铬与运动机体糖原代谢     

高元元  胡效芳 《安徽体育科技》2005,26(1):42-44

铬是胰岛素发挥生物学作用所必需的微量元素，缺铬可引起胰岛素抵抗，而铬补剂可改善胰岛素抵抗，增加胰岛素靶组织对胰岛素的敏感性，影响机体对葡萄糖的摄取、氧化和糖原合成。就铬对运动机体葡萄糖代谢的影响作一综述。  相似文献   

壳聚糖对运动训练大鼠骨骼肌和肝脏线粒体自由基代谢的影响   总被引：6，自引：0，他引：6  

熊静宇  文质君  李红  陈筱春 《体育学刊》2003,10(6):53-54

了解壳聚糖对大鼠耐力运动中自由基代谢的影响。大鼠进行4周跑台耐力训练,以0.5g kg壳聚糖灌胃,测定骨骼肌和肝脏线粒体中丙二醛(MDA)和活性氧的含量。结果表明:服药组与运动组比较骨骼肌和肝脏线粒体中MDA含量显著降低(P<0.05);服药组骨骼肌活性氧含量显著低于运动组(P<0.05);肝脏活性氧没有明显的变化。壳聚糖能有效地减轻运动所产生的内源性自由基对大鼠的伤害,增强大鼠运动能力,延缓疲劳的发生。  相似文献   

运动对Leptin的影响及Leptin调节代谢的某些相关因素   总被引：1，自引：0，他引：1  

王丽丽  陆一帆  张晓宁 《北京体育大学学报》2001,24(1):58-61

消脂素 (L eptin,L P)在体重调节方面的作用是肯定的 ,而不同运动对其影响不同。随着分子生物学技术的发展 ,有关 L P的生物学特性已获得大量资料 ,且证实血 L P调节代谢同多种因素相关 ,运动作为刺激手段通过不同途径影响 L P。  相似文献   

对体育灰色关联度分析的某些商榷   总被引：2，自引：0，他引：2  

柳方祥 《体育科学》1993,(1)

本文在分析文献[1]、[2]的基础上发现了构成女子七项全能总成绩的各单项成绩对全能总成绩的灰色关联度与序列始点有关,与序列长度有关,与数据的信息容量及信息的新陈伐谢有关,并非唯一。任意时间区段的关联度并不具备训练决策的参考意义。  相似文献   

不同速度运动后大鼠骨骼肌氧化还原状态的变化及乳酸阈的形成   总被引：2，自引：0，他引：2  

冯连世  宗丕芳 《体育科学》1993,13(2):60-63,69

本研究的目的在于观察不同速度运动后大鼠骨骼肌氧化还原状态的变化及其与乳酸阈形成之间的关系。通过测定不同速度运动后 SD 大鼠骨骼机 NADH 和 NAD 含量变化发现,低强度运动后 NADH下降,中等强度运动后又升高,肌乳酸均有少量增加。在乳酸阈速度时,NADH 含量和 NADH/NAD 比值呈现出迅速增加的趋势。由此得出结论:中等强度运动后 NADH 含量升高主要是线粒体内 NADH 发生改变;肌肉 NADH/NAD 比值的变化对乳酸阈的形成是极其重要的调节因素。在中强度时细胞即开始向还原状态转变,可能对加速乳酸的积累和乳酸阈的形成具重要意义。  相似文献   

针灸足三里穴对运动小鼠体内自由基代谢的影响   总被引：14，自引：0，他引：14  

朱梅菊  高顺生  李红  熊静宇 《天津体育学院学报》2001,16(2):16-18

为探讨针灸足三里穴对小鼠运动能力和自由基代谢的影响，采用小鼠游泳训练模型、观察体重等一般健康状况、游泳耐力，血浆、肝脏及肌肉组织中SOD、GSH-Px活力和MDA含量。结果表明，针灸足三里穴能改善训练小鼠整体健康状况，提高小鼠游泳耐力和血浆、肝脏、肌肉中SOD、GSH-Px活力，降低MDA含量。提示针灸足三里穴能提高小鼠运动能力，其机理与纠正运动小鼠自由基代谢失衡有关，为运动性疲劳的防治提供了有效的方法。  相似文献   

竞走运动员“阈值速度”的研究   总被引：3，自引：0，他引：3  

窦文浩  翟士岭 《体育科学》1993,13(2):55-59

为不断提高竞走运动员的训练水平,通过对运动员血液中乳酸含量的分析,求出其运动强度达乳酸阈时的速度(即“阈值速度”),对提高竞走运动员有氧代谢能力的训练有重要意义。研究发现运动员血乳酸浓度总体位置达3mmol/L 左右时,出现非线性临界点。达临界点时的“阈值速度”与运动成绩、比赛速度呈高度相关;临界点时的平均心率为162次/分。本文采用坐标作图方法求得乳酸阈值及“阈值速度”。  相似文献   

