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1.
探讨憋气对脑血流速度的影响。方法:在憋气时及其先前的休息期,对20名正常的大学生运动员用经颅多普勒(TCD)监测其左侧大脑中动脉血流速度的变化.结果:憋气早期脑血流速度显著性增加,憋气中期,脑血流速度显著性减小,憋气后期,脑血流速度有所回升,但仍显著低于基线期测定值。结论:憋气可降低脑血流速度和大脑灌注压。  相似文献   

2.
探讨身体成分与脑血流速度(Cerebral Blood Flow Velocity,CBFV)的关系,以便揭示体脂对CBFV的影响。方法:以10名男大学生为实验对象,应用经颅多普勒技术检测了其安静时的大脑中动脉血流速度和采用In Body身体成份分析仪测试了其身体成分,然后对CBFV和身体进行了相关分析。结果:大脑中动脉收缩期峰速度(Vp)、舒张期末峰速度(Vd)和平均峰速度(Vm)分别与其体脂、体脂百分数和体重指数(BMI)呈显著负相关;而大脑中动脉的搏动指数(PI)分别与体脂百分数和BMI呈显著正相关。结论:体脂对CBFV有显著的负面影响,体脂增多,CBFV降低。  相似文献   

3.
优秀男子龙舟队员坐姿与高姿划桨技术动作的运动学分析   总被引:1,自引:0,他引:1  
采用文献资料法、平面录像解析法、数理统计法,对优秀男子龙舟队员所采用的坐势与单腿跪势两种划桨姿势进行平面拍摄,利用爱捷解析系统对两种姿势的录像进行解析,对所得数据进行统计分析.通过两种姿势中运动员桨划水速度变化、划水距离等因素的变化对船速的影响等方面进行运动学分析,通过分析得出两种姿势的优缺点.以便在比赛中更合理的使用不同姿势.  相似文献   

4.
目的:利用运动生物力学方法研究内外部干扰范式对3~8岁儿童站立姿势控制的影响,旨在揭示儿童早期静态站姿稳定性的干扰效应和年龄特征,充实姿势控制研究的理论内容与框架。方法:共纳入受试者182人。运用Kistler测力台采集压力中心(center of pressure,COP)数据;运用BTS表面肌电测试系统采集肌电数据。设置内部干扰(快速举臂范式)和外部干扰(落球试验)范式进行研究,在不同干扰范式下,分别采用闭眼、振动脚踝及同时闭眼和振动脚踝的测试方式分别代表视觉、本体感觉和前庭觉为主导的感官条件;采用重复测量方差分析法比较不同感官条件和年龄对姿势控制的影响。结果:1)在内部干扰下,闭眼振动的COP位移大于其他3种感官条件(p<0.05);随年龄增长,三角肌、肱三头肌、腹肌和竖脊肌的预期性姿势调节(anticipatory postural adjustments,APAs)强度呈线性增大趋势。2)在外部干扰范式下,闭眼条件下的COP位移出现最大值(p<0.05);随年龄增长,腹肌和外侧腓肠肌的APAs强度呈线性增大趋势。结论:3~8岁儿童的姿势控制能力受到不同干扰条件和年...  相似文献   

5.
本文测试了21名18~23岁的受试者在进行亚极量运动时,其大脑中动脉的血流速度在不同时刻的数值,以研究运动对脑血流速度的影响。结果表明运动可使血流速度增快且与运动强度有关,其中以收缩期最大流速的变化最为明显。在运动结束后2~3min,血流速度可恢复到安静时的水平,同时发现运动时心率的变化与血流速度的变化有一致性。  相似文献   

6.
目的:分析姿势控制训练对冰球运动员加速能力和滑行能力的影响。方法:募集专业体育院校18名冰球运动员,随机分为姿势控制训练组(实验组)9人,非姿势控制训练组(对照组)9人,进行为期8周的训练。实验组控制异常动作,规定相应动作节奏,进行姿势控制训练;对照组采用相同训练量和强度的练习方法,受试者自选身体姿势。训练结束后选取相关项目对实验组和对照组进行测试,统计分析测试结果,比较训练前后加速和滑行能力指标变化。结果:8周训练后,实验组30 m加速跑、30 m滑行、5×54 m折返滑行测试成绩均显著性提高(P<001),立定三级跳未出现显著性变化;对照组各项指标未出现显著性变化;组间比较,30m加速跑、30 m滑行、5×54 m折返滑行实验组成绩均显著优于对照组(P<001)。结论:8周姿势控制训练显著提升了冰球运动员的加速能力和滑行能力,陆上姿势控制训练效果可较好迁移至冰上,对冰球运动员专项体能训练和成绩提高具有指导借鉴意义。  相似文献   

