Children’s metabolic expenditure during object projection skill performance: New insight for activity intensity relativity     

Ryan S. Sacko  Danielle Nesbitt  Kerry McIver  Ali Brian  Farid Bardid  David F. Stodden 《Journal of sports sciences》2019,37(15):1755-1761

Objective: To examine children’s energy expenditure (EE) during object projection skill performance at three intensity intervals. Methods: Children’s (42, Mage = 8.1) average metabolic equivalents of task (METs) were calculated using a COSMED K4b2 while they repeatedly performed blocks of kicking, throwing (overhand), and striking (two-handed) during 6, 12, and 30-s interval conditions. A repeated-measures analysis of covariance examined differences in METs while controlling for skill level. Results: Data indicated a main effect for interval condition (df = 2, 123, F = 94.36, p <.001, η2 = .605). Post hoc t-tests demonstrated decreasing performance interval times yielded progressively higher METs (p <.001) across the three conditions (30s = 4.5±0.8 METs, 12s = 6.3±1.3, 6s = 8.3±1.6). There also was a main effect for sex (df = 1,120, F = 52.28, p <.001 η2 = .305). Boys demonstrated higher METs at each performance interval (p <.001). Conclusion: Skill practice with a maximum of one trial every 30s resulted in the equivalent of at least moderate physical activity (>4.0 METs) and intervals of 6s demonstrated vigorous physical activity (>7.0 METs). Practicing/performing object projection skills, even at intervals that allow for adequate instruction and feedback (i.e., 1 trial/30s), promotes MVPA in children.  相似文献   

Toward a Pan-cultural Typology of Deception Motives     

Timothy R. Levine  Mohamed Vaqas Ali  Marleah Dean  Rasha A. Abdulla  Karina Garcia-Ruano 《Journal of Intercultural Communication Research》2016,45(1):1-12

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真空预压技术对软粘土物理与力学属性影响的试验研究   总被引：3，自引：0，他引：3  

刘汉龙  赵仲辉  高玉峰  张秀勇 《东南大学学报》2005,21(1):82-87

研制了一套新三轴试验仪,该仪器能将堆载和真空加载在土样上,在固结进行中能同时监控超孔隙水压力、轴向应变(沉降)与体积应变.并根据浙江省温州市原状软粘土进行了固结试验,软粘土的天然含水率是72.5%.试验结果发现,真空预压、堆载预压或真空堆载联合预压3类加固方式中,粘土的固结特性没有明显差异.研究表明3种加固方法改变了软土的一些物理属性并改善了它的力学属性.  相似文献   

中国足协处罚权研究          下载免费PDF全文

邓小兵  王阿丽 《河北体育学院学报》2021,35(6):36-43

中国足协的处罚权是其参与体育治理的重要手段,相较于法定性强、形态有限的行政处罚, 更具专业性和针对性。为了保障其良性运转,维护相对人的诉讼权利,司法权的适度介入已成为理论界的共识。但我国传统的行政主体理论不能回应这种社会公权力发展的现实需要,并对其作出合理解释。因此,亟需重构我国的行政主体理论,赋予中国足协行政主体地位,构建司法审查规则,即法院审查足协处罚权时应当遵循仲裁优先原则、穷尽内部救济原则、法律审查原则;在审查范围上,除了审查足协处罚行为,还应当附带审查处罚规则。  相似文献   

Combining management training and technical training in an international setting     

William Fisher  Ali Kamel Ali 《Performance Improvement》1992,31(9):27-31

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Interactive cube for effective demonstration of virtual periodic table     

Ali  Numan  Ullah  Sehat  Raees  Muhammad 《Education and Information Technologies》2022,27(2):1635-1654

Education and Information Technologies - Virtual Periodic Table (VPT) is an effective software tool to present elements in a conceivable three-dimensional (3D) mode. VPT is used to assist users in...  相似文献