The Structure of Achievement and Behavior across Middle Childhood     

Lori Kowaleski-Jones  & Greg J. Duncan 《Child development》1999,70(4):930-943

This research used data from the National Longitudinal Survey of Youth (NLSY) to describe and model developmental trajectories across middle childhood. Our sample consisted of approximately 1,000 children of NLSY women who were aged 6 to 7 years in either 1986 or 1988. Assessments of PIAT math and reading scores and the mother-reported Behavior Problem Index in 1986, 1988, 1990, and 1992 provided data for middle-child trajectories of children aged 6 to 7 in 1986. Assessments in 1988, 1990, 1992, and 1994 provided data for children aged 6 to 7 in 1988. We used the raw score form of these data to estimate LISREL-based models of their autoregressive structure. As with other samples, average math and reading achievement trajectories were parabolic for NLSY children, with scores increasing at a decreasing rate over this period. Average behavior-problem trajectories were flat. Behind these average shapes was extreme diversity in level (and in some cases, slopes), of individual trajectories and a pronounced tendency for above average changes between two adjacent assessments to be followed by opposite-signed changes in the subsequent period. Estimates from our structural models showed great heterogeneity in the average level of achievement and behavior for all three outcomes and heterogeneous slopes for reading scores as well. Boys but not girls were found to have heterogeneous slopes for math and behavior problems, whereas girls but not boys showed a significantly higher degree of persistence if "shocked" off of their expected trajectories.  相似文献   

The social field(s) of arts education today: living vulnerability in neo-liberal times     

Greg Dimitriadis  Emily Cole  Adrienne Costello 《Discourse: Studies in the Cultural Politics of Education》2009,30(4):361-379

The arts are often seen as peripheral to the ‘real business’ of school and schooling. While this has been the case for some time now, the increasing pressures of high-stakes testing and ever-more draconian public funding schemes (particularly in the wake of 9/11) have created something of a ‘perfect storm’ for those working in the arts. Arts proponents today live and operate within a culture of scarcity, having to justify their increasingly marginalized vocations while competing for continually shrinking resources. The result is an often deep-bodied sense of vulnerability, one which saturates the social field (both micro and macro) of arts education in ways not often publicly acknowledged. In this article, I explore this notion of ‘vulnerability’ as a framework for understanding qualitative data which emerged from a three-year arts and education project I conducted in a large, northeast city in the USA beginning in 2003. In so doing, I look to open up a broader discussion about the oft-ignored intersection(s) between the material and aesthetic in arts and education – a discussion which is sober about the future of such work in times of economic scarcity and conservative retrenchment.  相似文献   

Strategies and Intervening Factors Influencing Student Social Interaction and Experiential Learning in an Interdisciplinary Research Team     

Laura Ryser  Greg Halseth  Deborah Thien 《Research in higher education》2009,50(3):248-267

Faculty have long incorporated students into interdisciplinary research projects to meet increasingly common demands for collaborative research by federal funding agencies. Despite the critical role of experiential learning in building student research skills and capacity, few have explored social interaction mechanisms used to facilitate student experiential learning in an interdisciplinary research team. Drawing upon the New Rural Economy project as a case study, interviews with 13 students from eight Canadian universities were conducted to explore these social interaction mechanisms. While findings revealed an array of social interaction mechanisms used to develop student learning networks, the quality of these mechanisms were mixed; thereby influencing the utilization of these networks for guidance and feedback. As faculty organize social interaction mechanisms, they should consider factors such as previous experience, student and faculty relationships, finances, language, gender, ethnicity, and other issues, that will have an impact on student engagement with experiential learning.

Deborah ThienEmail:

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School psychologists' perceptions regarding the practice of identifying reading disabilities: Cognitive assessment and response to intervention considerations     

Greg R. Machek  Jason M. Nelson 《Psychology in the schools》2010,47(3):230-245

This study surveyed a national sample of school psychologists with respect to the identification of reading disabilities (RD). It covers school psychologists' opinions regarding perceived benefits of the use of cognitive assessment in RD identification, both within and outside of an IQ–achievement discrepancy model. The survey also solicited opinions about the nature of RD, particularly conceptions of general slow learners (and readers) versus those evidencing a discrepancy. Results related to school psychologists' concerns about job security, should IQ testing be reduced, are presented. Furthermore, the perceived benefits of a Response to Intervention (RTI) model, how school psychologists see themselves contributing to an RTI effort, as well as possible hurdles to RTI implementation are covered. Measurement of these perceptions may be beneficial in informing current and future service delivery models for RD identification as well as possible training needs of currently practicing school psychologists. Finally, the current work represents an effort to measure assessment acceptability for RD identification techniques. © 2010 Wiley Periodicals, Inc.  相似文献   

