儿童焦虑与父母教养方式关系的调节变量研究          下载免费PDF全文

周晶 《宁波大学学报(教育科学版)》2021,(1):127-132

研究综合了来自中国大陆18570名3-12岁儿童的焦虑与父母教养方式相关的30项研究的数据,通过元分析的方法考查了二者相关的强度,并分析影响相关强度的因素。从总体上来说,儿童焦虑与父母教养方式存在弱相关;父母教养方式类型、儿童年龄、父母性别会对二者关系产生调节作用。建议在教养儿童过程中要采用正向的教养方式,要给予年幼儿童充分的独立自主的权利和自由,鼓励父亲参与教养,这有利于降低儿童的焦虑水平。  相似文献   

架设三二连续“中高职贯通”立交桥——关于“三二连读”人才培养工作的几点思考     

覃川 《青岛职业技术学院学报》2013,(1):24-26

实施中高职＂三二连读＂体制改革模式的目的是培养社会需要的合格人才。要明确合作定位：以构建职教集团来实践、探索一种新的中高职衔接的模式;要明确目标定位：力求特色发展、品牌打造,合作共赢。高职教育面临着＂学教做合一＂教育观的确立、高职教育课程改革推进、教学管理与学生服务一体化的实施等一系列亟待解决的问题,而以＂三二连读＂为载体的中高职衔接新模式将可以为高职教育发展拓展新的空间,而坚持高职教育高素质高技能的应用型人才培养定位,可以为社会培育合格的＂全人＂。这些都是高职教育的生命力所在。  相似文献   

补充扇贝肽对运动大鼠停训后萎缩骨骼肌细胞Caspase-3活性的影响   总被引：1，自引：0，他引：1  

潘小玲  郭振新  庞阳康 《山东体育学院学报》2011,27(7):53-57

目的:通过测试萎缩骨骼肌细胞Caspase-3、SOD活性和MDA含量,观察补充扇贝肽对运动大鼠停训导致骨骼肌萎缩后肌细胞Caspase-3活性及其抗氧化能力的影响,研究扇贝肽对停训后骨骼肌萎缩的干预作用。方法:40只SD雄性大鼠以15 m/min的速度,持续性水平跑台训练30 min开始进行递增负荷运动,运动6 d/周,休息1 d/周,速度递增3 m/min/周,时间递增30 min/周,运动3周后即刻处死10只大鼠为基础对照组,其余大鼠随机分组为补充安慰剂阴性对照组、补充牛乳阳性对照组和补充扇贝肽实验组,30只大鼠左侧后肢实施石膏固定模拟停训模型,并进行扇贝肽补充实验。实验组和对照组所有动物每天分别进行灌胃15%扇贝肽饮料2mL、等量的安慰剂和牛乳。结果:发现补充扇贝肽可显著减低停训后萎缩骨骼肌细胞MDA含量增加,增加SOD活性,提高细胞内抗氧化能力,可显著抑制停训后萎缩骨骼肌细胞Caspase-3的活性,从而抑制骨骼肌收缩蛋白和结构蛋白的降解,促进萎缩骨骼肌的恢复。  相似文献   

Image-based modeling approach in creating 3D morphogenetic reconstruction of Liberty Square in Novi Sad     

Vesna Stojakovic  Bojan Tepavcevic 《Journal of Cultural Heritage》2011,12(1):105-110

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Between-limb differences in running technique induces asymmetric negative joint work during running     

Satoru Hashizume  Hiroaki Hobara  Yoshiyuki Kobayashi 《European Journal of Sport Science》2019,19(6):757-764

Negative work, which is mainly generated by eccentric muscle contraction, has an important influence on the associated muscle damage. Generally, mechanical parameters are determined for one side of a lower extremity on the assumption of negligible between-limb differences. However, between-limb differences in the negative work of lower extremity joints during running remain unclear. This study examines between-limb differences in negative work and associated mechanical parameters during the contact phase of running. Twenty-five young adult males voluntarily participated in this study. Each participant was asked to run on a straight runway at a speed of 3.0?m?s^?1. Negative work, amplitude, duration of negative power, moment, and angular velocity were computed for both sides of the lower extremities. Significant differences were found in negative work between limbs for the hip (18.9?±?11.7%), knee (13.6?±?10.4%), and ankle (11.8?±?8.5%) joints. For the hip joint, asymmetric negative work was attributable to the between-limb difference in the amplitude of negative power owing to a corresponding difference in the moment. The between-limb differences concerning the duration and amplitude of negative power could explain the asymmetric negative work in the knee joint. The asymmetric negative work of the ankle joint was attributable to the between-limb difference in the amplitude and duration of the negative power and the moment. These results indicate that asymmetric negative work was generated in each lower extremity joint; however, the major mechanical parameters corresponding to the negative work are not the same across the joints.  相似文献   

一种机载重轨InSAR高精度三维定位方法     

董小桐  韩春明  岳昔娟  赵迎辉 《中国科学院大学学报》2019,36(6):844-850

在重轨干涉实际测量中,两次飞行航迹难以保持高度重合,飞行高度和姿态不稳定,干涉图像对存在明显不规则的相对形变,难以进行三维定位。通过分析重轨机载InSAR图像对的几何形变和形成原因,提出一种从精准的InSAR成像几何关系出发,通过修正成像参数,实现机载重轨InSAR高精度三维定位的方法。该方法通过引入地面控制点,实现干涉图像对精准的相对定位,生成高精度DEM;并利用高精度DEM,实现机载重轨InSAR高精度三维定位。对比检查点实测结果和定位结果,表明该方法可有效地解决机载重轨InSAR的三维定位困难的问题。  相似文献   

