急性力竭运动对大鼠血浆支链氨基酸及氨量变影响的研究     

钟兴明  姚鸿恩  韩慧婉 《首都体育学院学报》1999,(2)

本研究选用９ 只健康成年 Ｓ Ｄ 雄性大白鼠,采用一次性力竭游泳运动方式,通过运动前及运动后即刻从心脏取血, 测定其力竭运动前后血浆尿素氮、支链氨基酸、氨的量变情况。结果表明急性力竭性运动后大鼠血浆尿素氮、支链氨基酸、氨含量均呈明显增高, 且前两者的变化差异有显著意义（ Ｐ＜ ０． ０５）。结果提示急性力竭运动后体内蛋白质分解代谢、支链氨基酸的代谢增强,血浆氨、支链氨基酸的含量变化与运动性疲劳的出现和疲劳程度有密切关系。  相似文献   

体育教师工作倦怠现状的调查与分析     

华厚杰  孙利红 《湖北体育科技》2009,28(6):629-630,650

工作倦怠产生于长期的工作压力,表现为情绪、态度和行为的衰退状态,将直接导致出现情绪衰竭、人格解体和低成就感。体育教师不仅担负着体育教学的任务,还承担着基础教育改革和发展及素质教育的伟大历史重任。关注体育教师工作倦怠的现状、消极影响,产生的根源与措施研究具有深远意义。  相似文献   

Influence of sex and specialty on the prediction of middle-distance running performances using the Mercier et al.’s nomogram     

Jeremy B. Coquart  Daniel Mercier  Montassar Tabben  Laurent Bosquet 《Journal of sports sciences》2015,33(11):1124-1131

The aim was to test the influence of sex and specialty (3000, 5000 and 10000 m) on the validity of middle-distance running performance predictions obtained from the Mercier et al.’s nomogram. Consequently, we examined all official French track running rankings for the 3000-, 5000- and 10000-m events (men and women) from 2006 to 2012. A scoring table was used to determine the runners’ specialties. Only runners who performed in the three distance events within the same year were included (75 women and 400 men). The Mercier et al.’s nomogram was used to predict one running performance from the other two. The results showed no significant difference between actual and predicted running performances (P = 0.77). Female runners had significantly lower performances than male runners (P < 0.001). Specialty did not influence performances (P = 0.11). Very high correlations were found between actual and predicted performances (0.91 < r < 0.99), with the exception of women (r = 0.85) in 5000 m. Moreover, low limits of agreement were obtained for male and female runners, whatever the specialty. These results support the validity of the nomogram to predict running performance in the 3000-, 5000- and 10000-m events for male and female runners, whatever the specialty. The predicted running performances may be used in training programmes (e.g., to prescribe tempo runs) and competitions (e.g., to establish split times).  相似文献   

Intentional thought dynamics during exercise performed until volitional exhaustion     

Natàlia Balagué  Robert Hristovski  Sergi Garcia  Daniel Aragonés  Selen Razon  Gershon Tenenbaum 《Journal of sports sciences》2015,33(1):48-57

Using a non-linear approach, intentional dynamics of thoughts were examined during constant cycling performed until volitional exhaustion. Participants (n = 12) completed two sessions at 80% W_max. Their (1) intrinsic thought dynamics (i.e., no-imposed thoughts condition) and (2) intentional thought dynamics (i.e., imposed task-unrelated thoughts condition; TUT) were recorded and then classified into four categories: internal and external TUT (TUT-I, TUT-E) and external and internal task-related thoughts (TRT-E, TRT-I). The probability estimates for maintaining each thought category stable, the rate of switching from one category to another, and the entropy dynamics along the testing procedure were assessed and compared through time phase. Friedman ANOVA tests revealed a significant effect of effort increase on thought contents only in the imposed TUT test. While TUT-I probabilities decreased significantly (P < .001) as effort increased, TRT-I probabilities increased (P < .05). Moreover, the entropy to the entire thought dynamics increased at the outset of task performance and decreased upon approaching volitional exhaustion (P < .001). As time spent in constant effort increased, and volitional exhaustion approached, task relatedness (TUT, TRT), direction (internal, external), and entropy of thought contents changed unintentionally providing further evidence for a nonlinear dynamics of attention focus.  相似文献   

