Neuromuscular,metabolic and hormonal profiles of young tennis players and untrained boys     

Antti Mero  Laura Jaakkola  Paavo V. Komi 《Journal of sports sciences》2013,31(2):95-100

This study compared the neuromuscular, metabolic and hormonal profiles of trained prepubescent tennis players and an untrained group. The boys in the experimental group (n = 9; mean age ± S.D. = 11.4 ± 0.5 years) had participated in tennis training for 2.3 ± 1.0 years and the boys in the control group (n = 9; mean age ± S.D. = 10.9 ± 0.4 years) were normal active volunteers. The tennis players were found to be physically more active than the controls when the comparison was made for either 1 year (4.9 ± 1.8 vs 2.6 ± 2.5 times per week; P<0.05) or for 1 week (3.4 + 1.2 vs 0.4 ± 0.5 times; P < 0.001) preceding the tests. Choice reaction time was significantly (P <0.01) shorter in the experimental group (258 ± 16 ms) than in the control group (344 + 81 ms). Dropping height in the best drop jump was significantly (P< 0.05) higher in the tennis players (0.46 + 0.19 m) than in the control boys (0.27 ± 0.10 m). The tennis players had significantly lower oxygen consumption at the ‘anaerobic threshold’ than the controls (P < 0.05). There were no significant differences between the groups in serum hormone levels. The small differences that existed may have been caused by actice participation in sport by the tennis players.  相似文献   

Gold Medal Volleyball: The Training Program and Physiological Profile of the 1984 Olympic Champions     

Carl M. McGown  Robert K. Conlee  Anthony A. Sucec  Michael J. Buono    William Phillips 《Research quarterly for exercise and sport》2013,84(2):196-200

Abstract

This study focused on the differences between experienced and inexperienced physical education teachers' approaches to planning, low inference indicators of teaching behavior during instruction, and global variables from the Beginning Teacher Evaluation Study. It was found experienced teachers asked many more questions before they began planning than did inexperienced teachers. Experienced teachers' plans reflected a concern about contingencies that might arise during instruction, whereas inexperienced teachers' plans did not. Interaction analysis and codings of student engagement showed marked differences between experienced and inexperienced teachers. Judging the qualities of experienced and inexperienced teachers also showed important differences. These sources of data are interrelated and give a vivid picture of how experienced and inexperienced teachers differ in accomplishment of instruction. The findings are discussed in terms of what they may mean for teacher development programs.  相似文献   

Personal ontologies: Generation of user profiles based on the YAGO ontology     

Silvia Calegari  Gabriella Pasi 《Information processing & management》2013

Personalized search is aimed at tailoring the search outcome to users; to this aim user profiles play an important role: the more faithfully a user profile represents the user interests and preferences, the higher is the probability to improve the search process.  相似文献   

Correlation of Cord Blood Lipid Heterogeneity in Neonates with Their Anthropometry at Birth     

Chandrika D. Nayak  Vaibhav Agarwal  Dinesh M. Nayak 《Indian journal of clinical biochemistry : IJCB》2013,28(2):152-157

Objective: Fetus with intrauterine stress may exhibit programmed changes that can alter its metabolism and bear severe risk for diseases in adult life. The current study was designed to assess the correlation between cord blood lipid profile with the anthropometric data in neonates. Materials and methods: 146 newborn babies born at Dr. T M A Pai Hospital, Udupi were screened and their birth weight, length, head circumference and abdominal circumference were noted at birth. Umbilical cord blood samples were analyzed for total cholesterol, triglycerides (TG), high density lipoprotein (HDL) and low density lipoprotein (LDL). Infants were also grouped further based on gestational age (GA) and sex-adjusted birth weight percentiles into three groups i.e. Small for gestational age (SGA), Appropriate for gestational age (AGA) and Large for gestational age (LGA) for comparison of their lipid profiles. Inclusion criteria were normal fetal heart rate at birth and an APGAR score >7. Statistical significance of relation between lipid profile and anthropometry was done using ANOVA and Pearson correlation coefficient. Results: Triglycerides were significantly higher in babies with higher ponderal index (PI) than those with lower PI (P = 0.011). The TG level of SGA babies were significantly higher as compared to AGA group (P = 0.001). The LDL levels in neonates with higher abdominal circumference were significantly lower than those with lower AC (P = 0.019). Mean HDL levels were higher in neonates with larger AC, but not statistically significant. Maternal BMI had no influence on neonates’ lipid profile. Conclusion: Abnormal intrauterine milieu created by maternal changes during gestation may bear a profound impact on lipid metabolism in neonates, which may account for their differences in lipid profile and anthropometry at birth.  相似文献   

