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排序方式： 共有323条查询结果，搜索用时 15 毫秒
261.
Duncan S. Buchan Gareth Knox Anwen M Jones Grant R Tomkinson Julien S. Baker 《Journal of sports sciences》2019,37(5):507-514
The purpose of this study was to examine the ability of international normative centiles for the 20 m shuttle run test (20mSRT) to identify youth at increased cardiometabolic risk. This was a cross-sectional study involving 961 children aged 10–17 years (53% girls) from the United Kingdom. Receiver operating characteristic (ROC) curves determined the discriminatory ability of cardiorespiratory fitness percentiles for predicting increased cardiometabolic risk. ROC analysis demonstrated a significant but poor discriminatory accuracy of cardiorespiratory fitness in identifying low/high cardiometabolic risk in girls (AUC = 0.58, 95% CI: 0.54–0.63; p = 0.04), and in boys (AUC = 0.59, 95% CI: 0.54–0.63; p = 0.03). The cardiorespiratory fitness cut-off associated with high cardiometabolic risk was the 55th percentile (sensitivity = 33.3%; specificity = 84.5%) in girls and the 60th percentile (sensitivity = 42.9%; specificity = 73.6%) in boys. These 20mSRT percentile thresholds can be used to identify children and adolescents who may benefit from lifestyle intervention. Nonetheless, further work involving different populations and cardiometabolic risk scores comprising of different variables are needed to confirm our initial findings. 相似文献
262.
Darren L. Richardson Michael J. Duncan Alfonso Jimenez Paul M. Juris Neil D. Clarke 《European Journal of Sport Science》2019,19(2):234-246
Objectives: To investigate the effects that high-velocity, low-load (HVLL) and low-velocity, high-load (LVHL) resistance exercise, performed once or twice-weekly, have on indices of functional performance (primary outcome), maximal strength, and body composition (secondary outcomes) in older adults.Methods: In a randomised, controlled, multi-armed, parallel design, 54 moderately-highly active, but resistance exercise naïve older adults (aged 60–79 years), attended baseline and post-10-week intervention assessment sessions. Physical and functional assessments were completed, and predicted one-repetition maximums (1-RM) were obtained for eight exercises. Participants were then randomised into one of five conditions: HVLL once-weekly (HVLL1: n?=?11) or twice-weekly (HVLL2: n?=?11), LVHL once-weekly (LVHL1: n?=?10) or twice-weekly (LVHL2: n?=?11), no-exercise control condition (CON: n?=?11). The HVLL conditions completed 3 sets of 14 repetitions at 40% 1-RM and the LVHL conditions, 3 sets of 7 repetitions at 80% 1-RM. In total, 50 participants completed all testing and were included in analyses.Results: Only LVHL2 improved 30-sec chair stand performance (p?=?.035; g?=?0.89), arm curls (p?=?.011; g?=?1.65) and grip-strength (p?=?.015; g?=?0.34) compared to CON. LVHL2 improved maximal strength compared to CON for 7/8 exercises (p?p?Conclusion: Possibly due to the lower intensity nature of the HVLL conditions, LVHL, twice-weekly was most beneficial for improving functional performance and strength in moderately-highly active older adults. Therefore, we recommend that exercise professionals ensure resistance exercise sessions have sufficient intensity of effort and volume, in order to maximise functional performance and strength gains in older adults. 相似文献
263.
We examined an alternative model to social skills and social competence training through conceptualizing social skills deficits according to a dichotomous model of either (a) not possessing the necessary skill in the behavioral repertoire or (b) possessing the skill but not using it appropriately. We hypothesized that many skills deficits could be explained by the latter interpretation. Using an ABAC design we compared the use of two behavioral monitoring systems: self‐monitoring and group monitoring of social skills while playing board games. The data suggest substantial increases in prosocial behaviors along with concomitant reductions in antisocial behaviors as a result of the two monitoring procedures. Data also show generalization across gaming situations and maintenance over time. Suggestions are presented for further research to isolate the role of self‐regulation in social skills research. © 2000 John Wiley & Sons, Inc. 相似文献
264.
Background:This study examined the volume and patterns of physical activity(PA) and sedentary time(ST) across different segments of the week among boys and girls.Methods:A total of 188 children aged 7-12 years wore a wrist-mounted ActiGraph GT3 X+accelerometer for 7 days.Time spent in PA and ST was calculated using ActiLife software.The mean number of minutes of light PA,moderate PA,vigorous PA,moderate-to-vigorous PA(MVPA),and ST were calculated per weekday(before school,during school,and after school) and per weekend day(morning and afternoon-evening).Results:After school represented the greatest accumulation of ST compared with before school and during school segments.Boys engaged in225.4 min/day of ST(95% confidence interval(CI):216-235),and girls engaged in 222.2 min/day of ST(95%CI:213-231).During school,boys engaged in significantly more MVPA than girls(46.1 min/day(95%CI:44-48) vs.40.7 min/day(95%CI:39-43)).Across the whole weekday,boys participated in significantly more MVPA than girls(103.9 min/day(95%CI:99-109) vs.95.7 min/day(95%CI:90-101)).The weekend afternoon—evening segment represented the larger accumulation of ST,where boys were significantly more sedentary than girls(367.5 min/day(95%CI:353-382) vs.339.8 min/day(95%CI:325-355),respectively).Conclusion:Our findings suggest that children are highly sedentary and spend little of their time in school in MVPA,especially girls.Routine breaks in school elicit increases in light PA and MVPA.Future work should consider the use of more active breaks within school time to encourage PA and reduce ST. 相似文献
265.
