The relationship between peak height velocity and physical performance in youth soccer players   总被引：1，自引：1，他引：0  

Philippaerts RM  Vaeyens R  Janssens M  Van Renterghem B  Matthys D  Craen R  Bourgois J  Vrijens J  Beunen G  Malina RM 《Journal of sports sciences》2006,24(3):221-230

Longitudinal changes in height, weight and physical performance were studied in 33 Flemish male youth soccer players from the Ghent Youth Soccer Project. The players' ages at the start of the study ranged from 10.4 to 13.7 years, with a mean age of 12.2 +/- 0.7 years. Longitudinal changes were studied over a 5 year period. Peak height velocity and peak weight velocity were determined using non-smoothed polynomials. The estimations of peak height velocity, peak weight velocity and age at peak height velocity were 9.7 +/- 1.5 cm x year-1, 8.4 +/- 3.0 kg x year-1 and 13.8 +/- 0.8 years, respectively. Peak weight velocity occurred, on average, at the same age as peak height velocity. Balance, speed of limb movement, trunk strength, upper-body muscular endurance, explosive strength, running speed and agility, cardiorespiratory endurance and anaerobic capacity showed peak development at peak height velocity. A plateau in the velocity curves was observed after peak height velocity for upper-body muscular endurance, explosive strength and running speed. Flexibility exhibited peak development during the tear after peak height velocity. Trainers and coaches should be aware of the individual characteristics of the adolescent growth spurt and the training load should also be individualized at this time.  相似文献   

Exploring thought experiments     

Palmerino  Carla Rita 《Metascience》2019,28(3):455-458

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Twitter and Television in a Hybrid Media System     

Rita Marchetti 《Journalism Practice》2016,10(5):626-644

By analyzing all of the keywords and hashtags that became Trending Topics (TTs) in the Italian Twittersphere during both an electoral period and a non-electoral period, we evaluated what Italian Twitter users discussed. We found that topics about actors and issues in the entertainment field (e.g., singers, Hollywood stars and television stars) drive Italian discussions and that the political sphere is a secondary topic that elicits minor arguments within users’ conversations. However, we believe that even this low level of discussion about politics was able to influence the public agenda, thanks to the advent of a hybrid media system in Italy. In fact, Italian print media and television constantly covered the individual tweets or hashtags of a niche of citizens who were discussing politics on Twitter. Television, a part of the Italian media system that is highly consumed by the public, is also a primary factor in determining the appearance of a specific actor or issue on the TT list. Furthermore, we empirically confirmed the logic of breaking news events on Twitter, a microblogging site that primarily focuses on exceptional occurrences.  相似文献   

Evaluating Measures of Optimism and Sport Confidence     

Gerard J. Fogarty  Harsha N. Perera  Andrea J. Furst  Patrick R. Thomas 《Measurement in physical education and exercise science》2016,20(2):81-92

The psychometric properties of the Life Orientation Test-Revised (LOT-R), the Sport Confidence Inventory (SCI), and the Carolina SCI (CSCI) were examined in a study involving 260 athletes. The study aimed to test the dimensional structure, convergent and divergent validity, and invariance over competition level of scores generated by these instruments. Exploratory structural equation modeling (ESEM) supported the measurement models for the SCI and CSCI but favoured a two-dimensional model for the LOT-R. ESEM analyses of the total pool of 33 items indicated satisfactory divergent validity among these optimism and sport confidence measures with the only overlap occurring between the LOT-R and CSCI measures of optimism. The SCI discriminated among athletes participating at different competitive levels and emerged as the most suitable instrument for measuring individual differences in sport confidence. The CSCI emerged as a better measure of optimism in a sporting context than the more general LOT-R.  相似文献   

Galileo through French Eyes     

Carla Rita Palmerino 《Metascience》2008,17(1):111-115

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In care and digitally savvy? Modern ICT use in long-term care institutions     