Inhibition of preadipocyte differentiation by Lycium barbarum polysaccharide treatment in 3T3-L1 cultures     

《Electronic Journal of Biotechnology》2021

BackgroundLycium barbarum (also called wolfberry), a famous Chinese traditional medicine and food ingredient, is well recognized for its significant role in preventing obesity; however, the molecular mechanisms underlying its preventive effects on fat accumulation are not well understood yet. The aim of this study was to determine the effects and mechanism of Lycium barbarum polysaccharides (LBP) on the proliferation and differentiation of 3T3-L1 preadipocytes. MTT was used to detect the proliferation of 3T3-Ll preadipocytes. Oil red O staining and colorimetric analysis were used to detect cytosolic lipid accumulation during 3T3-L1 preadipocyte differentiation. Real-time fluorescent quantitative PCR (qPCR) technology was used to detect peroxisome proliferator-activated receptor γ (PPARγ), CCAAT/enhancer-binding protein α (C/EBPα), adipocyte fatty-acid-binding protein (aP2), fatty acid synthase (FAS), and lipoprotein lipase (LPL) expression.ResultsThe concentration of LBP from 25 to 200 μg/mL showed a tendency to inhibit the growth of preadipocytes at 24 h, and it inhibited the differentiation of 3T3-L1 preadipocytes in a dose-dependent manner. In the preadipocytes treated with 200 μg/mL LBP, there were reduced lipid droplets in the cytoplasm, and its effect was opposite to that of rosiglitazone (ROS), which significantly reduced the PPARγ, C/EBPα, aP2, FAS, and LPL mRNA expression of adipocytes.ConclusionsLBP exerts inhibitive effects on the proliferation and differentiation of 3T3-L1 preadipocytes and decreases the cytoplasm accumulation of lipid droplets during induced differentiation of preadipocytes toward mature cells. Above phenomenon might link to lowered expression of PPARγ, C/EBPα, aP2, FAS, and LPL after LBP treatment. Thus, LBP could serve as a potential plant extract to treat human obesity or improve farm animal carcass quality via adjusting lipid metabolism.How to cite: Xu X, Chen W, Yu S, et al. Inhibition of preadipocyte differentiation by Lycium barbarum polysaccharide treatment in 3T3-L1 cultures. Electron J Biotechnol 2021;50. https://doi.org/10.1016/j.ejbt.2021.01.003  相似文献   

论福斯特的生态马克思主义思想及其当代价值     

李佳润  陈子慧 《大众科技》2016,(5):155-157

约翰·贝拉米·福斯特认为马克思的唯物论理论蕴含着深入人心的生态观,他指出全世界经济和社会秩序在实际与理论之间呈现出的致命性冲突越来越明显,特别是生态环境方面的矛盾,地球正面临着日益严重的生态崩溃威胁。他提出的只有马克思主义理论才能在真正意义上克服生态危机的思想被世界所瞩目,福斯特在对新自由主义、新保守主义以及资本主义进行抨击的同时,提出社会主义复兴的伟大趋势并指出对此充满信心。他的生态学马克思主义思想不光是对马克思主义生态学理论进行了重新构建,并且对我国社会主义和谐社会的发展具有重要的战略性意义和重大研究价值。  相似文献   

Effect of iron deficiency on developing rat brain     

Jyoti Batra  P. K. Seth 《Indian journal of clinical biochemistry : IJCB》2002,17(2):108-114

Iron deficiency evolves, slowly through several stages. Early iron deficiency caused a depletion in iron stores as shown by a reduction in the levels of hepatic non heme iron (44%) in the 7 days old pups born to iron deficient mothers. The hemoglobin levels and PCV (packed cell volume) were significantly reduced only after the age of three weeks. The activities of GABA (γ-amino butyric acid) shunt enzymes viz. GDH, GAD and GABA-T (glutamate dehydrogenase, glutamate decarboxylase and GABA-transaminase, respectively) and GABA content were found to decrease during gestation and/or lactation iron deficiency at 1 week (wk), 2wk, 3wk and 4wk of age in the developing rat brains. However GABA binding showed a significant increase at different age groups. The iron deficiency during lactational exposure showed significant alteration in most of the parameters only at the age of 3 weeks onwards. On rehabilitation with iron supplemented diet for 2 weeks, these altered parameters could not attain corresponding control values. A prolonged iron deficiency causing alterations in GABA may lead to neurological and behavioral alterations.  相似文献