挑战性-阻碍性压力对工作满意度、情绪衰竭的差异性影响——上下属关系的调节作用     

李宗波  彭翠 《软科学》2014,(3):82-86

采用问卷调查法,以254名企业员工为对象,探讨了挑战性-阻碍性压力对员工情绪衰竭与工作满意度的差异性影响,以及上下属关系的调节作用。结果表明:挑战性压力与阻碍性压力对员工工作满意度分别具有显著的正向与负向影响;阻碍性压力对员工情绪衰竭具有显著正向影响,而挑战性压力的正向影响作用则不显著;上下属关系对挑战性压力与工作满意度、阻碍性压力与情绪衰竭之间关系均具有显著的调节作用,具体表现为强化了挑战性压力的积极作用,缓解了阻碍性压力的消极作用。  相似文献   

额外补充蛋白营养对小白鼠力竭运动的影响     

徐丹  李顺  唐立刚 《德州学院学报》2014,(6):59-62

目的:研究牛奶和鸡蛋对运动能力的影响,探讨牛奶和鸡蛋对运动疲劳恢复影响的可能机制.方法:将普通成体雄性ICR小白鼠(18只)随机均分对照组(CG)、额外补充牛奶组(MG),额外补充鸡蛋组(EG);采用10d递增负荷的游泳运动方式使小白鼠力竭.分析牛奶与鸡蛋对小白鼠力竭运动后血糖、血红蛋白(Hb)、血肌酐(CRE)含量影响及体重变化,记录力竭时间、观察行为状态.结果:与实验前比较,各组小鼠实验后血糖、血红蛋白(Hb)浓度下降,血肌酐(CRE)浓度上升;两实验组小鼠体重增加均显著高于CG组;两实验组与CG相比,运动时间显著延长.结论:小鼠运动疲劳后,机体出现各种疲劳指标的变化,额外补充牛奶和鸡蛋可以减少这些疲劳指标的改变.可能是通过增加糖储备来提高运动能力,保证机体在长时间运动时的能量来源;减缓运动过程中对蛋白质的过度利用;增加体内磷酸肌酸的贮备,提高磷酸肌酸的代谢能力等方面缓解运动疲劳的,尚待进一步研究.  相似文献   

高校辅导员情绪劳动策略与个体幸福感关系实证研究简     

刘妍君  王丹平 《高校辅导员学刊》2014,(1):22-26

高校辅导员情绪劳动策略与个体幸福感存在显著偏相关。表层扮演与情绪衰竭有显著的正相关,与工作满意度有显著的负相关;深层扮演与情绪衰竭有显著的负相关,与工作满意度有显著的正相关。此外对研究结果在高校辅导员的招聘、培训及待遇上的应用进行了分析。  相似文献   

牛磺酸和耐力训练对力竭运动大鼠脑组织的保护作用   总被引：6，自引：2，他引：4  

李良鸣  罗智  魏源  罗桂珍 《西安体育学院学报》2003,20(1):54-56,76

采用游泳训练或在饮水中补充牛磺酸 (浓度为 1% )的方法 ,观察牛磺酸或耐力训练对大鼠跑台运动至力竭时脑组织自由基代谢的影响。结果表明 :补充牛磺酸或耐力训练能延长大鼠运动至力竭的时间 (P >0 0 5 ) ;力竭运动使大鼠脑组织MDA显著增加 (P <0 0 5 ) ,SOD活性和GSH含量显著下降 (P <0 0 1) ;补充牛磺酸或四周的耐力训练都可以显著降低力竭运动大鼠脑组织脂质过氧化水平 ,显著提高其SOD活性和GSH含量 (P <0 0 1) ;耐力训练的同时补充牛磺酸不仅可以改善脑组织自由基代谢的有关指标 (P <0 0 5 ) ,而且显著延长大鼠运动至力竭的时间 (P <0 0 5 )。本研究提示 ,牛磺酸和耐力训练对力竭运动大鼠脑组织具有保护作用。  相似文献   

急性力竭运动对中枢神经系统细胞凋亡的影响     

陆阿明  陆爱云  夏春林 《体育与科学》2007,28(2):62-65,59

为了探讨运动对中枢神经系统细胞功能的影响,对SD大鼠急性力竭运动后中枢神经系统细胞凋亡的数量进行了检测,结果发现急性力竭运动后中枢神经系统细胞凋亡数量显著增加,力竭运动强度增加凋亡细胞数量增加,且均为神经胶质细胞。表明急性力竭运动可能对中枢神经系统细胞功能有不良影响。  相似文献   

唐山地区图书馆员工作倦怠及其影响因素研究     

杨双琪  刘晨光 《晋图学刊》2010,(3):12-14

采用问卷调查的方法对唐山地区的236名图书馆员的工作倦怠现况进行实证研究,分析相关人口统计学因素对馆员工作倦怠的影响。研究结果显示,唐山地区高校和公共图书馆员工作倦怠整体程度不高;年龄、学历、馆型和工作部门等因素对图书馆员的工作倦怠水平有一定影响。  相似文献