Effect of minimal shoes and slope on vertical and leg stiffness during running  

极简鞋与坡度对跑步时垂直刚度和下肢刚度的影响（英文）

作　　者：Thibault Lussiana Kim Hbert-Losier Laurent Mourot 

机构地区：[1]Culture Sport Health Society and Exercise Performance, Health Innovation Platform, Franche-Comt University [2]Swedish Winter Sports Research Centree Health Sciences

出　　处：《Journal of Sport and Health Science》2015年第2期195-202,共8页运动与健康科学（英文）

基　　金：supported by the University of Franche Comte' (France) and the Exercise, Performance, Health, and Innovation platform of Besancon

摘　　要：Purpose： This study was designed to characterize and compare the vertical（kvert） and leg（kleg） stiffness measured during running in two different footwear conditions on negative, level, and positive slopes, using kinematic data only.Methods： Fourteen male recreational runners（age 23.4 4.4 years, height 177.5 5.2 cm, and body mass 69.5 5.3 kg） were tested on 2separate days within 1 week. At each session, subjects ran seven 5-min trials on a treadmill at 10 km/h, interspersed with 5 min of sitting passive recovery. Each trial was performed on a different slope gradient, ranging from 8%（downhill） to t8%（uphill）, assigned in a random order.Furthermore, each subject ran one 5-min trial wearing minimal shoes（MS） and the subsequent trial wearing traditional shoes（TS） in a counterbalanced randomized order ensuring that each slope was ran once in MS and once in TS. Kinematic data were collected using a photocell measuring system and high-speed video camera, with kvertand klegstiffness being calculated from these data.Results： Leg compression, contact times, and vertical displacement of the center of mass during running were significantly smaller in MS compared to TS across all slopes. In the two footwear conditions, step frequency significantly increased with a（positive） increase in slope.Kinematic analyses indicated that klegwas greater when running in MS than TS and this between-footwear difference remained similar across slopes. On the contrary, kvertdid not change on the basis of footwear, but increased with positive increases in slope.Conclusion： This study showed that kvertand klegduring running respond differently to change in footwear and/or slope. These two stiffness measures can hence provide a unique insight on the biomechanical adaptations of running under varying conditions and their respective quantification may assist in furthering our understanding of training, performance, and/or injury in this sport.目的:采用运动学数据描述和比较传统跑鞋和极简鞋在下坡、平坡和上坡跑步时对垂直刚度和下肢刚度的影响。方法:受试者为14名男性业余跑步者(年龄23.4±4.4岁,身高177.5±5.2 cm,体重69.5±5.3 kg)。要求一周内完成2次测试,每次测试时,受试者以10 km/h的速度在跑步机上进行7组(每组5 min)跑步,组间有5 min坐式休息。每组试验在-8%(下坡)到+8%(上坡)的范围内随机选择不同的坡度跑步。在每组试验中,要求所有受试者穿极简鞋跑步(5 min),随后再穿传统跑鞋跑步(5 min),以确保每个坡度各有一次随机平衡条件下的两种鞋对比试验。采用光电测试系统和高速摄像机采集运动学数据,计算出垂直刚度和下肢刚度。结果:在不同坡度跑时,极简鞋组的下肢压缩、触地时间和质心垂直位移均明显小于传统跑鞋组。随着倾斜角度增加,两组鞋的步频均显著增大。运动学分析显示,在相似的坡度跑时,极简鞋组的下肢刚度高于传统鞋组,在垂直刚度上两组鞋并无差异,但均会随着坡度的增加而增加。结论:不同的鞋和(或)坡度能对跑步时垂直刚度和下肢刚度产生不同影响。本研究采用两种刚度的测量方法,为理解不同条件下跑步的生物力学适应提供了独特视角。同时,通过量化各种刚度能进一步加深理解跑步者的训练、运动表现和损伤。

关 键 词：INCLINE Minimal shoes Running Spring-mass model STIFFNESS 

分 类 号：G804.6[文化科学—运动人体科学]