Establishing a practical treadmill sprint as an alternative to the Wingate anaerobic test     

Greg L. McKie  Hashim Islam  Logan K. Townsend  Greg J. Howe 《Measurement in physical education and exercise science》2018,22(2):138-144

This study examined the validity and reliability of a 30-second running sprint test using two non-motorized treadmills compared to the established Wingate Anaerobic Test. Twenty-four participants completed three sessions in a randomized order on a: (1) manual mode treadmill (Woodway); (2) specialized interval training treadmill (HiTrainer); and (3) Wingate cycle ergometer. In a subset of 15 participants, 2 additional sessions were completed on both treadmills to establish the test–retest reliability. Peak (Woodway: r = .68; HiTrainer: r = .58; p < .003), average (Woodway: r = .82; HiTrainer: r = .72, p < .001), and minimum (Woodway: r = .64; HiTrainer: r = .42, p < .043) speed indices were moderately to very strongly correlated with corresponding Wingate Anaerobic Test outputs and had excellent test–retest reliability (all intraclass correlation coefficients > .75). Fatigue index during the Wingate Anaerobic Test (51.20 ± 7.14%) was moderately correlated with the Woodway (32.9 ± 10.9%, r = .55, p = .005) only. This 30-second running sprint test may be a valid and reliable mode-specific alternative to the Wingate Anaerobic Test.  相似文献   

The effects of limb dominance and a short term,high intensity exercise protocol on both landings of the vertical drop jump: implications for the vertical drop jump as a screening tool     

Enda F. Whyte  Patrick Kennelly  Oliver Milton  Chris Richter  Siobhán O’Connor  Kieran A. Moran 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(4):541-553

The effectiveness of vertical drop jumps (VDJs) to screen for non-contact ACL injuries is unclear. This may be contributed to by discrete point analysis, which does not evaluate patterns of movement. Also, limited research exists on the second landing of VDJs, potential lower limb performance asymmetries and the effect of fatigue. Statistical parametric mapping investigated the main effects of landing, limb dominance and a high intensity, intermittent exercise protocol (HIIP) on VDJ biomechanics. Twenty-two male athletes (21.9 ± 1.1 years, 180.5 ± 5.5 cm, 79.4 ± 7.8 kg) performed VDJs pre- and post-HIIP. Repeated measures ANOVA identified pattern differences during the eccentric phases of the first and second landings bilaterally. The first landing displayed greater (internal) knee flexor (η² = 0.165), external rotator (η² = 0.113) and valgus (η² = 0.126) moments and greater hip (η² = 0.062) and knee (η² = 0.080) flexion. The dominant limb generated greater knee flexor (η² = 0.062), external rotator (η² = 0.110) and valgus (η² = 0.065) moments. The HIIP only had one effect, increased thoracic flexion relative to the pelvis (η² = 0.088). Finally, the dominant limb demonstrated greater knee extensor moments during the second landing (η² = 0.100). ACL injury risk factors were present in both landings of VDJs with the dominant limb at potentially greater injury risk. Therefore, VDJ screenings should analyse both landings bilaterally.  相似文献   

Mathematics in early childhood: Teacher educators’ accounts of their work     

Kristin Lyn Whyte  M. Abigail Stein  Debbie Kim  Natalie Jou  Cynthia E. Coburn 《Journal of Early Childhood Teacher Education》2018,39(3):213-231

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‘All of us together in a blurred space’: principles for co-creating curriculum with international partners     

Rebecca Bilous  Laura Hammersley  Kate Lloyd  Felicity Rawlings-Sanaei  Greg Downey  Maria Amigo 《International Journal for Academic Development》2018,23(3):165-178

This paper shares an innovative methodology to ‘co-create’ a curriculum with eleven international community development organisations from seven countries to prepare undergraduate students for international work-integrated learning activities. The co-creation process was complex, messy, and always evolving. Here we reflect on and document the process, identifying three key methodological principles that might guide the co-creation process for others. These principles embrace the unpredictable, emotional, and personal reality of bringing together diverse ideas and perspectives, as well as opening up possibilities for more creative ways of communicating and listening to what is seen, heard, and felt.  相似文献   

