Different visual stimuli affect muscle activation at the knee during sidestepping     

Marcus J.C. Lee  David G. Lloyd  Brendan S. Lay    Jacqueline A. Alderson 《Journal of sports sciences》2019,37(10):1123-1128

Increasing knee stability via appropriate muscle activation could reduce anterior cruciate ligament (ACL) injury risk during unplanned sidestepping. High-level athletes may activate their knee muscles differently from low-level athletes when responding to quasi-game realistic versus non game-realistic stimuli. Eleven high-level and 10 low-level soccer players responded to a non game-realistic arrow-planned condition (AP), a quasi game-realistic one-defender scenario (1DS) and two-defender scenario (2DS), and an arrow-unplanned condition (AUNP), that imposed increasing time constraints to sidestep. Activation from eight knee muscles during sidestepping was measured during pre-contact and weight-acceptance. Knee flexor-extensor co-activation ratios were established. Muscle activation levels increased by approximately 27% solely in the 1DS in both sidestepping phases. In the 2DS, the shift from a flexor dominant co-activation strategy in pre-contact toward extensor dominance in weight-acceptance commenced earlier for the high-level players. Quasi game-realistic information allowed for anticipatory increases in knee muscle activation regardless of expertise levels but only when the time demands to respond were low (1DS). High-level players were better at interpreting complex game-realistic information (2DS) to activate their knee extensors earlier in preparation for single-leg landing during weight-acceptance.  相似文献   

Electronic Learning Delivery Systems: A Selection Model     

Peter J. Pallesen  Paul Haley  Edward S. Jones  Bobbie Moore  Dina E. Widlake  Karen L. Medsker 《Performance Improvement Quarterly》1999,12(4):7-32

Electronic learning delivery systems discussed include satellite networks, teleconferencing, Internet/Intranet networks, desktop multimedia, electronic performance support systems (EPSS), transportable audio/video (i.e., systems relying primarily on physically transportable audio-and videotaped materials), and the electronically enhanced classroom. Selecting one of these systems can be a daunting task when all relevant issues are considered. The selection model described in this article narrows the choices to the system most likely to be instructionally, economically, and technologically appropriate. After establishing working definitions, the model suggests four stages of user activity: 1) Assessing several important overall factors, including outcomes and conditions of learning, economics, synchronicity and location, and organizational culture; 2) Rating the importance of several learning system attributes to the training project; 3) Selecting the system that most ideally supports the attributes which the user has rated as important; and finally, 4) Validating the selection by reviewing the final choice in light of first stage overall factors.  相似文献   

Nameability supports rule-based category learning in children and adults     

Martin Zettersten  Catherine Bredemann  Megan Kaul  Kaitlynn Ellis  Haley A. Vlach  Heather Kirkorian  Gary Lupyan 《Child development》2024,95(2):497-514

The present study tested the hypothesis that verbal labels support category induction by providing compact hypotheses. Ninety-seven 4- to 6-year-old children (M = 63.2 months; 46 female, 51 male; 77% White, 8% more than one race, 4% Asian, and 3% Black; tested 2018) and 90 adults (M = 20.1 years; 70 female, 20 male) in the Midwestern United States learned novel categories with features that were easy (e.g., “red”) or difficult (e.g., “mauve”) to name. Adults (d = 1.06) and—to a lesser extent—children (d = 0.57; final training block) learned categories composed of more nameable features better. Children's knowledge of difficult-to-name color words predicted their learning for categories with difficult-to-name features. Rule-based category learning may be supported by the emerging ability to form verbal hypotheses.  相似文献   

Kinematic analyses of seated throwing activities with and without an assistive pole     

Brendan Burkett  Mark Connick  Mark Sayers  Luke Hogarth  Tom Stevens  Mike Hurkx  Sean Tweedy 《Sports Engineering》2017,20(2):163-170

In Paralympic seated throwing events, the athlete can throw with and without an assistive pole. This study aimed to identify and compare performance-related kinematic variables associated with both seated throwing techniques. Twenty-nine non-disabled males (21.9 ± 2.6 years) performed 12 maximal throws using a 1-kg ball in two conditions (no-pole and pole). Automatic 3D-kinematic tracking (150 Hz) and temporal data were acquired. There was no significant difference between ball speeds at the point of release between conditions (no-pole = 12.8 ± 1.6 m/s vs. pole = 12.9 ± 1.5 m/s). There were four kinematic variables that were strongly correlated with ball speed when throwing with or without an assistive pole. These variables were elbow flexion at the start phase (pole r = .39 and no-pole r = .41), maximum shoulder external rotation angular velocity during the arm cocking phase (pole r = .42), maximum shoulder internal rotation angular velocity during the arm acceleration phase (pole r = .47), and should internal rotation angular velocity at the instant of ball release (pole r = .40). The pole clearly influenced the throwing technique with all four strongly correlated variables identified in this condition, compared to only one during the no-pole condition. When using the pole, participants produced significantly higher shoulder internal rotation angular velocities during the arm acceleration phase (pole = 367 ± 183°/s vs. no-pole = 275 ± 178°/s, p < .05) and at the instant of ball release (pole = 355 ± 115°/s vs. no-pole = 264 ± 120°/s, p < .05), compared to throwing without the pole. These findings have implications for the development of evidence-based classification systems in Paralympic seated throwing, and facilitate research that investigates the impact of impairment on seated throwing performance.  相似文献   

