| （1.苏州大学 体育学院，江苏 苏州 215021；2.苏州外国语学校 体育组，江苏 苏州 215011） 摘 要：根据足弓高度指数选取9名高弓足学生为实验组和9名正常足学生为对照组，采用KISTLER三维测力台对两组受试者跑步时支撑阶段的力学控制特征进行分析。研究结果发现：1)垂直方向上，高弓足者着地时的冲击力峰值和第1载荷率显著高于正常足者(P﹤0.05)；推动力峰值和第2载荷率以及到达峰值的时间两组间差异无统计学意义(P﹥0.05)。2)前后方向上，高弓足者加速力峰值高于正常足者(P﹤0.05)，其它指标在两组间的差异无统计学意义(P﹥0.05)。3)内外方向上，高弓足者跑步时内外方向上力的最大值、最小值以及力值波动范围均高于正常足者(P﹤0.05)，其它指标两组间无统计学意义(P﹥0.05)。结果说明：1)高弓足者受到较高的冲击力(峰值)和载荷率，以及僵硬的足弓可能暗示了高弓足者着地时足弓缓冲震荡的能力降低，是造成高弓足损伤的重要原因之一；2)高弓足者与正常足者前后和内外方向上的差异性可能是造成高弓足损伤的潜在因素之一，这些差异性可能与足弓僵硬、下肢肌肉活性较差以及肌肉做功的差异有关。总之，高弓足者在跑步支撑阶段对动力学控制能力较差，反映了高弓足与正常足者跑步时力学控制机制的不同。 |
MAO Xiao-kun1，ZHANG Qiu-xia1，LU A-ming1，WANG Guo-dong1，YANG Qian-qian2
| （1.School of Physical Education，Soochow University，Suzhou 215021，China；2.Group of Physical Education，Suzhou Foreign Language School，Suzhou 215011，China) Abstract: Based on foot arch height index, the authors selected 9 high arch foot students as the experiment group and 9 normal foot students as the control group, and used a KISTLER 3D force measuring platform to analyze the mechanical control characteristics of running of the two groups of testees at the supporting stage. Research results: 1) in the vertical direction, at landing, the peak vertical force and the first loading rate produced by the high arch foot testees are significantly greater than those produced by the normal foot testees (P<0.05); the differences in the peak driving force and the second loading rate as well as the time to peak between the two groups have no statistical significance (P>0.05); 2) ) in the anteroposterior direction, the peak accelerating force produced by the high arch foot testees is greater than that produced by the normal foot testees (P<0.05), the differences in other indexes be-tween the two groups have no statistical significance (P>0.05); 3) in the medial-lateral direction, the maximum value, minimum value and fluctuation range of the force produced by the high arch foot testees during running are greater than those produced by the normal foot testees (P<0.05), the differences in other indexes between the two groups have no statistical significance (P>0.05). The results indicate the following: 1) the high arch foot testees suf-fered a greater (peak) impact force and loading rate, and their stiff foot arch may hint that the decrease of their foot arch’s ability to absorb shocks at landing is one of the important causes for high arch foot injury; 2) the differences in the anteroposterior and medial-lateral directions between the high arch foot testees and the normal foot testees are probably one of the potential factors for causing high arch foot injury, these differences are probably related to foot arch stiffness, poor lower limb muscle activity and muscle work difference. In conclusion, high arch foot people’s ability to maintain kinetic control at the supporting stage during running is relatively poor, which reflects the differ-ences in the mechanical control mechanism between high arch foot people and normal foot people during running. |
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