Comparison of physiological responses to morning and evening submaximal running     

L. Martin  A.L. Doggart  G.P. Whyte 《Journal of sports sciences》2013,31(12):969-976

The aim of this study was to assess the effect of time of day on physiological responses to running at the speed at the lactate threshold. After determination of the lactate threshold, using a standard incremental protocol, nine male runners (age 26.3 - 5.7 years, height 1.77 - 0.07 m, mass 73.1 - 6.5 kg, lactate threshold speed 13.6 - 1.6 km· h -1 ; mean - s ) completed a standardized 30 min run at lactate threshold speed, twice within 24 h (07:00- 09:00 h and 18:00-21:00 h). Core body temperature, heart rate, minute ventilation, oxygen uptake, carbon dioxide expired, respiratory exchange ratio and capillary blood lactate were measured at rest, after a warm-up and at 10, 20 and 30 min during the run. In addition, the rating of perceived exertion was reported every 10 min during the run. Significant diurnal variation was observed only for body temperature (36.9 - 0.9°C vs 37.3 - 0.3°C) and respiratory exchange ratio at rest (0.86 - 0.01 vs 0.89 - 0.07) ( P ? 0.05). Diurnal variation persisted for body temperature throughout the warm-up (37.1 - 0.2°C vs 37.5 - 0.3°C) and during exercise (36.2 - 0.6°C vs 38.6 - 0.4°C), but only during the warm-up for the respiratory exchange ratio (0.85 - 0.05 vs 0.87 - 0.02) ( P ? 0.05). The rating of perceived exertion was significantly elevated during the morning trial (12.7 - 0.9 vs 11.9 - 1.2) ( P ? 0.05). These findings suggest that, despite the diurnal variation in body temperature, other physiological responses to running at lactate threshold speed are largely unaffected. However, a longer warm-up may be required in morning trials because of a slower increase in body temperature, which could have an impact on ventilation responses and ratings of perceived exertion.  相似文献   

Science and cycling: current knowledge and future directions for research     

Greg Atkinson  Richard Davison  Asker Jeukendrup  Louis Passfield 《Journal of sports sciences》2013,31(9):767-787

Abstract

In this holistic review of cycling science, the objectives are: (1) to identify the various human and environmental factors that influence cycling power output and velocity; (2) to discuss, with the aid of a schematic model, the often complex interrelationships between these factors; and (3) to suggest future directions for research to help clarify how cycling performance can be optimized, given different race disciplines, environments and riders. Most successful cyclists, irrespective of the race discipline, have a high maximal aerobic power output measured from an incremental test, and an ability to work at relatively high power outputs for long periods. The relationship between these characteristics and inherent physiological factors such as muscle capilliarization and muscle fibre type is complicated by inter-individual differences in selecting cadence for different race conditions. More research is needed on high-class professional riders, since they probably represent the pinnacle of natural selection for, and physiological adaptation to, endurance exercise. Recent advances in mathematical modelling and bicycle-mounted strain gauges, which can measure power directly in races, are starting to help unravel the interrelationships between the various resistive forces on the bicycle (e.g. air and rolling resistance, gravity). Interventions on rider position to optimize aerodynamics should also consider the impact on power output of the rider. All-terrain bicycle (ATB) racing is a neglected discipline in terms of the characterization of power outputs in race conditions and the modelling of the effects of the different design of bicycle frame and components on the magnitude of resistive forces. A direct application of mathematical models of cycling velocity has been in identifying optimal pacing strategies for different race conditions. Such data should, nevertheless, be considered alongside physiological optimization of power output in a race. An even distribution of power output is both physiologically and biophysically optimal for longer ( >4km) time-trials held in conditions of unvarying wind and gradient. For shorter races (e.g. a 1km time-trial), an‘all out’ effort from the start is advised to‘save’ time during the initial phase that contributes most to total race time and to optimize the contribution of kinetic energy to race velocity. From a biophysical standpoint, the optimum pacing strategy for road time-trials may involve increasing power in headwinds and uphill sections and decreasing power in tailwinds and when travelling downhill. More research, using models and direct power measurement, is needed to elucidate fully how much such a pacing strategy might save time in a real race and how much a variable power output can be tolerated by a rider. The cyclist's diet is a multifactorial issue in itself and many researchers have tried to examine aspects of cycling nutrition (e.g. timing, amount, composition) in isolation. Only recently have researchers attempted to analyse interrelationships between dietary factors (e.g. the link between pre-race and in-race dietary effects on performance). The thermal environment is a mediating factor in choice of diet, since there may be competing interests of replacing lost fluid and depleted glycogen during and after a race. Given the prevalence of stage racing in professional cycling, more research into the influence of nutrition on repeated bouts of exercise performance and training is required.  相似文献