain kinematic and kinetic parameters. The purpose is to reveal the difference between the normal weight young people and young people walking in the natural course of plantar branch to the time, ground time, the percentage of contact time, impulse, pressure loading rate, gait cycle and stays alone phase, step length, step width There are differences in some parameters, and which there is some consensus. The thesis also intends to find out the relationship between these indicators with fat, fat percentage, height, age, etc. The major conclusions are listed below:Kinematics:(1)The double support phase, the percentage of double support phase and the flat feet time of the obese youth are all higher than those of the normal weight youth. The step width of obese youth is wider than the normal weight youth, and it has a noticeably positive correlation with weight and fat percentage. There is no difference in the gait cycle and support phase between the two groups. But the single support phase and step length of the obese youth are shorter than those of normal weight youth, and has a significantly negative correlation with weight and fat percentage.(2) In the normal walking process, at the instance between the single and the double support phase, the ankle joint angle of the obese youth is significantly larger than that of the normal youth, and the knee angle is less than them. In the single support period, each joint angles changes in the same way. When they are lifting the ground, the ankle joint angle of the obese youth is greater than the normal youth. Their hip and knee joint angles change the same way with that of the normal weight youth.Dynamics:(1)The maximum peak pressure on plantar specific region, pressure loading rate, impulse, contact area have a highly significant positive correlation with weight and fat percentage, and weakly related to age, height and shoe size.(2)The landing order and bouncing order between the two groups remained the same, but the organic part of the obese youth is the last 2 ~ 5 phalanx, while the control group is the first one phalanx. Obese youth's contacting time in the foot arch is significantly earlier than the control group, but the bouncing time is later than the control group, and the percentage of contact time is longer than that of normal youth.(3)All the subjects'maximum peak pressure on plantar specific region, pressure loading rate, and impulse are at the third metatarsal, heel, and also the third metatarsal respectively. The contact area is concentrated in the foot arch.