7.
根据跳远起跳着板时的人体运动特点,运用多刚体模型,初步研究人体的不同姿势踏板对跳远距离的影响,以寻找最佳的起跳着板姿势。  相似文献   

8.
目的:分析世界优秀女子高尔夫球员挥杆技术动作中部分技术动作对整体挥杆技术的影响,为我国高尔夫运动的科学训练提供理论支持和帮助。方法:采用二维录像解析法获取2019年乐卡克北京女子精英赛部分优秀参赛球员1号木杆准备姿势技术及挥杆技术动作中的部分参数数据,并进行分析研究。结果:①准备姿势时膝关节角度、踝关节角度、膝臀线与臀颈线夹角、臀颈线与右臂夹角4个角度两两之间均具有显著相关性(P<005)。②上杆9点钟时球杆与左臂夹角和准备姿势时膝关节角度、踝关节角度、臀颈线与右臂夹角、球杆与手臂夹角4个角度之间均具有显著相关性(P<005),上杆9点钟时球杆与左臂夹角和膝关节角度、踝关节角度呈负相关。③击球瞬间杆颈角度和准备姿势时杆颈角度具有显著相关性(P<005),准备姿势时杆颈角度比击球瞬间杆颈角度小568±2266°。结论:在准备姿势部分,教练应综合考虑单个角度改变所带来的整体变化;通过调整球员准备姿势,改变上杆的挥杆半径,为下杆储蓄更多能量,以改善击球效果;击球瞬间杆颈角度与准备姿势时杆颈角度并不一致,这是在教学训练中急需纠正的一点。  相似文献   

9.
摘要:目的:比较以同一步速3种步频行走时乳房不同支撑状态对人体姿态和乳房运动学参数的影响,为女性运动及运动文胸设计与选择提供建议参考。方法:12名C罩杯女性分别在穿着运动文胸或裸胸状态以3种步频在跑步机上行走,使用红外光点运动捕捉系统(200 HZ)采集躯干姿态和乳房的运动学参数。结果:穿着运动文胸状态躯干屈曲角幅度(P=0.042)、躯干扭转角(P=0.015)幅度和乳房各点位移(P<0.001)、速度(P<0.001)显著小于裸胸状态。步频显著影响躯干屈曲角及扭转角的运动范围(P<0.05),慢步频的乳房各点位移幅度较正常步频及快步频大(P<0.05),快步频的垂直方向速度变化明显较其他两步频大(P<0.05)。回归分析表明躯干扭转角与乳房下点左右方向位移幅度正相关,躯干屈曲角运动幅度与乳房内点垂直方向位移幅度正相关。结论:乳房不同支撑状态影响乳房运动位移,乳房位移幅度会影响躯干运动范围。相同速度不同步频运动时,慢步频的躯干运动幅度和乳房位移幅度最大,快步频乳房各点垂直方向速度较大。  相似文献   

10.
对我国优秀女子标枪运动员最后用力过程中左腿技术的研究   总被引:12,自引:2,他引:10  
对我国优秀女子标枪运动员最后用力过程中左腿的动作技术进行了定量研究。结果表明:交叉步右脚着地后,左膝水平速度与重心水平速度显著相关(γ=0.7302,P<0.01),加速左腿的前摆有助于重心水平速度的回升;影响标枪出手速度的灰色关联排序中首要因素是标枪离手时左膝角,说明左腿迅速而充分的蹬伸对出手速度起着重要的影响作用。  相似文献   

11.
Since the late 1960s,culture has been considered tighter with communication.Culture IS based on the community of communication.Communication involves people and their environment.Thus culture is an important factor in communication.Today with modem economic and technological development,intercultural communication is mole important than ever before. When people from different cultural background communicate with each other,their social stereotype pattern of behavior, their habits of language and thought differ from one another,because these are the possible factors that affect intercultural communications.Culture norms also change,culture may be transferred as signs but we have to study and understand the above carefially.  相似文献   

12.
The article introduces Shakespeare's tragedy "Hamlet".Hamlet wants to revenge for his father.But when the opportunity is coming,he delays his revenge.The passage analyzes the causes of his delay from Hamlet's characters.  相似文献   

