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111.
This systematic review presents research on the physical activity levels of preschool-aged children (aged 2–6 years). Thirty-nine primary studies (published 1986–2007) representing a total of 10,316 participants (5236 male and 5080 female), from seven countries are described and the physical activity behaviors of this population are considered in accordance with the National Association for Sport and Physical Education (NASPE) physical activity guidelines for preschoolers. Upon review of the evidence, it is apparent that nearly half of preschool-aged children do not engage in sufficient physical activity. Current recommendations suggest a minimum of 60 min of physical activity per day; only 54% of participants throughout the studies achieved this. Furthermore, as with other age groups, boys participate in considerably more physical activity than girls. It is clear from this systematic review that nearly half of children studied are not meeting the recommended guidelines for physical activity. Therefore, effective interventions that promote and foster physical activity in children are necessary, especially in females. However, a more objective physical activity guideline for preschoolers is necessary; measurement of activity needs to become more unified to compare and track activity more effectively. 相似文献
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期末考试结束了,终于可以放假了!你想怎样度过这个暑假呢?是和朋友们痛痛快快地玩一场,还是在这个暑假实施你早已制定好的暑期计划呢? 相似文献
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The Language ENvironment Analysis system (LENA) records children’s language environment and provides an automatic estimate of adult–child conversational turn count (CTC). The present study compares LENA’s CTC estimate to manually coded CTC on a sample of 70 English-speaking infants recorded longitudinally at 6, 10, 14, 18, and 24 months of age. At each age, LENA’s CTC was significantly higher than manually coded CTC (all ps < .001, Cohen’s ds: 0.9–2.05), with the largest discrepancies between the two methods observed at younger ages. The Limits of Agreement Analyses confirm wide disagreements between the two methods, highlighting potential problems with automatic measurement of parent–infant verbal interaction. These findings suggest that future studies should validate LENA’s CTC estimates with manual coding. 相似文献
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Science & Education - Learning science in the context of socio-scientific issues (SSI) can promote scientific literacy that links science to everyday life and society. In this position paper,... 相似文献
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Fara P 《Endeavour》2005,29(3):101-103
With their mythical creatures and arcane symbolism, coats of arms seem to have little connection with modern science. Yet despite its chivalric origins, the ancient language of heraldry has long fascinated famous scientists. Although this idiosyncratic tradition was parodied by Victorian geologists, who laughingly replaced unicorns and griffins with images of dinosaurs that they had recently discovered, it has been perpetuated since by Ernest Rutherford, who liked to present himself as a new alchemist. 相似文献
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Patricia J. Bauer Jennifer Wenner Patricia L. Dropik & Sandi S. Wewerka 《Monographs of the Society for Research in Child Development》2000,65(4):172-183
In addition to the variables of interest in this research (namely, age, delay, sequence type, mode of experience, and verbal reminders), children's performance may have been affected by a number of features of the research design. This Appendix is a report of the results of analyses of three potential influences on the children's performance. First, we examined the possibility that the particular experimenter who conducted the session might have affected the children's performance. Second, we examined the possibility that conclusions regarding children's recall of the event sequences were qualified by specific event sequence effects. Third, we examined the possibility that differences in the lengths of the child-controlled response periods might account for the patterns of effects observed. Although in each case some effects obtained, in no case did the findings present substantive qualifications to the major patterns described in the body of the text. 相似文献
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