Taylor中值定理的一个几何注释     

费罗曼  胡誉满 《江西电力职业技术学院学报》2007,20(4):37-38

讨论当n>0(n为整数)时,Taylor中值定理的一个几何注释。  相似文献   

Ant colony system algorithm for the optimization of beer fermentation control     

肖杰  周泽魁  张光新 《浙江大学学报(A卷英文版)》2004,5(12):1597-1603

Beer fermentation is a dynamic process that must be guided along a temperature profile to obtain the desired results. Ant colony system algorithm was applied to optimize the kinetic model of this process. During a fixed period of fermentation time, a series of different temperature profiles of the mixture were constructed. An optimal one was chosen at last. Optimal temperature profile maximized the final ethanol production and minimized the byproducts concentration and spoilage risk. The satisfactory results obtained did not require much computation effort.  相似文献   

The predictive role of early childhood dysregulation profile on the parallel growth trajectories of reading and math performance across elementary and middle school     

《Contemporary educational psychology》2023

This study examined the heterogeneity in the co-developmental trajectories of reading and math performance (i.e., parallel changes in the initial scores and growth patterns) and identified the number, size and shape of the co-developmental trajectory across elementary and middle schools. In addition, this investigation focused on how an early childhood dysregulation profile (DP; indexed by a high co-occurrence of emotional, behavior, and attention problems) was associated with distinct co-developmental trajectories of reading and math performance. Specifically, we examined whether early childhood DP level can predict (a) membership assignment into each distinct co-development group and (b) variability in initial scores and changes in growth with each distinct co-development group. Participants were 784 academically at-risk students (47 % girls) predominantly from low socioeconomic status families who were recruited in first grade (Mean age = 6.57 years) and followed annually through the final year of middle school (ninth grade). Results revealed two distinct co-developmental trajectories of reading and math performance, including (a) a lower initial reading (higher increasing) and higher initial math (lower increasing) class (85.3 %) and (b) a lower initial math (higher increasing) and higher initial reading (lower increasing) class (14.7 %). Our results provided evidence for the compensatory pattern of co-developmental trajectories, indicating initial lower skills grow at a faster rate than the initial high. Further, early childhood DP was not associated with the membership assignment for these two distinct classes, which means that regardless of children’s early DP level, they have equal chances to be assigned to each of the classes. However, children with higher parent and teacher-reported DP in first grade demonstrated lower initial scores and a slower improvement rate in both classes after controlling for kindergarten literacy skills, gender, ethnicity, intelligence, socioeconomic status, and grade retention. Our study findings demonstrated (a) substantial heterogeneity in the co-developmental trajectories of reading and math performance across elementary and middle school ages; and (b) the importance of promoting self-regulation beginning in early childhood, especially for academically at-risk children in families facing economic challenges.  相似文献   

A UML profile for framework modeling     

徐小良  汪乐宇  周泓 《Journal of Zhejiang University. Science. B》2004,(1)

INTRODUCTIONObject oriented (OO )frameworksbecamemoreandmorepopularinthesoftwareindustryduringthe1990s.Aframeworkisasetofcooper atingclassesthatmakeupareusabledesignforaspecificclassofsoftware (Deutsch ,1989;John sonandFoote,1988) .Applicationsbuiltontopofsuchaframeworkreusenotonlyitssourcecodebutalsomoreimportantitsarchitecturedesign(Pree,1994;1995;FayadandSchmidt,1997;MarkiewiczandLucena ,2 0 0 1) .Consequently,theuseofframeworksreducesthecostsandim provesthesoftwarequalitygreatly .…  相似文献   

Iterative method on well bore boundary in numerical modeling of variably saturated flow     

王俊  黄岁樑 《天津大学学报(英文版)》2012,18(2):104-111

An iterative method was developed for incorporating the well bore boundary into the finite difference model of water flow in variably saturated porous media. Six cases were presented involving groundwater pumping or injection to demonstrate the advantages of the iterative method over the traditional method. For the iterative method, the total flux gradually approached the well discharge and the flux profile was non-uniform. And the iterative method took into account the variation of well bore water table. Compared to the traditional method, the iterative method can simulate the variably saturated flow caused by pumping or injection more realistically.  相似文献   

重力坝结构优化的设计     

张春娟 《杨凌职业技术学院学报》2012,11(1):1-3

混凝土重力坝的实用剖面优化设计是根据安全、经济和强度要求。通过分析计算,选择一个既使体积最小·又使施工方便的剖面形态和轮廓尺寸。本文建立了混凝土重力坝结构优化设计的数学模型和优化设计的VB软件,并应用该软件对工程实例进行了优化设计,结果证明该优化设计方法及软件具有较好的工程实用性。  相似文献