13.
The thesis mainly discusses the character of the heroine in Charlotte Brontes famous novel "Jane Eyre". There are three major parts-introduction,analysis which is the main body of the thesis,and conclusion.Jane Eyre,the heroine,is a new woman image who requires independence equality and freedom.The thesis just analyzes Janes these rebellious characters through four peroods of her experiences.First,in her childhood,she has shown her rebellious spirit.As an orphan,Jane suffers a lot of misery.Not only her aunt treats her cruelly,her cousins despise her,but also do servants have a prejudice against her.In Janes immature heart, she is unwilling to bear ill treatment.She rebels them bravely.Second,when she studies at Lowood,her rebellious spirit is exposed furtherly.Her view doest stay in Mrs Reeds,instead turns to the whole society.She makes hypocrisy of so-called charity to be discovered completely.At the same time,she declares her independent,equal rebellious thought to her friend-Helldn who endures oppression willingly.Third,she,as a governess in Thornfield Hall falls in love with Rochester-her master.During this period,her thought grows into maturity.Thought she loves him passionately,she never loses her dignity and independence for him.When she knows his mad wife still lives,she makes up her mind to leave him.For she doesnt want to become his mistress.Fourth,her refusal of St Johns proposal of marriage depicts Janes character.She knows John does not love her at all and his purpose of marriage is only to perform his great task missionary.Jane does want to become a sacrifice.She breaks traditional morality,then she goes back to Rochester.  相似文献   

14.
The context of a word consists of the other words surrounding it and the situation in which it is used.When we come across a new word in our reading,instead of looking it up in a dictionary for its definition,we can guess its meaning from its context.  相似文献   

15.
当代中国武术经历了时代的沧桑和变迁,在历经了文化和历史的发展与洗礼之后,依然发展、繁衍至今。在这样一个漫长的过程中,伴随着以社会环境和社会人群价值取向为主的变迁与变化,当代中国武术的发展与当代社会的发展正逐渐的呈现出某些相背离和不和谐的表象。通过研究,我们发觉中国武术中原本一些内在的东西正在不断的被遗忘,正在不断的流逝。本文试从中国武术在当代发展中的问题境域入手,解读中国武术在当今世界和社会中存在的一些问题,希望能够从中找到中国武术发展的"合法性"或"合时性"的内在依据,以挺立中国武术的脊梁。  相似文献   

16.
Introduction Whatisculture?Toputitsimply,culturemeansthe totalwayoflifeofaperson.Thissimpledefinitionimplies thatculturereferstothepattersofcustoms,traditions,socialhabits,values,beliefsandlanguageofasociety.As cultureissoinclusive,itincludesvirtuallyeverythingthat agroupofpeoplethink,say,doandmake.Followingthedefinitionofsociologists,theterm culturereferstothetotalpatternofbeliefs,customs,institutions,objects,andcharacterizesthelifeofhuman community.“Cultureconsistsofallthesharedproductsof …  相似文献   

17.
"Midnight"is a poem written by Archibald·Lampman,a Canadian poet,who loved nature very much,but his poor health prevents him from being very active in the outdoor life.So he is often the quite,thoughtful observer of nature in his poems.This article mainly talks about how to appreciate the poem in the following aspects:word selecting,rhyme,sentence structure and atmosphere.After reading this poem,we cannot get rid of the air of horror and mystery."Midnight" reveals another aspect of the nature:wild,rough and unknown.There is something else in the nature that can awe human beings even though we don't know what it is.  相似文献   

18.
Chapter Ⅰ Introduction Sitting in the rocking chair,Carrie dreams her future.This is the deep impression the novel"Sister Carrie"gives us,which is written by Theodore Dreiser(1871-1945),the great American realism writer.  相似文献   

19.
运用临场观察统计法、访谈法、文献资料法以及归纳法等研究方法,对现阶段国内青少年足球守门员防守技术运用情况进行统计与分析研究.结果表明:判断反应与选位能力不足是青少年守门员防守技术失误的主要原因,预判失误与技术粗糙以及缺乏自信等导致青少年守门员对抗条件下难以有效发挥位置优势,强干扰情况时出击争夺球失误多,重视反应训练和提高接球动作质量要求是提高青少年守门员技术水平的重中之重.  相似文献   

20.
提高体校学生的语素质的主要途径是课堂教学。体校语教师在教学过程中必须根据学生身心特点.设置合理的结构模式,以便顺利实现教学目标。  相似文献   

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