太极拳对老年人心肺机能的影响   总被引：16，自引：0，他引：16  

梁永文 《体育学刊》2001,8(4):64-65

通过系统观察、测试部分长年参加太极拳练习者和无训练者在完成定量负荷运动前后心肺功能指标变化,发现长期进行太板拳练习的老年人心脏泵血功能、心肌收缩机能、肺活量均显著优于普通人,表明长年从事太极拳运动对促进老年人心肺功能的改善具有积极作用,为老年人参加太极拳运动提供了可靠的实验依据.  相似文献   

避暑山庄宫墙的历史变迁     

王嘉宁 《承德职业学院学报》2005,10(4):90-91

避暑山庄宫墙始建于康熙年间,宫墙长近十公里,又称虎皮宫墙.是避暑山庄不可分割的重要组成部分.  相似文献   

对不同项群运动员运动负荷前后左心室舒张功能的观察   总被引：2，自引：0，他引：2  

宋信勇  周全  张维珂  杨俊峰 《北京体育大学学报》2003,26(1):43-44

为了评价不同项群运动员左心室舒张功能,对12名耐力项目运动员和12名速度力量项目运动员12min前后二尖瓣血流频谱进行了检测。结果表明:12min跑后耐力组血流速度积分和E/A明显减小,速度力量组血流速度积分、E峰值和E/A减小十分明显,A峰值减小明显,两组运动员血流速度积分、E峰值和E/A存在显著差异。说明,耐力组左心室舒张主动松驰及被动充盈能力均好于速度力量组。  相似文献   

动态运动诱发腰部脊竖肌疲劳过程中sEMG信号变化特征   总被引：17，自引：1，他引：16  

王健 《中国体育科技》2001,37(4):9-11

本研究的目的在于观察动态运动诱发腰部脊竖肌疲劳过程中sEMG信号线性分析指标MPF和非线性分析指标Lempel-Ziv复杂度和近似熵的动态变化规律，确定能够较好地运用于脊竖肌功能评价的sEMG指标。研究结果表明，动态运动过程中，腰部脊竖肌sEMG信号的MPF和Lempel-Ziv复杂度均呈明显的线性规律下降；70%的受试者的近似熵呈先升后降型变化;以MPF下降来预测腰部脊竖肌功能水平的外部效度优于Lempel-Ziv复杂度。研究结果提示，sEMG信号的上述变化可能是神经肌肉系统自组织调节活动的表现。  相似文献   

散步对中老年高级知识分子心脏功能影响的追踪分析     

黄红梅  刘永晖 《体育科学研究》2004,8(4):41-44

对采用散步作为锻炼手段的40名中老年高级知识分子的心脏功能指标进行追踪测试，显示散步可使中老年高级知识分子的PR、HOV、HOI降低；SV、SI、VPE、EWK升高；而对于CO、CI、LVWI的影响较小。提示坚持散步对提高中老年高级知识分子的心脏功能有较好的作用。  相似文献   

高频心电图和频谱心电图的进展及其在体育运动中的应用   总被引：1，自引：0，他引：1  

李爽 《成都体育学院学报》1995,21(4):67-70

心电图高频成分分析以及心电信号的频谱分析，是近年来在国内外发展的一种新型心电检测技术，尤其是９０年代初此种技术研究临床医学中发展甚速，已形成了一种全新的无创技术。笔者综述了此技术之历史沿革和目前进展，尤其是在体育运动中的应用。  相似文献   

基于深度强化学习的低轨卫星下行功率分配方案     

张华明  李强 《中国科学院大学学报》2022,39(4):543-550

当前的卫星资源分配方案大多为同步轨道卫星设计,针对低轨卫星的高动态特性,以及存在频率和功率资源受限的问题,提出一种基于深度强化学习的功率分配算法。首先对低轨卫星功率分配场景进行建模,引入一种时隙划分方案来简化低轨卫星的动态特性模型,进一步提出一种基于深度强化学习算法的功率分配策略,该策略通过调节单颗低轨卫星各个波束中子载波的功率值,降低同频干扰,能达到提升低轨卫星频谱效率的目的。仿真结果表明,所提算法能够在较短时间内收敛并达到稳定状态,在总功率一定的条件下,该方案能有效提升单颗低轨卫星的吞吐量,其频谱效率明显高于注水算法和Q学习算法。  相似文献   

Particle Penetration,Emission and Deposition in the Diocesan Museum in Udine,Italy to Assess Soiling of Giambattista Tiepolo’s Wall Paintings     

Chiara Bertolin  Marcin Strojecki  Roman Kozłowski 《文物保护研究》2018,63(5):326-328

  相似文献   

The deployment,training and teacher relationships of teaching assistants supporting pupils with autistic spectrum disorders (ASD) in mainstream secondary schools     

Wendy Symes  Neil Humphrey 《British Journal of Special Education》2011,38(2):57-64

Growing numbers of pupils with autistic spectrum disorders (ASD) are attending mainstream schools, and increasing numbers of additional staff are being deployed to support them. Recent research has cast doubt on the effectiveness of this support, by highlighting issues relating to deployment and training, and to relationships with class teachers. This study, conducted by Wendy Symes, who is a Research Associate at the University of Manchester, and Neil Humphrey, who is Professor of Education in the same university, interviewed 15 teaching assistants supporting pupils with ASD in four mainstream secondary schools in the north‐west of England to explore these issues. Analysis yielded several key findings. The majority of teaching assistants worked with just one pupil at a time and worked in a variety of lessons. Their role primarily involved helping pupils to stay focused and follow instructions. Many teaching assistants had no experience of ASD prior to starting their job. The amount of training received varied, but all felt that generic training about ASD was not helpful. A lack of time for joint planning with teachers was raised as a key concern. These findings are discussed in relation to the growing literature on inclusive education for pupils with ASD.  相似文献   

Spectroscopic methods for the analysis of celadonite and glauconite in Roman green wall paintings     

Ligia Maria Moretto  Emilio Francesco Orsega  Gian Antonio Mazzocchin 《Journal of Cultural Heritage》2011,12(4):384

One set of samples from wall paintings of the X^th Regio of Italy containing green colours was analysed exploiting different spectroscopic techniques, aiming to identify the pigments used. The possibility to distinguish between glauconite and celadonite, the most common green pigments used in such paintings, was of particular interest. Samples of celadonite from Monte Baldo and glauconite from Belgium were considered as standard materials for comparison. The results obtained using FTIR, EDS, AAS, Colorimetry, Raman and EPR spectroscopies were compared for the identification of the green pigments.  相似文献