基于ActiGraph GT3X监测网球运动能量消耗的研究          下载免费PDF全文

袁川 《河北体育学院学报》2017,31(4):83-91

目的:应用ActiGraph GT3X对网球运动等非周期性运动能量消耗进行测评,建立适合网球运动能耗预测的回归方程,从而丰富ActiGraph测量体系.方法:以K4b2测量值作为校标,分别在拍柄、持拍手手腕外侧、腰部髂肌外侧、大腿中央前侧和脚踝外侧(持拍手同一侧肢体)各佩戴一个加速度计(ActiGraph GT3X),同步对网球运动中不同球速下(30 km/h、60 km/h)的原地正、反手击球,侧向移动正、反手击球,向前移动正、反手击球,侧向移动正反手交替击球和模拟自由单打的运动过程进行监测.结果:腰部、大腿和踝关节部位GT3X的EE和MET预测值存在明显低估,与K4b2测量值一致性较低;手腕和拍柄部位GT3X的EE和MET预测值存在明显高估,与K4b2测量值一致性较低;研究建立了2个网球运动能耗预测回归方程,经检验其预测值与实测值没有显著性差异.结论:运用ActiGraph GT3X对网球等隔网对抗运动项目进行监测存在显著误差,EE和MET的预测存在明显高估或低估的现象;基于ActiGraph GT3X所建立的能耗预测方程能对网球运动进行有效的运动监测.  相似文献   

Kinematic analysis of the drag flick in field hockey     

Rony Ibrahim  Gert S. Faber  Jaap H. van Dieën 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(1):45-57

Attaining high speed of the stick head and consequently of the ball is essential for successful performance of the drag flick in field hockey, but the coordination pattern used to maximise stick head speed is unknown. The kinematics of the drag flick was studied in ten elite hockey players who performed twenty shots each towards a target located 1.5 m high. A 150 Hz active marker motion analysis system was used, alongside two force plates to detect foot touchdown. Angular velocity and contribution to stick endpoint speed of upper body joints were analysed. Repeated measures ANOVA was used to compare timing of onset and peak angular velocities between joints. Participants used a kinematic pattern that was close to a proximal-to-distal sequence. Trunk axial rotation and lateral rotation towards the target, right wrist flexion and left wrist extension were the main contributors to stick endpoint speed. Coaches should emphasise trunk rotations and wrist flexion and extension movements for maximising stick head speed. Given the high level of the participants in this study, the coordination of joints motions, as reported here, can serve as a guideline for drag flick training.  相似文献   

Shoe drop reduction influences the lower limb biomechanics of children tennis players during an open stance forehand: A longitudinal study     

Alexis Herbaut  Emilie Simoneau-Buessinger  Franck Barbier  Christophe Gillet  Maxime Roux  Nils Guéguen 《European Journal of Sport Science》2017,17(10):1261-1269

Compared to traditional tennis shoes, using 0-drop shoes was shown to induce an immediate switch from rear- to forefoot strike pattern to perform an open stance tennis forehand for 30% of children tennis players. The purpose of the study was to examine the long-term effects of a gradual reduction in the shoe drop on the biomechanics of children tennis players performing open stance forehands. Thirty children tennis players participated in 2 laboratory biomechanical test sessions (intermediate: +4 months and final: +8 months) after an inclusion visit where they were randomly assigned to control (CON) or experimental (EXP) group. CON received 12-mm-drop shoes twice, whereas EXP received 8?mm then 4-mm-drop shoes. Strike index indicated that all CON were rearfoot strikers in intermediate and final test sessions. All EXP were rearfoot strikers in intermediate test session, but half the group switched towards a forefoot strike pattern in final test session. This switch resulted in a decreased loading rate of the ground reaction force (?73%, p?=?.005) but increased peak ankle plantarflexors moment (+47%, p?=?.050) and peak ankle power absorption (+107%, p?=?.005) for these participants compared with CON. Biomechanical changes associated with the long-term use of partial minimalist shoes suggest a reduction in heel compressive forces but an increase in Achilles tendon tensile forces.  相似文献   

Rg3对游泳运动员有氧能力相关指标的影响          下载免费PDF全文

石巍  赵德峰  赵海燕  叶晶龙  钱风雷  王晨 《体育科研》2014,(4):55-57

教探讨补充Rg3对游泳运动员有氧能力相关指标的影响。实验对象为上海游泳队的12名游泳运动员。每人日服用4粒Rg3胶囊。持续3周服用Rg3后,血乳酸水平显著下降(P<0.05或P<0.01)。安静状态的平均红细胞体积(MCV)和红细胞分布宽度(RDW-SD)明显降低(P<0.05);安静状态平均血红蛋白浓度(MCHC)显著升高(P<0.05)。结果表明,服用人参皂苷Rg3可以提高游泳运动员的有氧能力。  相似文献