Locus characteristics of plantar pressure center in walking and running modes

doi:10.3969/j.issn.2095-4344.0375

Abstract

Abstract:

BACKGROUND: Walking and running are essential exercises in daily life. Foot joints are flexible and most likely to damage. Displacement of the pressure center can reflect the inner-lateral and anteroposterior movement of the foot, which is an index for evaluating the function of the foot, and is used to describe the complex dynamic function of the foot and sole interface in the gait process.

OBJECTIVE: To analyze the characteristics and regularity of plantar pressure center in different movement modes by studying the locus of plantar pressure center in the course of walking and running in young males.

METHODS: The walking and running patterns of 45 healthy young men were tested with Footscan force measuring plate, and gait test and analysis were carried out. The foot pressure trajectory and foot progression angle were observed.

RESULTS AND CONCLUSION: (1) The percentage of the pressure center locus in the left foot walking and running was significantly different in the initial contact phase, the forefoot contact phase and the foot flat phase (P < 0.05). There was no significant difference at the forefoot push off phase (P > 0.05). There were significant differences in all stages of the right foot (P < 0.05). (2) There was no significant difference in the percentage of center of pressure locus between left and right feet in the walking mode (P > 0.05). The results of left and right feet in running mode were similar to those of walking. (3) There were significant differences in foot progression angle between walking and running mode in initial contact phase, forefoot contact phase, foot flat phase, and forefoot push off phase (P < 0.05). (4) In summary, there are differences in each stage of running support period. The time of foot following the running period becomes short and the heel relative load decreases with the increase of speed. The center of pressure trajectory of the left and right feet of the same motion pattern is not very different, and the center of pressure trajectory can be used to distinguish different motion patterns, and more centers of pressure tracks are offset in the running mode. The foot progression angle in walking and running is largest in the stage of leaving the ground in the front palm, smallest in the contact stage of the whole foot, and the rotation outside the foot in the first two stages, and in the latter two stages. In the initial contact phase and the forefoot push off phase, the foot progression angle is smaller than the walk, while in the other two stages, the foot progression angle is greater than the walk.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Gait, Pressure, Locomotion, Running, Tissue Engineering

CLC Number:

R318

Zhu Yao-jia, Huo Hong-feng. Locus characteristics of plantar pressure center in walking and running modes[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(31): 4987-4992.

Figures/Tables 4

2.1 参与者数量分析按意向性处理，纳入青年男性45名进行走、跑运动模式测试，试验过程中无脱落，全部进入结果分析。试验流程图见图2。 2.2 测量的可靠性用x坐标和y坐标记录压力中心位移。为保证数据的一致性，使用类内相关系数(ICC 2，1)和95%置信区间对压力中心x轴和y轴坐标的试验可靠性进行了测试。根据Shrout等[28](1979)对ICC值的解释(优信度>0.75；良信度为0.75-0.40，信度差<0.40)，关于压力中心变量的内部可靠性，走跑2种运动模式，对于x坐标，ICC值分别为0.74和0.73，y坐标的ICC分别为0.97和0.96。这表明2个运动组的压力中心变量具有良好的可靠性。 2.3 足底压力中心轨迹时间百分比压力中心轨迹时间百分比即对不同时间长度的压力中心轨迹进行归一化处理，压力中心轨迹中各个阶段支撑期时间占总时间的百分比。表2中显示不同运动模式下t 检验压力中心轨迹时间百分比的结果。可以看出左足在走与跑运动模式下压力中心轨迹时间百分比中的初始着地阶段、前掌接触阶段、整足接触阶段差异有显著性意义(P < 0.05)，在前掌离地阶段差异无显著性意义(P > 0.05)，右足在走与跑运动模式下压力中心轨迹时间百分比中的初始着地阶段、前掌接触阶段、整足接触阶段、前掌离地阶段差异有显著性意义(P < 0.05)。表3显示相同运动模式下t 检验压力中心轨迹时间百分比的结果。可以看出在走的运动模式下压力中心轨迹时间百分比中初始着地阶段、前掌接触阶段、整足接触阶段、前掌离地阶段差异无显著性意义(P > 0.05)。在跑的运动模式下压力中心轨迹时间百分比中初始着地阶段、前掌接触阶段、整足接触阶段、前掌离地阶段差异无显著性意义(P > 0.05)。图3显示跑的运动模式比走的运动模式中压力中心轨迹更贴近足中心线。 2.4 足底压力中心轨迹中足旋进角足旋进角(足支撑期各个阶段起始坐标点和结束坐标点连线和前进方向的夹角。旋前时足跟接触地面减震，旋后时推动身体向前行进，通过足旋进角定量反应足在支撑期旋前旋后的程度)。如图3所示，根据相对的压力中心轨迹位移计算出的在足开始触地到结束期间4部分的足旋进角。对于X轴，压力中心测量向内测偏移为负数度，向外侧偏移为正数度。通过计算走、跑运动模式下X轴中左右最大X绝对值，得出X轴上左右2个(X，Y)轴坐标点，将左右(X，Y)坐标点与其起止点连线，计算得出每部分足旋进角数值。在走与跑运动模式比较下，跑的压力中心轨迹更趋于向内侧偏移。由表4和图4得出，足旋进角在初始着地阶段、前掌接触阶段、整足接触阶段、前掌离地阶段差异有显著性意义(P < 0.05)。在初始着地阶段阶段走大于跑，在前掌接触阶段跑大于走，在整足接触阶段跑大于走，在前掌离地阶段走大于跑，并且走和跑在初始着地阶段、前掌接触阶段都为正(向外侧偏移)，在整足接触阶段、前掌离地阶段都为负。 "

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