Effect Of Turning Angle On Walking Gait Of The Elderly And Its Application

Sit-to-stand(STS)is the transformation from sitting position to standing position.It is a common transitional exercise task,and it is also a routine action to be completed in daily life.Turning around is very common in daily life,especially in indoor walking activities,accounting for 50%.Compared with straight walking,it is more difficult for people to turn and walk,and it is more likely to fall down.In turn,different gait patterns and turning angles also affect the movement of human lower extremities.Usually,after getting up from a chair,there is a short pause and then a continuous movement of one or more steps forward,and to achieve a certain behavioral purpose,a certain angle of turning is often needed Therefore,it is of great significance to study the influence of turning angle on gait characteristics in sitting-to-walk(STW)process for the elderly.We chose 10-15 elderly people aged 60-80 years,and 10-15 young people aged 20-30 years were selected as control group.The walking experiments were carried out on the special chairs of 430mm height,with no armrest and no backrest.Respectively,in straight way,60 degree turning and 90 degree turning.We collect spatial and temporal parameters,kinematic parameters and dynamic parameters of different walking modes by Vicon system and plantar pressure system.Through the collected data,we finish the analyzing job by SPSS,ORIGIN and other statistical analysis software,including the parameters of joint angle,foot pressure center track,ground support reaction,peak plantar pressure and ground support reaction.Through walking test and theoretical analysis,this paper draws the following main conclusions from walking gait,joint angle,plantar pressure,etc.In the choice of turning mode,lateral foot turning is the most commonly used.About 55.7%of the subjects in the experiment chose lateral foot turning mode.The older people have a higher probability of choosing medial foot turning than the younger people,and some of the elderly think that lateral foot turning is more labor-saving.In the lateral foot turning and sitting to walk,the lower limb movement law of 60 degree turning is closer to that of straight walking.With the increase of turning angle,the time of sitting-up stage is obviously prolonged,and it is mainly reflected in the prolongation of bending momentum period and stretching period.Compared with the younger control group,.This may be due to the movement completion difficulties caused by the weakening of lower limb muscle strength of the elderly,or the cautious gait to maintain balance and stability.In the movement of medial foot turning and sitting,the lower extremity kinematics of 90 degree turning in the elderly experimental group was closer to that of straight walking,and the plantar pressure of the front foot of the turning leg was lower,while the results of the young control group showed that there was no significant difference between the two turning modes.In the elderly group,the movement of body pressure center in the direction of foot width is is more significant.According to the design and discussion and analysis of the experiment,we studied the dynamics and kinematics characteristics of the lower limb joints,and the design idea of portable electric driving aids for the lower limbs was put forward,and wen can provid reasonable guidance suggestions for the daily activities of the elderly.