Alexander Seifert  Shelia R. Cotten 《Educational gerontology》2020,46(8):473-485

ABSTRACT

Although information and communication technologies (ICTs), such as smartphones, tablets, and the internet, have all become increasingly important in modern society, available studies on the adoption of ICTs have mostly focused on healthy and community-dwelling “young-old” adults. Relatively little is known about ICT use among long-term care residents, such as “old-old” adults, who often have various functional impairments and live in institutionalized settings. The study includes data on ICT use (TV, radio, computers, smartphones, tablets, and internet) among a large sample of 940 residents (mean age: 87.6 years) living in 20 retirement homes in Zurich, Switzerland. Twenty-one percent of residents reported using the internet, 13% used a smartphone, and 5% used a tablet. Younger older adults, those with more education, those with lower nursing-care levels, and those who reported being particularly interested in technology were more likely to own more than one ICT device. Compared with nonusers, internet users were more likely to be younger, better educated, and more interested in technology in general. Modern ICT usage has reached the long-term care sector and appears to play a significant role in many residents’ lives. Researchers should continue to examine the role of ICTs in the lives of older adults in general and for residents in long-term care in particular, given that this population is often ignored in studies of older adults and ICT use.  相似文献   

Economic development and functional literacy for women: A pilot project in Iran     

Rita Wiesinger 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1973,19(1):96-101

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Mass media,education and the transmission of values     

Rita Cruise O'Brien 《Prospects》1980,10(1):61-67

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INFLUENCES ON TEACHERS’ JUDGMENT ACCURACY OF READING ABILITIES ON SECOND AND THIRD GRADE STUDENTS: A MULTILEVEL ANALYSIS          下载免费PDF全文

Lisa Paleczek  Susanne Seifert  Barbara Gasteiger‐Klicpera 《Psychology in the schools》2017,54(3):228-245

The present study aims at examining variables (at individual and class level) that influence the accuracy of teacher judgments of second and third graders’ reading abilities (decoding and reading comprehension). Data of 1,468 students and 86 teachers were collected. Due to the nested structure of the data, multilevel regression analyses were applied. Results revealed about 5% of the variance in judgment accuracy at class level. Generally, teachers judged reading comprehension abilities more accurately than decoding abilities. Low‐achieving students’ abilities, though, were judged less accurately. Accuracy in judging decoding was higher in small classes and in students with special educational needs. Accuracy in judging reading comprehension grew along the years (higher in Grade 3 and at the end of the academic year). Additionally, teachers judged second language learners' reading comprehension less accurately. The results are discussed in the light of implications for teacher training.  相似文献   

Child and partner abuse: self-reported prevalence and attitudes in the north of Portugal     

Machado C  Gonçalves M  Matos M  Dias AR 《Child abuse & neglect》2007,31(6):657-670

OBJECTIVES: To determine the self-reported prevalence of child and partner physical and emotional abuse in the north of Portugal and to investigate attitudes about these forms of family violence. METHODS: Data were collected by questionnaire from a representative sample of parents in two-parent families with children under the age of 18 years. A total of 2,391 parents participated (1,057 males), aged 20-67 years. Four questionnaires were used, one behavioral and one attitudinal, for each of the forms of abuse: child and partner. RESULTS: At least one act of emotional or physical abuse towards a child during the previous year was reported by 25.9% of participants (12.3% reported physically abusive and 22.4% emotionally abusive acts). Abuse of a partner was reported by 26.2% of participants; at least one act of physical abuse during the previous year was reported by 12% and of emotional abuse by 23.7%. The attitudinal data, however, showed general disapproval of the use of violence, both for disciplining children and within marital relationships. The degree of self-reported support for physical punishment was higher in participants who reported using abusive behavior. Females more commonly reported acts of child abuse, and males reported acts of partner abuse. Both forms of self-reported abuse showed an association with low educational and socio-economic status. CONCLUSIONS: This is the first study in Portugal to analyze family violence through self-report using a representative sample. The findings indicate that child and partner abuse constitute a significant problem in the region of northern Portugal. The discrepancy between the self-reported behavioral and attitudinal data may reflect conflicts in Portuguese society, which is undergoing substantial cultural changes.  相似文献