Vertical jumping and leg power normative data for English school children aged 10–15 years     

Matthew J. D. Taylor  Daniel Cohen  Christine Voss  Gavin R. H. Sandercock 《Journal of sports sciences》2013,31(8):867-872

Abstract

Although vertical jumping is often incorporated into physical activity tests for both adults and children, normative data for children and adolescents are lacking in the literature. The objectives of this study were to provide normative data of jump height and predicted peak leg power for males and females aged 10.0–15.9 years. Altogether, 1845 children from 12 state primary and secondary schools in the East of England participated in the study. Each child performed two countermovement jumps, and jump height was calculated using a NewTest jump mat. The highest jump was used for analysis and in the calculation of predicted peak power. Jump height and predicted peak leg power were significantly higher for males than females from the age of 11 years. Jump height and peak power increased significantly year on year for males. For females, jump height and predicted peak leg power reached a plateau after age 12 and 13 years respectively. This study provides normative data that can be used as a tool to classify jumping performance in children aged 10–15 years.  相似文献   

Benefits of achieving vigorous as well as moderate physical activity recommendations: Evidence from heart rate complexity and cardiac vagal modulation     

Luisa Soares-Miranda  Gavin Sandercock  Susana Vale  Pedro Silva  Carla Moreira  Rute Santos 《Journal of sports sciences》2013,31(10):1011-1018

Abstract

The aim of this study was to examine differences in traditional heart rate variability measurements and heart rate complexity (sample entropy) in young adults grouped by objectively measured achievement of either moderate or both moderate and vigorous physical activity recommendations. Of 168 young adults tested (86 females, 82 males; age 20.5 ± 1.2 years), 119 achieved only recommendations for moderate physical activity (moderate group) and 49 achieved recommendations for both moderate and vigorous physical activity (vigorous group). Analysis of covariance controlling for sex, weekly minutes of moderate physical activity, and percentage of body fat was used to assess between-group differences in heart rate variability and heart rate complexity. Logistic regression analysis was used to determine the group characteristics that best predicted high heart rate complexity and vagal indices of heart rate variability. The majority of the autonomic measures were higher (P < 0.05) in the vigorous group, and regression analysis showed that vigorous physical activity was the only multivariate predictor of higher heart rate complexity and higher heart rate variability. Young adults engaged in regular vigorous physical activity were more than twice as likely to have high heart rate complexity than those involved in predominantly moderate exercise. These findings suggest that vigorous physical activity is more closely associated with high heart rate complexity than moderate physical activity in young adults.  相似文献   

Centile curves and normative values for the twenty metre shuttle-run test in English schoolchildren     

Gavin Sandercock  Christine Voss  Daniel Cohen  Matthew Taylor  D. M. Stasinopoulos 《Journal of sports sciences》2013,31(7):679-687

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Muscular development motives for exercise participation: The missing variable in current questionnaire analysis?     

Gavin M. Loze  David J. Collins 《Journal of sports sciences》2013,31(8):761-767

Motivation questionnaires that are currently validated do not account for muscular development motives in exercise populations, and have rarely been used to examine resistance training populations. Resistance training is a popular and widely available exercise, so the lack of such motivational information is a cause for concern. The aim of this study was to assess the need for considering motives for muscular development. This was achieved by the development of a simple scale that matched the format and style of the Exercise Motivations Inventory. The muscular development scale was combined with the ‘weight management’ and ‘appearance’ items of the Exercise Motivations Inventory to form a 13-item test questionnaire. This was administered to four groups of experienced exercisers: resistance training males (n = 40), resistance training females (n = 36), males training in a variety of sports (n = 27) and aerobic training females (n = 40). Factor analysis with varimax rotation revealed a relatively distinct muscular development factor, but with cross-loading on weight management. Muscular development was shown to be the most effective discriminator for the four groups. A multivariate analysis of variance and additional discriminant analysis revealed a series of significant differences between groups, which suggests that motive-based differences are more powerful than sex factors in determining choice of exercise modality. Although the interrelated nature of muscular development and weight management needs to be recognized and accounted for, there is a clear need for considering muscular development motives in future investigations, especially those that intend to examine motives for ‘ideal’ physical appearance.  相似文献   