ABSTRACT
Background
Previous research into the association between aerobic fitness and physical activity in children is equivocal. However, previous research has always assumed that such an association was linear. This study sought to characterize the dose–response association between physical activity and aerobic fitness and to assess whether this association is linear or curvilinear and varies by sex, age and weight status. 相似文献266.
Online learning is usually implemented as a component of distance learning, although this technology also has definite advantages for residential educational institutions. When addressing issues such as computer literacy, improved communication skills, problem-based learning, inclusion of real-life issues and exposing students to the working world, the online environment holds tremendous potential. The first year journalism students at the Technikon Pretoria, South Africa, were incorporated in a carefully designed online course with assignments and activities to supplement and enrich their learning experience. This paper will report on the strategy that was implemented and will offer some suggestions when teaching a residential course online. Ajoutant la valeur du Net: la nature d'une éducation on-line dans une institution d'Afrique du Sud d'enseignement résidentiel. L'éducation on-line est généralement mise en m uvre comme une composante de l'enseignement À distance bien que cette technologie ait des avantages certaines pour les institutions donnant une éducation résidentielle. Lorsque l'on considère les problèmes comme l'aptitude À se servir de l'ordinateur, des aptitudes améliorés en communication, des apprentissages fondés sur l'étude de problèmes, l'inclusion de problèmes de la vie réelle et l'exposition des étudiants au monde du travail, l'environnement on-line offre un potentiel énorme. Les étudiants de la première année de journalisme au Technikon Pretoria, en Afrique du Sud ont été impliqués dans un cours on-line soigneusement planifié avec des devoirs et des activités qui complètent et enrichissent leur expérience d'apprentissage. Cet article fait rapport des stratégies qui ont été mise en m uvre et propose des suggestions pour un cours on-line en enseignement résidentiel. Der Vorteil des (Net) Netzwert: Online Ausbildung an einer Bildungseinrichtung in einer Wohngegend Süd Afrikas. Online lernen beschränkt sich am allgemeinen auf den Fernunterricht, obwohl diese Technologie Vorteile für Bildungseinrichtungen in einigen Wohngebieten bietet. Wenn es um Fragen geht wie: Computerfertigkeiten, Kommunikationsfähigkeiten zu verbessern, lernen auf der Basis von Problemlösungen, die Einbeziehung von Themen aus dem wirklichen Leben und die Schüler auf die Arbeitswelt vorzubereiten, bietet das online Umfeld ein enormes Potential. Die Studenten des Erstsemester für Journalistik am Technikon Pretoria, Süd-Afrika, wurden mit einem wohl geplanten online Kurs inklusive Aufgabenstellung konfrontiert, um ihre Lernerfahrungen auszubauen. Dieser Artikel berichtet über die angewandte Strategie und macht Unterrichtsvorschläge unter Einbeziehung von online Kursen in Wohngebieten. 相似文献
267.
Jeffrey M. R. Duncan‐Andrade 《Teaching Education》2013,24(4):339-350
This article examines the potential of critical teacher inquiry groups to promote urban teacher retention, professional support and development. While much has been written in recent years about teacher inquiry, generally, little attention has been paid to professional development programs that highlight a critical analysis of urban schooling. Drawing on analysis of videos of group meetings, Email conversations with participants and informal interviews, this article concerns itself with a group of seven South Central Los Angeles elementary teachers that use critical inquiry to support each other in tackling multiple forms of inequality and oppression manifest in their classrooms, school and community. Brought together by a commitment to social justice, these teachers engage a set of shared readings in social and educational theory as the foundation for bi‐monthly meetings. The article concludes with recommendations for on‐going critical professional development models that support teachers as they confront the challenges of urban schools. 相似文献
268.
This article presents a systematic process, or model, that will assist the practicing professional to manage new performance improvement ideas from introduction to sustainable implementation. The model identifies vetting steps that must be addressed for implemented projects to be sustainable over time. The paper concludes with 10 vital performance improvement project management lessons. 相似文献
269.
This article explores the development and automation of quality assurance procedures for locally loading electronic books (ebooks) on the Ontario Council of University Libraries’ Scholars Portal Platform. The authors conducted a two-phase study of MARC record fields indexed on the platform to detect errors and implement workflow changes to the quality control process. The authors report on this process and the costs involved and suggest that the challenges of ebook metadata are not met by MARC and a new metadata standard should be considered in the near future. 相似文献
270.