Transnational Mobility and International Academic Employment: Gatekeeping in an Academic Competition Arena     

Brendan Cantwell 《Minerva》2011,49(4):425-445

This article draws upon concepts developed in recent empirical and theoretical work on high skilled and academic mobility and migration including accidental mobility, forced mobility and negotiated mobility. These concepts inform a situated, qualitative study of mobility among international postdoctoral researchers in life sciences and engineering fields who were employed at US and UK universities in 2008 and 2009. Informed by epistemological methods in the Foucauldian tradition of discourse and governmentality, the study explores how policy discourse and technologies empower and limit scientists and engineers in negotiating employment arrangements across national boundaries.  相似文献   

Sensitivity Training as an Integral Phase of Counselor Education     

W. Brendan Reddy 《Counselor Education & Supervision》1970,9(2):110-115

A four-day T-Group was conducted conjointly with counselor education staff members and practicum students. At the end of the T-Group significant gains were made on the Barrett-Lennard Relationship Inventory, a measure of Rogers' conditions of a helping relationship. Three months later clients of the group members rated them on the same measure. A number of significant correlations were found. A follow-up questionnaire anecdotally supported the findings.  相似文献   

Supplementation of urban home visitation with a series of group meetings for parents and infants: results of a "real-world" randomized, controlled trial     

Constantino JN  Hashemi N  Solis E  Alon T  Haley S  McClure S  Nordlicht N  Constantino MA  Elmen J  Carlson VK 《Child abuse & neglect》2001,25(12):1571-1581

OBJECTIVE: Home visitation has been shown to be effective in reducing rates of child maltreatment and in enhancing psychosocial outcomes in children and their parents. Even when available, however, it is underutilized by parents in some urban settings. We tested a supplemental 10-session group intervention for its ability to increase active participation in home visitation, enhance the quality of caregiving behavior of parents, and improve social developmental outcome in children. METHOD: A randomized controlled design was utilized, involving two separate cohorts of parents of 3- to 18-month old infants, totaling 148 parent-child dyads. The intervention focused on practical experience in promoting parent-infant attachment relationships. RESULTS: At 6 months follow-up, there was a substantial increase in the proportion of intervention group parents participating in home visitation, compared to parents in the control group (Fisher's exact p = .008). Parents in the intervention group exhibited a trend for improvement in their capacity to appropriately interpret infants' emotional cues (p = .08), independent of the effects of home visitation itself. Attrition in both the treatment and control groups was inversely associated with income and level of education. CONCLUSIONS: Group meetings may constitute an effective means of engaging stressed urban families in home visitation.  相似文献   

Dyslexia in Chinese: Clues from cognitive neuropsychology   总被引：5，自引：0，他引：5  

Wen?Gang?Yin  Brendan?Stuart?WeekesEmail author 《Annals of dyslexia》2003,53(1):255-279

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Contextually responsive transfer: Perceptions of NNES on an ESL/EFL teacher training programme     

Indika Liyanage  Brendan John Bartlett 《Teaching and Teacher Education》2008

Post-training reflections from nine overseas NNES students were recorded in relation to the extent to which they perceived potential applications of what they had learned in a Contextually Responsive Teacher Training (CRTT) programme in the learning–teaching contexts into which they were returning as English as a Second or Foreign Language (ESL/EFL) teachers. Pragmatic issues in home contexts concerning resources generally and textbooks particularly were seen to threaten the viability of what was learned. Significantly, all participants projected disillusion with home country context rather than with foreign country training as a personal resolution of the mismatch. Implications are drawn for preventative redesign in relation to the Australian programmes.  相似文献   

The symbiotic roles of action research,lesson study and learning study seen in a social–emotional intervention for males with behavioural needs     

Brendan Kwiatkowski 《Educational Action Research》2019,27(4):613-630

ABSTRACT

To help a group of nine adolescent boys with behavioural needs improve their social-emotional skills, the researcher designed and conducted a longitudinal intervention at a public secondary school in British Columbia. In order to complete this task, the researcher drew on the various strengths of action research, lesson study and learning study. Together their distinct attributes acted as an organizational framework and were seen to provide an effective and robust approach to school-based research. The action research component of the study ensured that the intervention had a deep understanding of the problems facing male students with behavioural needs, that stakeholders’ voices were considered in the research and that the personal role of the researcher was acknowledged. Learning study established positive masculinity as the intervention’s primary object of learning; and it helped influence the content and approach of individual sessions. Finally, lesson study’s fluid and collaborative approach to assessment allowed for ongoing guidance and a more comprehensive and nuanced understanding of the study’s results. Although there are similarities between action research, learning and lesson studies, the research discussed in this article demonstrates the efficacy and benefit in allowing their distinctive strengths to be used in conjunction for a longitudinal intervention.  相似文献