对老年人骨矿含量、体成分和肌力的特征研究   总被引：9，自引：1，他引：8  

池建  张一民  李果 《北京体育大学学报》1997,(3)

选取北京市５５岁以上老年人８６名进行研究，结果发现５５岁以上老年人骨矿含量、体成分和最大肌力存在明显的性别差异。骨矿含量随着年龄增加而逐年降低，女性下降的幅度明显高于男性。骨矿含量与体脂百分比呈明显的负相关，与体重，身体密度、瘦体重和最大肌力呈正相关，与肌肉耐力无明显的关系。  相似文献   

太极拳锻炼对原发性骨质疏松症患者骨密度及骨代谢的影响   总被引：3，自引：0，他引：3  

宋桦 《体育学刊》2008,15(11)

观察太极拳锻炼对原发性骨质疏松症患者骨密度及骨代谢的影响。将原发性骨质疏松症患者40例随机分成对照组和太极拳组，实验前后对两组患者骨密度值、血清骨钙素（BGP）、碱性磷酸酶（ALP）以及骨痛的变化情况进行比较分析，实验结果发现：实验后太极拳组与对照组的腰椎骨、股骨、颈骨密度差异呈显著性；BGP、ALP的比较差异分别呈显著性；骨痛积分两组间比较差异具有显著性。结果说明，太极拳锻炼是防治原发性骨质疏松症的有效方法，值得推广应用。  相似文献   

武术套路运动对女大学生骨密度和基本体质指标的影响     

张丽  王美月 《体育科技文献通报》2008,16(12):91-92

目的：探讨武术套路运动对普通女大学生骨密度和基本体质指标的影响，并分析其原因。方法：以成都体育学院健康女大学生20名作为研究对象，测量运动组（武术系武术套路学生）和对照组（外语系较少参加运动学生）的骨密度和体重、瘦体重、体重指数等基本体质指标，并将结果进行分析比较。结果：与对照组相比，运动组的超声衰减、超声声速和骨强度指数均较高，并具有非常显著性的差异；运动组的各项体质指标值均高于对照组，其中体重指数的差异具有非常显著性水平。  相似文献   

健身气功·八段锦对中老年人血脂的影响   总被引：1，自引：0，他引：1  

周小青  曾云贵  杨柏龙  王安利 《北京体育大学学报》2007,30(6):795-797

研究哈尔滨市健身气功·八段锦练习者75天锻炼前后血脂指标的影响,结果表明,习练健身气功·八段锦后,老年男、女的血清TC浓度显著低于锻炼前;老年男、女锻炼后的血清LDL浓度非常显著低于锻炼前;中年男、女锻炼后的血清吼浓度非常显著高于锻炼前.通过结果分析对健身气功·八段锦的健身效果进行客观评价,使"八段锦"这一养生锻炼的形式更科学、更合理,并进一步提高其健身效果,为改善人民的健康水平发挥更大作用,为全民健身服务,为社会的政治稳定服务.  相似文献   

无限长掺杂Zn棱柱型硅纳米管的理论研究     

李英 《商洛学院学报》2011,25(4)

运用密度泛函方法在(U)B3LYP/LanL2DZ水平上研究了无限长四棱柱、五棱柱和六棱柱型掺杂锌的硅纳米管的几何结构、电荷布局、能级和电偶极矩。计算结果表明,无限长四、六棱柱型Zn-Si纳米管的最低能结构均保持着基本的管状结构,五棱柱型的则畸变严重。五棱柱和六棱柱型Zn-Si纳米管的最低能结构的电子自旋多重态都为五重态,而四棱柱的为单重态。五棱柱型Zn-Si纳米管是这三种纳米管中热力学稳定性最强的。四、六棱柱型Zn-Si纳米管中电子从硅原子转向Zn原子,Zn原子充当电荷的受体,出现了电子反转现象。五棱柱型Zn-Si纳米管电子的转移方向比较复杂,Zn原子的位置不同,充当不同的电荷角色。两边的Zn原子是电荷的施体,而中间的则充当了电荷的受体。无限长掺杂Zn的五棱柱型硅纳米管的HOMO-LUMO能隙比较大,它的化学稳定性比较强。这三种纳米管呈半导体型。虽然这三种纳米管是极性的,但是五棱柱型的极性很弱。  相似文献   

Abdominal Obesity Associated with Elevated Serum Butyrylcholinesterase Activity,Insulin Resistance and Reduced High Density Lipoprotein-Cholesterol Levels     

Surapon Tangvarasittichai  Suthap Pongthaisong  Suwadee Meemark  Orathai Tangvarasittichai 《Indian journal of clinical biochemistry : IJCB》2015,30(3):275-280

Abdominal obesity (AO) has a strong correlation with cardiovascular disease and has been linked to Alzheimer’s disease and type 2 diabetes. We investigated the association between AO and elevated serum butyrylcholinesterase (BChE) activity, insulin resistance and the serum lipid profile, including triglyceride (TG), HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C) levels in AO and non-AO women subjects. A total of 500 AO subjects (age 49.1 ± 10.5 years), and 142 non-AO women subjects (age 49.9 ± 11.9 years) were enrolled for the general biochemistry tests, serum BChE, fasting insulin and homeostasis model assessment of insulin resistance (HOMA-IR). Body mass index, waist circumference, Blood pressure (BP), plasma glucose (Glu), triglyceride (TG), BChE, insulin, HOMA-IR were significantly higher and HDL-C levels were significantly lower in AO subjects (p < 0.05). Waist circumference was significantly correlated with BP, Glu, TG, BChE, insulin and HOMA-IR in AO subjects. Multiple logistic regression demonstrated that AO was associated with elevated BChE, HOMA-IR, hypertension and reduced HDL-C after adjusting for these variables. AO is associated with elevated BChE, insulin resistance, HT and reduced HDL-C. These may predict the development of type 2 diabetes mellitus and may be associated with cognitive disorder in the future, both are mediated through insulin resistance.  相似文献   

