人体坐姿上肢不同拉力负荷时足底的压力分布

背景：足底压力测量技术已广泛应用于生物力学的步态研究，但多数研究都集中在正常行走或穿各种鞋时的步态时间特征和足底压力分布方面。 目的：探讨人体坐姿条件下上肢在不同拉力负荷过程中足底压力分布的特征。 方法：应用Seat 16/53 mFLEX足底压力测试系统记录40名健康受试者以坐姿在不同拉力负荷条件下的足底压力分布信号，分析在30%，50%，80%，100%最大随意肌力的拉力负荷下，不同年龄及不同性别受试者足底压力的分布。 结果与结论：在不同的拉力负荷下，青年组男性受试者的足底压力值明显大于女性(P < 0.05)，而中年组男性和女性的足底压力值间差异无显著性意义(P> 0.05)。同时，所有受试者均表现出左右足底受力不均一的现象。其中，青年组男性右脚足底压力明显小于左脚，而青年组女性均显示出右脚足底压力大于左脚的情况(P< 0.05)。中年组男性和女性左脚的足底压力在30%~80%最大随意肌力拉力负荷下变化不大，但在100%最大随意肌力拉力负荷下明显减小(P < 0.05)。说明年龄和性别对不同拉力负荷下人体足底压力均有影响。

Plantar pressure distribution in a sitting position under different tensile loads of the upper limbs

BACKGROUND:Plantar pressure measurement has been widely used in biomechanical gait studies, which mainly concentrated on time features and plantar pressure distribution of people at normal walking or wear different kinds of shoes. OBJECTIVE:To explore the plantar pressure distribution in a sitting position under different tensile loads of the upper limbs.  METHODS:Plantar pressure distribution signals of 40 sitting subjects with different tensile load were recorded using Seat 16/53 mFLEX test system. The plantar pressure distribution of different age and gender under 30%, 50%, 80%, and 100% maximal voluntary contraction (MVC) conditions were analyzed. RESULTS AND CONCLUSION:Under different tensile loads, the plantar pressure value of young male was obviously higher than that of females (P < 0.05). But, the differences were not significant in middle-aged group (P > 0.05). Regardless of gender differences, all participants were shown inhomogenous stress around the plantar. In different load, youth male right plantar pressure was smaller than left, but the young female’s right plantar pressure was significantly greater than the left (P < 0.05). The left plantar pressure of the middle-aged group changed little at 30-80% MVC, but the difference was obviously decreased in 100% MVC (P < 0.05). The results demonstrated that both age and sex affect human plantar pressure changes under different tensile loads.