Ankle and knee kinetics between strike patterns at common training speeds in competitive male runners     

Daniel Kuhman  Daniel Melcher 《European Journal of Sport Science》2016,16(4):433-440

The purpose of this study was to investigate the interaction of foot strike and common speeds on sagittal plane ankle and knee joint kinetics in competitive rear foot strike (RFS) runners when running with a RFS pattern and an imposed forefoot strike (FFS) pattern. Sixteen competitive habitual male RFS runners ran at two different speeds (i.e. 8 and 6?min?mile^?1) using their habitual RFS and an imposed FFS pattern. A repeated measures analysis of variance was used to assess a potential interaction between strike pattern and speed for selected ground reaction force (GRF) variables and, sagittal plane ankle and knee kinematic and kinetic variables. No foot strike and speed interaction was observed for any of the kinetic variables. Habitual RFS yielded a greater loading rate of the vertical GRF, peak ankle dorsiflexor moment, peak knee extensor moment, peak knee eccentric extensor power, peak dorsiflexion and sagittal plane knee range of motion compared to imposed FFS. Imposed FFS yielded greater maximum vertical GRF, peak ankle plantarflexor moment, peak ankle eccentric plantarflexor power and sagittal plane ankle ROM compared to habitual RFS. Consistent with previous literature, imposed FFS in habitual RFS reduces eccentric knee extensor and ankle dorsiflexor involvement but produce greater eccentric ankle plantarflexor action compared to RFS. These acute differences between strike patterns were independent of running speeds equivalent to typical easy and hard training runs in competitive male runners. Current findings along with previous literature suggest differences in lower extremity kinetics between habitual RFS and imposed FFS running are consistent among a variety of runner populations.  相似文献   

Lower limb alignment characteristics are not associated with running injuries in runners: Prospective cohort study     

Luiz Carlos Hespanhol Junior  Aline Carla Araújo de Carvalho  Leonardo Oliveira Pena Costa 《European Journal of Sport Science》2016,16(8):1137-1144

There is conflicting evidence on the association between lower limb alignment characteristics and the incidence of running-related injury (RRI). Therefore, the primary aim of this study was to investigate the association between lower limb alignment characteristics and the incidence proportion of RRI in a convenience sample of recreational runners. A total of 89 recreational runners were included in this prospective cohort study. These participants had been running for at least six months and were injury-free at baseline. Lower limb alignment measurements were conducted in order to calculate lower limb discrepancy, Q-angle, subtalar angle and plantar index. All participants also answered a baseline and biweekly online surveys about their running routine, history of RRI and newly developed RRI over a period of 12 weeks. The prevalence of previous RRI and the 12-week incidence proportion of new RRI were calculated. Logistic regression analysis was performed to estimate the association between lower limb length discrepancy, Q-angle, subtalar angle and plantar ach index with the incidence proportion of RRI. The prevalence of previous RRI was 55.1% (n?=?49). The 12-week incidence proportion of new RRI was 27.0% (n?=?24). Muscle injuries and tendinopathies were the main types of RRI identified. The lower leg and the knee were the main anatomical regions affected. We did not find significant associations between lower limb length discrepancy, Q-angle, subtalar angle and plantar arch index and injury occurrence.  相似文献   

《家庭暴力防治法》立法问题研究     

邹艳晖 《鸡西大学学报》2007,7(1):57-59

目前,我国家庭暴力问题令人担忧,其中重要原因之一是我国现行法律在规制家庭暴力方面存在不足。应制定专门《家庭暴力防治法》,明确《家庭暴力防治法》在法律体系中的地位,明确家庭暴力举证的特殊要求,明确相关机构干预家庭暴力的责任,明确规定施暴者的法律责任,在立法时并对弱势群体有所倾斜。  相似文献   

工程承包投标的决策分析     

游学民 《襄樊职业技术学院学报》2004,3(2):88-89

利用决策树方法计算了在工程承包投标过程中各方案的期望值大小。并对投标风险进行了分析；利用回归分析分析了投标前投标费用的确定方法。  相似文献   

紫外线的应用、预报及其预防     

南景宇  岳建一 《河北北方学院学报(社会科学版)》2003,19(3):15-19

随着现代科学技术的进步,紫外技术已得到广泛应用和发展,人类对紫外线的认识越来越全面,对紫外线的预报和预防越来越重视,紫外线与人们日常生活的关系也越来越紧密。然而,在《大学物理》、《光学》等教程中却很少涉及有关紫外线方面的内容,文章力图向大家介绍有关这方面的情况。  相似文献   

注册会计师职业判断的运用研究     

刘春雨 《商丘职业技术学院学报》2006,5(4):47-48

新会计制度的颁布实施,增大了会计处理的选择空间。会计人员运用专业理论知识和实践经验进行职业判断的内容也有所增加,从而必然对审计人员的专业判断能力提出更高的要求。注册会计师的职业判断尤为重要,它贯穿于审计工作的全过程,具有广泛的应用范围。  相似文献   

风险认知与决策领域的研究现状分析   总被引：1，自引：0，他引：1  

杨刘敏 《内江师范学院学报》2007,22(3):56-58

风险决策是指决策者在面临两个或两个以上不确定的决策后果,尤其是在面对伴有负面结果的可能性时,所产生的复杂心理过程.对个体风险知觉的探究主要包括风险认知与风险偏好两个方面.风险决策常常涉及多个不确定性的负面结果.因此,个体所知觉到的风险情景也不会是单一的,对动态决策模型的研究成为决策科学发展的一个重要方向.  相似文献   

试论CPA的验资风险及风险防范     

冯丽敏 《郧阳师范高等专科学校学报》2004,24(3):104-105

从产生验资风险的原因着手,分析验资风险的防范措施,使我们认识到只有严格执行验资程序,保持应有的职业谨慎,不断提高执业能力,充分防范验资风险,才能使我国的CPA事业走上健康的发展道路。  相似文献   

植物组织培养中的玻璃化现象   总被引：8，自引：0，他引：8  

秦静远  王军利  王富容 《杨凌职业技术学院学报》2004,3(2):51-53

本文叙述了植物组织培养过程中，出现的玻璃苗解剖学特点、生理生化变化、形成原因及预防措施。  相似文献   

企业多元化经营战略     

李颖 《河北软件职业技术学院学报》2003,5(1):28-30

企业在进行多元化经营的过程中,要确定战略目标,认清经营风险,找出企业在进行多元化经营过程中出现的问题,认真分析影响多元化经营成败的因素,将核心竟争力作为企业多元化经营的根本依托。  相似文献