基于社会网络分析的微信朋友圈实证研究——以华中农业大学信息1003班为例     

付永升  邬凯伟 《情报探索》2015,(1):21-25

基于华中农业大学信息1003班30位同学问卷调查所得的数据,利用社会网络分析方法和UCINET软件,对信息1003班成员的微信朋友圈进行了中心性分析和凝聚子群分析,同时计算了整体网络密度。结果表明:班长、团支书或人缘好的同学在微信朋友圈的信息传播中拥有较高的"权利",即能够在较大程度上控制信息的流动;室友或有共同兴趣爱好的人很容易形成小团体;信息1003班成员通过微信朋友圈联系紧密。  相似文献   

Validation of two accelerometers to determine mechanical loading of physical activities in children     

Ursina Meyer  Dominique Ernst  Silvia Schott  Claudia Riera  Jan Hattendorf  Jacqueline Romkes 《Journal of sports sciences》2015,33(16):1702-1709

The purpose of this study was to assess the validity of accelerometers using force plates (i.e., ground reaction force (GRF)) during the performance of different tasks of daily physical activity in children. Thirteen children (10.1 (range 5.4–15.7) years, 3 girls) wore two accelerometers (ActiGraph GT3X+ (ACT), GENEA (GEN)) at the hip that provide raw acceleration signals at 100 Hz. Participants completed different tasks (walking, jogging, running, landings from boxes of different height, rope skipping, dancing) on a force plate. GRF was collected for one step per trial (10 trials) for ambulatory movements and for all landings (10 trials), rope skips and dance procedures. Accelerometer outputs as peak loading (g) per activity were averaged. ANOVA, correlation analyses and Bland–Altman plots were computed to determine validity of accelerometers using GRF. There was a main effect of task with increasing acceleration values in tasks with increasing locomotion speed and landing height (P < 0.001). Data from ACT and GEN correlated with GRF (r = 0.90 and 0.89, respectively) and between each other (r = 0.98), but both accelerometers consistently overestimated GRF. The new generation of accelerometer models that allow raw signal detection are reasonably accurate to measure impact loading of bone in children, although they systematically overestimate GRF.  相似文献   

用密度梯度离心法富集源于小鼠胚胎干细胞的运动神经元样细胞前体     

StephanieRichardsonMilazi  BenjaminRixBrooks  Jean-LucMougeot 《河北北方学院学报(医学版)》2011,(1)

目的:我们的目标是从源于胚胎体(EBs)的小鼠胚胎干细胞(mESCs)中分离运动神经元样细胞前体(MNLCPs),以用于发展针对运动神经元疾病的药物筛选试验和移植疗法.天然Shh蛋白(或Shh通路激动剂)和维甲酸诱导的胚胎体中,MNLCPs和未分化细胞的含量是不确定的.如果不把未分化的细胞从细胞培养中充分去除,其可能会干涉药物筛选试验或在移植后增生.我们开发了一种以密度梯度离心法为基础的富集MNLCPs的方法.方法:我们用Wichterle等人2008年改进的方法,将mESCs( HBG3:eGFP:HB9)扩大和分化.通过化学和酶学的无研磨处理,含有绿色荧光蛋白的MNLCPs和未分化细胞的胚胎体被小心轻轻地离解成单细胞.利用OptiprepTM8％～20％逐步梯度离心技术将MNLCPs回收.拥有绿色荧光蛋白的MNLCPs的含量由流式细胞仪检测.结果:我们的结果表明,在胚胎体形成前,mESCs在明胶包被的培养板上生长,其分化为MNLCPs的能力减少.比较mESCs在明胶,明胶与PMEFs,及PMEFs包被的培养板上的生长发现,mESCs在PMEFs包被的培养板上产生含绿色荧光蛋白的MNLCPs的得率为(54.1±11.0)％(x-±s;n=12),在明胶包被的培养板上的得率为(2.8±1.1)％(x-±s;n=9).用密度梯度离心法获得的含绿色荧光蛋白的MNLCPs的平均含量为(87.7±5.5)％(x-±s;n=3).结论:我们的数据表明,不使用细胞分选器,无研磨解离和密度梯度离心法也能用于富集具有高存活率的MNLCPs.有必要对MNLCPs在体外、体内和表型上进行进一步的生理学意义(如神经轴突的生长及形成神经肌肉接头的能力)上的鉴定.  相似文献   

An efficient method of addressing ectopic beats: new insight into data preprocessing of heart rate variability analysis     

Wen F  He FT 《Journal of Zhejiang University. Science. B》2011,12(12):976-982

Heart rate variability (HRV) analysis is affected by ectopic beats. An efficient method was proposed to deal with the ectopic beats. The method was based on trend correlation of the heart timing signal. Predictor of R-R interval (RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal RRI. The type of ectopic beat was detected and replaced by the predictor of RRI. The performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density (PSD) estimation, whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free data. The result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical data. It indicated our method could improve the PSD estimation in HRV analysis. The method had advantages of high accuracy and real time properties to recover the sinus node modulation.  相似文献