Effects of changing speed on knee and ankle joint load during walking and running     

Ana Cristina de David  Felipe Pivetta Carpes  Darren Stefanyshyn 《Journal of sports sciences》2015,33(4):391-397

Joint moments can be used as an indicator of joint loading and have potential application for sports performance and injury prevention. The effects of changing walking and running speeds on joint moments for the different planes of motion still are debatable. Here, we compared knee and ankle moments during walking and running at different speeds. Data were collected from 11 recreational male runners to determine knee and ankle joint moments during different conditions. Conditions include walking at a comfortable speed (self-selected pacing), fast walking (fastest speed possible), slow running (speed corresponding to 30% slower than running) and running (at 4 m · s^?1 ± 10%). A different joint moment pattern was observed between walking and running. We observed a general increase in joint load for sagittal and frontal planes as speed increased, while the effects of speed were not clear in the transverse plane moments. Although differences tend to be more pronounced when gait changed from walking to running, the peak moments, in general, increased when speed increased from comfortable walking to fast walking and from slow running to running mainly in the sagittal and frontal planes. Knee flexion moment was higher in walking than in running due to larger knee extension. Results suggest caution when recommending walking over running in an attempt to reduce knee joint loading. The different effects of speed increments during walking and running should be considered with regard to the prevention of injuries and for rehabilitation purposes.  相似文献   

跆拳道后旋踢技术动作的运动学特征分析          下载免费PDF全文

杨小芳 《河北体育学院学报》2016,30(3):81-85

采用三维高速摄像技术和运动生物力学原理,对后旋踢技术身体重心移动、动作所用时间、踝关节角度、膝关节角度和髋关节角度的运动学特征进行比较分析,得出结论:踢击腿在离地瞬间身体重心要快速向回旋方向移动;踢击腿膝关节最大程度弯曲,以缩短动作时间、加快踢击速度;踢击腿髋关节只有最大程度地弯曲,弯曲的膝关节才能快速展开;踢击腿的髋关节最大程度弯曲再打开时,踝关节能快速鞭打;支撑腿弯曲后在踢击腿踢出的瞬间,髋关节开始伸展,将对打击高度产生影响;踢击腿膝关节和髋关节最大程度弯曲时能增加击打力度.  相似文献   

业余足球运动员踝关节损伤的原因及治疗     

张扬  王太林 《体育科技》2011,32(4):65-67

通过查阅相关资料,并参与山西省太原市业余足球比赛若干场次,对在比赛中踝关节急性损伤的运动员进行各期治疗并进行对比,观察疗效。结果显示：业余足球运动员踝关节损伤后未处理的,痊愈率为17％;只进行前期处理的,痊愈率为50％;进行前期、中期、后期治疗的,痊愈率为100％。  相似文献   

Preparation time influences ankle and knee joint control during dynamic change of direction movements     

Patrick Fuerst  Albert Gollhofer  Dominic Gehring 《Journal of sports sciences》2017,35(8):762-768

The influence of preparation time on ankle joint biomechanics during highly dynamic movements is largely unknown. The aim of this study was to evaluate the impact of limited preparation time on ankle joint loading during highly dynamic run-and-cut movements. Thirteen male basketball players performed 45°-sidestep-cutting and 180°-turning manoeuvres in reaction to light signals which appeared during the approach run. Both movements were executed under (1) an easy condition, in which the light signal appeared very early, (2) a medium condition and (3) a hard condition with very little time to prepare the movements. Maximum ankle inversion angles, moments and velocities during ground contact, as well as EMG signals of three lower extremity muscles, were analysed. In 180°-turning movements, reduced preparation time led to significantly increased maximum ankle inversion velocities. Muscular activation levels, however, did not change. Increased inversion velocities, without accompanying changes in muscular activation, may have the potential to destabilise the ankle joint when less preparation time is available. This may result in a higher injury risk during turning movements and should therefore be considered in ankle injury research and the aetiology of ankle sprains.  相似文献   

滑升模板中的支撑杆加固     

李德玉 《鸡西大学学报》2005,5(1):64-65

支撑杆在滑模中所起的作用是重大的，施工时由于模板脱模的时间、混凝土振捣的质量、以及振捣器插入的深度、钢筋保护层厚度不匀等都会影响砼的质量问题或引发安全事故。  相似文献   

汽车电源保护系统的设计 ——以多功能通信车为例     

王磊 《安阳工学院学报》2019,18(2):24-27

结合多功能通信车工作电源的特点及使用过程中的安全要求,在分析漏电保护器的工作原理和功能基础上,设计多功能通信车车载电源漏电保护器样品。实验表明,经过调试、运行及根据测量点电压值反馈的结果,该多功能通信车上所设计的漏电保护器,能够在漏电、过流、欠压、过压情况下做出相应指示报警,达到漏电保护、非正常工作状态显示的目的。  相似文献   

艺术体操专选生踝关节损伤原因和预防     

杨彩虹 《茂名学院学报》2007,17(6):78-81

由于艺术体操是一项高立踵的运动项目,其动作与踝关节密切相关,所以踝关节损伤是艺术体操专选生中最为常见、最为普遍的一种运动损伤。对104名艺术体操专选学生进行了访问、问卷调查,并对问卷调查的结果进行了统计;同时,对艺术体操运动中踝关节损伤的部位、损伤的原因、损伤的预防及伤后的恢复训练等进行了探讨。  相似文献   

急性踝关节扭伤治疗方法的对照研究     

罗选初 《湖南城市学院学报》2006,27(3):106-107

对急性踝关节扭伤的治疗,已有较多的研究和实践。对急性踝关节扭伤治疗需与现行的常规治疗方法进行对照,并选择可客观测量的特征性效应指标。只有这样,才能对各种治疗方法的意义和价值作出客观准确的评价,提高临床科研和治疗水平。  相似文献   

大学体育院系普修跨栏跑教学中踝部损伤的原因及预防     

钱振宇  姚彬彬  刘俊 《体育科技文献通报》2007,15(1):71-72,83

本文通过调查大学体育院系普修跨栏跑运动中,踝部发生损伤的机率及其损伤发生的阶段。从踝部的解剖结构特点,分析踝部运动损伤的原因,从中找出规律,并针对原因提出一些预防的方法,为教师在跨栏跑教学训练中减少学生踝部运动损伤提供理论依据。  相似文献   

我国大学生运动损伤调查及病因分析   总被引：30，自引：0，他引：30  

石大玲  章爱珍 《武汉体育学院学报》2004,38(3):52-53,55

对我国30多所高校不同年级的学生进行调查,以问卷调查和查阅医务档案相结合的方法,调查内容包括性别、损伤时间、天气、运动类型、损伤机制、影响因素、治疗手段、治疗经费及愈后情况。对调查结果进行统计学分析,找出造成运动损伤的原因,即:髌骨劳损和踝关节损伤患病率最高,提出预防措施。  相似文献