Study Of Plantar Pressure Based On Activities Of Daily Living

Nowadays research of plantar pressure has been a hot issue in the field of biomechanics. Many experts and scholars study the special groups, such as diabetes, patients with neurological diseases, etc., by using the plantar pressure aiming to compare the differences between them and normal people. The purpose of this study is to take the actions of lower limb in daily life into consideration, obtain their plantar pressures through measuring equipment, analyze the distribution characteristics of plantar pressure and center of pressure trajectory, and then finally evaluate the body stability under the actions.This study selects 7 lower limb actions in activities of daily living, including stand to squat, squat to stand, stand to sit, sit to stand, slow walking, normal walking, and fast walking. Plantar pressure data is collected through the zebris force plate, and all objects are required completing the actions in uniform posture at least three times, selecting the data of which the action was perfectly done. Matlab and spss play an important part in zoning the plantar sole, integrating and standardizing data, and processing statistical analysis.Main conclusions are reached after collecting and analyzing data of plantar pressure under different lower limb actions implemented by objects:there are some degree of gender differences and bipedal symmetry in plantar pressure; when completing different actions, the distributions of pressure show the same rule, and metatarsal and heel area carry high load while phalanges and mid-foot region carry low load; in stance phase, no significant difference is found between stand to squat and squat to stand, neither between stand to sit and sit to stand. While in the gait phase, peak pressure in metatarsal and heel region increase as the walking speed increases; the balance of squat to stand bellows to stand to squat, and balance of sit to stand bellows to stand to sit, and as the objects walking faster, the ant/post stability seems weaker. This work provides normal baseline standards and reference for clinical analysis, and supplies basis for footwear comfort design. At the same time, suggestions are made that people with poor balance ability should pay more attention to standing from sitting or squatting and choosing proper speed while walking in case of falling down and other imbalance situations.