Study Of Hip And Plantar Pressure Kinematic Parameters In Sit-to-Stand Transfer Process Of Normal Adults

ObjectiveExplore the influence of gender and age on the hip angle and plantar pressures changein sit-to-stand transfer process. MethodsTo compare the different of kinematic parameters such as joint angle changes, velocity,time and plantar pressure changes such as stress, pressure, contact area, etc.,in differentage and different gender people. We divided the standards of the151subjects intoyoung (20-39years), middle-aged group (40-59years old) and old age group (60-79years), according to gender is divided into men and women. The instruments we usedwere made by the Chinese Academy of Sciences, Hefei Institute of intelligent plantarpressure measuring device (Model: JPD4050manufacturers: Jun Cheng, AnhuiProvince Sports equipment Co., Ltd.) and bio-signal acquisition system (Model:BioDAQ-32type, the Chinese Academy of Sciences, Hefei Institute of intelligent),plantar pressure measurement devices used to measure the sit-stand transfer in theprocess of plantar pressure changes, the biological signal acquisition system used tomeasure the joint angles change in the sit-stand transfer process.Results①During sit-to-stand transfer the trunk forward velocity and joint angle changes inmale and female differences are significant (P <0.05), when in the stand up phasevelocity, pressure changes and changes in contact area were significantly different (P<0.01), Young aged people and middle-aged people have faster trunk forward velocityand less time and joint angle change than old-aged people in sit-to-stand transfer, thedifferences are differen（tP<0.01）.The time to complete sit-to-stand transfer is longer inold-aged people than young-aged and middle-aged people, the differences are different（P<0.01）.②The plantar pressure of men is higher than women in the wholeprocess,the difference is significant(P <0.01).The plantar pressure is also higher inyoung-aged and middle-aged people than old-aged people, the difference is significant(P <0.01). However,the contact area of old-aged people is higer than young-aged andmiddle-aged people,the differences are also significant (P <0.01). ConclusionMen and young people have faster transfer velocity than women and older people insit-to-stand transfer process. The contact area of women is larger than that of men, andolder people also have larger contact area than that of young.