The kinematic differences between accurate and inaccurate squash forehand drives for athletes of different skill levels     

Benjamin K. Williams  Ross H. Sanders  Joong Hyun Ryu  Philip Graham-Smith  Peter J. Sinclair 《Journal of sports sciences》2020,38(10):1115-1123

ABSTRACT

To maintain the accuracy of squash shots under varying conditions, such as the oncoming ball’s velocity and trajectory, players must adjust their technique. Although differences in technique between skilled and less-skilled players have been studied, it is not yet understood how players vary their technique in a functional manner to maintain accuracy under varying conditions. This study compared 3-dimensional joint and racket kinematics and their variability between accurate and inaccurate squash forehand drives of 9 highly skilled and 9 less-skilled male athletes. During inaccurate shots, less-skilled players hit the ball with a more open racket, demonstrating a difference in this task-relevant parameter. No joint kinematic differences were found for accuracy for either group. Coordinated joint rotations at the elbow and wrist both displayed a “zeroing-in” effect, whereby movement variability was reduced from the initiation of propulsive joint rotation to a higher consistency at ball-impact; potentially highlighting the “functionality” of the variability prior to the impact that enabled consistent task-relevant parameters (racket orientation and velocity) under varying conditions. Further, highly skilled players demonstrated greater consistency of task-relevant parameters at impact than less-skilled players. These findings highlight the superior ability of highly skilled players to adjust their technique to achieve consistent task-relevant parameters and a successful shot.  相似文献   

Democratic Discord in Schools: Cases and Commentaries in Educational Ethics     

Kathy Hytten 《Educational theory》2020,70(3):377-383

  相似文献   

日本饮食礼仪     

Adrien-Luc Sanders 《海外英语》2008,(9):23

虽然日本的饮食礼仪中需要注意的地方不太多,但作为了解一个国家文化和风俗的必经之路,了解他们的饮食礼仪也是非常必要的,作为东方文化的一部分,它也会让西方人费一番心思.……  相似文献   

Addressing Ethnic Conflict through Peace Education: International Perspectives - Edited by Zvi Bekerman and Claire McGlynn     

Kathy  Bickmore 《British Journal of Educational Studies》2008,56(2):236-240

  相似文献   

Within and Across Language Predictors of Word Learning Processes in Dual Language Learners     

Amy Pace  Rufan Luo  Dani Levine  Aquiles Iglesias  Jill de Villiers  Roberta M. Golinkoff  Mary S. Wilson  Kathy Hirsh-Pasek 《Child development》2021,92(1):35-53

This study investigated the relation between Dual Language Learners’ (N = 90) vocabulary and grammar comprehension and word learning processes in preschool (aged 3-through-5 years). Of interest was whether: (a) performance in Spanish correlated with performance in English within each domain; and (b) comprehension predicted novel word learning within and across languages. Dual-language experience was evaluated as a potential moderator. Hierarchical linear modeling revealed stronger predictive associations within each language than across languages. Across languages, results varied by experience and domain. Structural sensitivity theory suggests exposure to two languages heightens awareness of parameters along which languages vary and provides a framework for interpreting complex associations within and across languages. Knowledge from one language may influence learning in both.  相似文献   

Child abuse fatalities and cases of extreme concern: lessons from reviews     

Sanders R  Colton M  Roberts S 《Child abuse & neglect》1999,23(3):257-268

OBJECTIVE: The study was commissioned by the Welsh Office to pull together lessons from all reports on cases involving either a child abuse fatality or serious child protection concern ("Part 8 Reviews") since the introduction of the Children Act 1989. METHOD: Twenty-one such reports were identified and subjected to a content analysis to extract practice issues. RESULTS: From 19 reports (excluding Reviews concerning adult sexual abusers), the authors identify seven practice themes emerging from that analysis which are related to those identified in previous studies and to six previously undertaken British overviews of child abuse fatalities. The themes are assessment, interagency communications, responsibility, number of professionals involved, role of general practitioners, insufficient training for pediatricians/radiologists, and parental choice. CONCLUSIONS: British child protection agencies are attempting to address apparently conflicting policy objectives. On the one hand they are required to ensure the protection of the most vulnerable children within the child protection system. At the same time they are also being encouraged to adopt a "lighter touch" in child protection work. The authors conclude that the seven themes may provide some indicators as to how these conflicting objectives may be reconciled.  相似文献   

Joining the research conversation: threshold concepts embedded in the literature review     

Meeta Chatterjee-Padmanabhan  Wendy Nielsen  Sarah Sanders 《高等教育研究与发展》2019,38(3):494-507

  相似文献   

General population norms about child abuse and neglect and associations with childhood experiences     

Bensley L  Ruggles D  Simmons KW  Harris C  Williams K  Putvin T  Allen M 《Child abuse & neglect》2004,28(12):1321-1337

BACKGROUND: A variety of definitions of child abuse and neglect exist. However, little is known about norms in the general population as to what constitutes child abuse and neglect or how perceived norms may be related to personal experiences. METHODS: We conducted a random-digit-dialed telephone survey of 504 Washington State adults. Respondents were asked whether they believed each of 34 behaviors, identified in focus groups as possibly physically, sexually or emotionally abusive or neglectful, constituted abuse or neglect. Then, they were asked whether they had experienced 33 of the behaviors. RESULTS: Five of the six behaviors with the highest levels of consensus were for sexual abuse, whereas only one emotionally abusive behavior had a high level of consensus (95% agreement). Consensus that spanking constituted abuse increased with severity. Those respondents who reported experiencing a particular behavior were significantly less likely to believe the behavior abusive for 11 of the 33 behaviors and more likely to believe the behavior abusive for two of the behaviors. Where comparisons were possible, there was a high level of consensus that behaviors identified as abusive in Child Protective Service operational definitions constituted abuse. CONCLUSIONS: Self-reported childhood experiences were associated with perceived norms about child abuse. A better understanding of community norms about child abuse and neglect may be helpful in communicating with the public or allow for better targeting of educational messages through the media, parenting education classes, and so forth.  相似文献   

The classroom practices inventory: An observation instrument based on NAEYC's guidelines for developmentally appropriate practices for 4- and 5-year-old children     

Marion C. Hyson  Kathy Hirsh-Pasek  Leslie Rescorla 《Early childhood research quarterly》1990,5(4)

The controversy over what is an appropriate early childhood curriculum has created a need for research instruments designed to measure classroom practices. This article reports on the development of a new observational measure based on the Guidelines for Developmentally Appropriate Practices of the National Association for the Education of Young Children (NAEYC). The Classroom Practices Inventory (CPI) is a 26-item rating scale tapping the curricular emphasis and emotional climate of programs for 4- and 5-year-old children. The scale demonstrated a high degree of internal consistency. Over half the measure's variance was accounted for by a factor tapping encouragement of curiosity, creativity, and provision of concrete materials. In a study of 10 preschool programs, CPI scores correlated significantly with teachers' and parents' educational attitudes. Modest relationships were found between the CPI scores of children's preschools and measures of academic skills, creativity, and anxiety. The CPI appears to be a promising measure for critically examining the concept of developmentally appropriate practices in early childhood education.  相似文献   

VI. Is 12-Month-Old Word Learning Domain-General, Socially Determined, or Emergent?     

George Hollich  Kathy Hirsh-Pasek  & Roberta Michnick Golinkoff 《Monographs of the Society for Research in Child Development》2000,65(3):85-100

  相似文献