Internal and External Focus of Attention in a Novice Form Sport     

Gavin P. Lawrence  Vicky M. Gottwald  James Hardy  Michael A. Khan 《Research quarterly for exercise and sport》2013,84(3):431-441

Abstract

In the current experiment, we examined optimal focus for novices during a movement sequence in which performance was measured on accurate movement form/technique. A novel gymnastics routine was practiced under either an internal skill-relevant, internal skill-irrelevant, external, or no attention focus. Retention and transfer tests were then completed. During acquisition, adopting an internal irrelevant focus significantly improved performance, whereas an external focus degraded performance. There were no significant group differences in the retention and transfer tests. This suggests that learning of movement form/technique did not benefit from a specific focus of attention. The results are interpreted via an attentional capacity viewpoint and the notion that form tasks do not always contain obvious movement effects central to common coding and the constrained action hypothesis.  相似文献   

‘Old’ Football and the ‘New’ Codes: Some Thoughts on the ‘Origins of Football’ Debate and Suggestions for Further Research     

Gavin Kitching 《国际体育史杂志》2013,30(13):1733-1749

A close reading of recent contributions to the ‘origins of football’ debate suggests that there is now more consensus among scholars about the broad sequence of events than is rhetorically allowed. However, this consensus itself rests on some shared conceptual and methodological illusions. These include: a continual naivety about the use of the name ‘football’ in the primary source materials; asystematic underestimation of forms of play (and a collateral overestimation of the importance of rules and codifications) in the development of football; and, above all, a widely shared, and very dubious, conviction that the pursuit of the historical origins of football is a meaningful activity. This article analyses each ofthese illusions in turn and suggests some methodological and substantive alternatives to them. These alternatives sum to the conclusion that the origin of both modern football codes is a far more remarkable and many-sided story than has been appreciated, even in the very best research to date. Moreover, it is a story whose many dimensions and implications go well beyond the borders of Britain, and indeed beyond the history of ‘soccer’ or ‘rugby’ alone.  相似文献   

Teacher beliefs about feedback within an assessment for learning environment: Endorsement of improved learning over student well-being     

Gavin T.L. Brown  Lois R. HarrisJennifer Harnett 《Teaching and Teacher Education》2012

Teachers’ understandings of feedback probably influence the type and quality of feedback that they provide. The beliefs of 518 New Zealand practicing teachers about feedback were evaluated with the Teachers’ Conceptions of Feedback (TCoF) inventory and related to practices these teachers considered to be feedback. Nine feedback factors and four practices factors were found and models were statistically invariant between primary and secondary teachers. New Zealand teachers’ understandings of feedback were strongly focused on improving learning instead of enhancing student well-being. Similar factors are expected in other contexts, though agreement rates should reflect local policy priorities and cultural values.  相似文献   

Alignment Between the Science Curriculum and Assessment in Selected NY State Regents Exams     

Xiufeng Liu  Gavin Fulmer 《Journal of Science Education and Technology》2008,17(4):373-383

This article reports on an analysis of alignment between NY state core curricula and NY Regents tests in physics and chemistry. Both the curriculum and test were represented by a two dimensional table consisting of topics and cognitive demands. The cell values of the table were numbers of major understandings in the curriculum and points of test items in the test. The Porter alignment index was computed for each test. It was found that, overall, there was a high alignment between the NY core curriculum and the NY Regents test, and the alignment remained fairly stable from test to test. However, there were considerable discrepancies in emphases on different cognitive levels and topics between the core curriculum and the test. Issues related to the nature of alignment, and the nature and validity of content standards were raised, and implications for science curriculum and instructions were also discussed.  相似文献