| Research purposes: In this study,the kinematic parameters of the lower limbs of healthy subjects were collected,and the coupling angle(CA)of the lower extremity joints was calculated and the coordination mode was frequency-counted to reflect the coordination mode and rotation direction between the joints.Provide a theoretical basis for the quantitative analysis of gait research,so as to better guide the treatment and recovery of the disease.Research method: In this study,30 healthy college students(15 males and 15 females)were selected as subjects,VICON infrared three-dimensional motion analysis system,AMTI(40cm*60cm)force gauge,Basler high-speed camera and infrared speedometer,etc.produced by UK OML company,The lower extremity kinematic parameters of 30 subjects in slow(3.40±0.23km/h,ie 0.88m/s-1.008m/s),medium(4.88±0.40 km/h,ie 1.24m/s-1.46m/s)and fast(6.49±0.61 km/h,ie 1.63m/s-1.97m/s)walking conditions were collected.Using MATLAB8.3 software to calculate the coupling angle between the lower limbs of the lower limbs of the human body,draw and compare the angular-angle diagrams at different walking speeds,and use the vector coding technique to compare and compare the motion coordination modes between the lower limbs of the human body.Research result:(1)As the walking speed increases,the step size and the step frequency of the subject are adjusted.The specific performance is that the step size increases and the step frequency becomes faster.(2)At the moment of landing,the hip joint angle,knee joint angle and ankle joint angle gradually increased with the increase of walking speed,and there was a significant difference(P<0.01).(3)At the moment of leaving the ground,the hip joint angle,knee joint angle and ankle joint angle gradually increased with the increase of walking speed,and there was a significant difference(P<0.01).(4)The angle-angle diagram formed by each gait cycle of the hip-knee,hip-knee,and knee-ankle joints changes periodically,and the shape of the formed figure is basically the same.And as the speedincreases,the maximum value of the hip-knee,hip-knee,knee-ankle joint angle-angle map increases,and the minimum value decreases.(5)During the support phase,the hip-knee joint coupling angle decreased gradually with the increase of walking speed,and there was no significant difference(P>0.05).The hip-ankle joint coupling angle gradually increased without significant difference(P>0.05).The knee-ankle joint coupling angle was gradually reduced,and there was a significant difference(P<0.01).(6)During the swing phase,the hip-knee joint coupling angle gradually increased with the increase of walking speed,with significant difference(P<0.01);the hip-ankle joint coupling angle decreased gradually,and there was no significant difference(P>0.05).The knee-ankle joint coupling angle gradually increased and there was a significant difference(P<0.01).(7)In the support phase,the hip-knee joints at the three speeds were dominated by HP+ and H+K-coordination modes,and there were significant differences between the groups(P<0.05).The hip-ankle joints were coordinated with AP+and A+H+.There were significant differences between the two groups(P<0.01).The knee-ankle joints were mainly AP+,A+K+ and KP+ coordination patterns,and there were significant differences between the groups(P<0.05).(8)Hip-knee,hip-knee,knee-ankle joints at different speeds in the swing phase involve essentially all coordination modes.At three speeds,the hip-knee joints were dominated by KP+,KP-,and H+K-coordination modes,and there was no significant difference between the groups(P>0.05);hip-ankle joints were A+H+,HP-and the A+H-coordination mode is dominant,but there is a significant difference between the three speeds of A+H+ coordination mode(P<0.05),while there is no significant difference between the three speeds of HP-and A+H-coordination mode(P>0.05);The knee-ankle joints were mainly in the AP+,A+K+,and KP+ coordination modes,and there was a significant difference between the AP+coordination mode groups(P<0.05),while there was no significant difference between the A+K+ and KP+ coordination mode groups(P>0.05).Analysis conclusion:(1)As the walking speed increases,the kinematic parameters of the lower extremity joints of the human body change regularly.The specific performance is as follows: the step size is increased,the gait cycle time is shortened,the support time,thedouble support time,the swing time is shortened,and the hip joint and the knee are on the ground.The angles of the joints and ankles gradually increase,and the angles of the hip joints,knee joints,and ankle joints gradually increase when the ground is removed.(2)At different speeds,the angular-angle diagram formed between the joints changes periodically,and with the increase of walking speed,the hip-knee joint and knee-ankle joint angles tend to change regularly.-The coupling angle of the knee joint and knee-ankle joint gradually decreased,and the hip-ankle joint coupling angle gradually increased;the hip-knee joint and knee-ankle joint coupling angle gradually increased during the swing phase,and the hip-ankle joint coupling angle gradually decreased.(3)In the support phase,the hip-knee coordination mode is dominated by HP+ and H+K-,and the frequency of H+K-coordination mode increases with the increase of speed,while the HP+ coordination mode has no regular change;the hip-ankle coordination mode AP+ and A+H+ are dominant,and the frequency of AP+ coordination mode increases with the increase of speed,A+H+ coordination mode decreases with the increase of speed;knee-ankle coordination mode with AP+,A+K+ and KP+ The frequency of the main and KP+ coordination modes decreases with the increase of the speed,while the AP+ and A+K+ coordination modes have no regular changes.(4)The swing phase involves most coordination modes,but the hip-knee coordination mode is dominated by KP+,KP-,and H+K-,and the three coordination modes have no regular changes with increasing speed;hip-ankle coordination mode is A+H+,HP-and A+H-main,and the frequency of occurrence of A+H+ coordination mode changes irregularly with the increase of speed,HP-coordination mode shows a decreasing trend,although A+H-coordination mode has no regular change,but at medium speed and fast condition The frequency of occurrence of the next is about the same;while the knee-ankle coordination mode is mainly AP+ and A-K-,the frequency of AP+coordination mode increases with the increase of speed,while the A-K-coordination mode has no regular change. |
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