浅析发展中的中国体育经纪市场

随着我国体育事业的蓬勃发展,随着我国体育职业化道路的阔步前进,体育经纪必将发挥越来越大的作用。本文着重讨论了体育经纪的作用、我国体育经纪的状况,并针对我国体育经济的现状提出了解决我国体育经纪问题的策略要求。     

关于首都体育学院武术留学生运动损伤成因的调查与分析

武术作为中华民族的优秀文化遗产,以它的博大精深吸引着越来越多世界各地的人们投身其中。近年来,外国留学生的武术运动技术水平提高很快,但同时也频频伴有损伤的发生,如何做好预防工作是我们应该高度重视的问题。采用文献资料法、问卷调查法、访谈法、数理分析法等方法,以首都体育学院的35名武术留学生为研究对象,通过对其运动损伤状况展开调查研究,分析造成损伤的主要原因有：技术动作不规范、专项素质没跟上、准备活动不充分、逞强好胜急于求成等,并在此基础上提出了预防措施：端正学习态度、做好准备活动、注重身体素质、规范技术动作、加强自我保护等,为今后留学生的武术教学和训练提供参考依据。     

补充谷氨酰胺在运动中的作用

谷氨酰胺(Gln)是人体内含量最丰富的氨基酸,在体内发挥着非常重要的作用,但是在很多应激状态下,谷氨酰胺的动态平衡会被打破.文章综述了补充谷氨酰胺在运动中所起的各种作用,提出在实践中可以通过适当补充谷氨硫胺来改善运动员的运动能力、免疫功能、情绪状况、运动技能的学习等.     

对我国优秀蹦床运动员运动损伤的调查与分析

运动损伤是严重影响运动员运动寿命的主要原因,也是影响蹦床项目可持续发展的主要障碍.运用问卷调查和访谈法对蹦床运动损伤的情况进行深入的调查与分析,探索蹦床项目的技术特点对运动损伤的影响程度;掌握我国蹦床运动员运动损伤发生的特征、易损伤的部位、导致损伤发生的时间、致伤动作以及影响损伤发生的因素,对于蹦床运动员预防损伤提供一定的参考资料和建议.     

体校武术专业学生常见运动损伤及预防

根据对武术专业学生的常见运动损伤调查分析，引起损伤的原因如下：(1)思想因素；(2)准备活动不足；(3)技术上的错误；(4)自身素质差；(5)场地设备不良等。在分析原因的基础上提出建议。     

超微结构变化及其与肌肉疲劳、损伤的关系

近年来有大量文献综述讨论这一专题。运动时肌肉损伤使输出功率减低,肌肉疲劳。运动后即刻超微结构变化最常见的表现涉及肌小节损伤,肌质网和线粒体颗粒肿胀。超微结构的变化程度参与肌肉疲劳的发生现未知。最可能的机制涉及直接抑制肌质网Ca~(2 )释放通道和在某种场合因兴奋收缩偶联阻断,但钙如何促使细胞损伤也仍未解决。钙激活蛋白酶类,磷脂酶A可能促进肌肉损伤,由于肌膜和亚细胞器膜结构降解,力竭运动后自由基增加,导致脂质过氧化增加和肌细胞完整性丧失。自由基能促进疲劳尤其显得重要,自由基防护剂可预期在一定程度上保护肌细胞。     

福建省竞技体操发展的分析与思考

通过文献资料法、调查法和专家访谈法等研究方法，针对福建省竞技体操训练中存在的训练条件差、教练员水平有待提高、后备力量不足、竞训体制不舍理等问题，进行深入分析并提出相应的建议。     

Effects of forward trunk lean on hamstring muscle kinematics during sprinting

This study aimed to investigate the effects of forward trunk lean on hamstring muscle kinematics during sprinting. Eight male sprinters performed maximal-effort sprints in two trunk positions: forward lean and upright. A three-dimensional musculoskeletal model was used to compute the musculotendon lengths and velocity of the biceps femoris long head, semitendinosus, and semimembranosus muscles during the sprinting gait cycle. The musculotendon lengths of all the three hamstring muscles at foot strike and toe-off were significantly greater during the forward trunk lean sprint than during the upright trunk sprint. In addition, a positive peak musculotendon lengthening velocity was observed in the biceps femoris long head and semimembranosus muscles during the late stance phase, and musculotendon lengths at that instant were significantly greater during the forward trunk lean sprint than during the upright trunk sprint. The present study provides significant evidence that a potential for hamstring muscle strain injury involving forward trunk lean sprinting would exist during the stance phase. The results also indicate that the biceps femoris long head and semimembranosus muscles are stretched during forward trunk lean sprinting while contracting eccentrically in the late stance phase; thus, the elongation load on these muscles could be increased.     

Increasing plantarflexion angle during landing reduces vertical ground reaction forces,loading rates and the hip’s contribution to support moment within participants

The ankle joint’s role in shock absorption during landing has been researched in many studies, which have found that landing with higher amounts of plantarflexion (PF) results in lower peak vertical ground reaction forces and loading rates. However, there has not yet been a study that compares drop landings within participants along a quantitative continuum of PF angles. Using a custom-written real-time feedback program, participants adjusted their ankles to an instructed PF angle and dropped onto two force platforms. For increasing PF, peak ground reaction force and peak loading rate during weight acceptance decreased significantly. The hip’s contribution to peak support moment decreased as PF at initial contact increased up to 30°. The ankle and knee contributions increased over this same continuum of PF angles. There appears to be no optimal PF angle based on peak ground reaction force and loading rate measurements, but there may be an optimum where joint contributions to peak support moment converge and the hip moment’s contribution is minimised.