A Longitudinal Study of Forms and Functions of Aggressive Behavior in Early Childhood     

Dianna Murray-Close  Jamie M. Ostrov 《Child development》2009,80(3):828-842

The purpose of this study was to investigate the distinct forms (i.e., physical and relational) and functions (i.e., proactive and reactive) of aggressive behavior during early childhood ( n  =   101; M age = 45.09 months). Forms, but not functions, of aggressive behavior were stable over time. A number of contributors to aggression were associated with distinct subtypes of aggressive behavior. Females and socially dominant children were more relationally aggressive and older children were less physically aggressive than their peers. Longitudinal analyses indicated that social dominance predicted decreases in physical aggression and peer exclusion predicted increases in relational aggression. Overall, the results provide support for the distinction between subtypes of aggression in early childhood.  相似文献   

Differences in step characteristics and linear kinematics between rugby players and sprinters during initial sprint acceleration     

James J. Wild  Ian N. Bezodis  Jamie S. North  Neil E. Bezodis 《European Journal of Sport Science》2018,18(10):1327-1337

The initial steps of a sprint are important in team sports, such as rugby, where there is an inherent requirement to maximally accelerate over short distances. Current understanding of sprint acceleration technique is primarily based on data from track and field sprinters, although whether this information is transferable to athletes such as rugby players is unclear, due to differing ecological constraints. Sagittal plane video data were collected (240?Hz) and manually digitised to calculate the kinematics of professional rugby forwards (n?=?15) and backs (n?=?15), and sprinters (n?=?18; 100?m personal best range?=?9.96–11.33?s) during the first three steps of three maximal sprint accelerations. Using a between-group research design, differences between groups were determined using magnitude-based inferences, and within-group relationships between technique variables and initial sprint acceleration performance were established using correlation. Substantial between-group differences were observed in multiple variables. Only one variable, toe-off distance, differed between groups (d?=??0.42 to ?2.62) and also demonstrated meaningful relationships with sprint performance within all three groups (r?=??0.44 to ?0.58), whereby a stance foot position more posterior relative to the centre of mass at toe-off was associated with better sprint performance. While toe-off distance appears to be an important technical feature for sprint acceleration performance in both sprinters and rugby players, caution should be applied to the direct transfer of other kinematic information from sprinters to inform the technical development of acceleration in team sports athletes.  相似文献   

Altitude training in endurance running: perceptions of elite athletes and support staff     

Gareth Turner  Barry W Fudge  Jamie S M Pringle  Neil S Maxwell  Alan J Richardson 《Journal of sports sciences》2019,37(2):163-172

This study sought to establish perceptions of elite endurance athletes on the role and worth of altitude training. Elite British endurance runners were surveyed to identify the altitude and hypoxic training methods utilised, along with reasons for use, and any situational, cultural and behaviour factors influencing these. Prior to the 2012 Olympics Games, 39 athletes and 20 support staff (coaches/practitioners) completed an internet-based survey to establish differences between current practices and the accepted “best-practice”. Almost all of the athletes (98%) and support staff (95%) surveyed had utilised altitude and hypoxic training, or had advised it to athletes. 75% of athletes believed altitude and hypoxia to be a “very important” factor in their training regime, with 50% of support staff believing the same. Athletes and support staff were in agreement of the methods of altitude training utilised (i.e. 'hypoxic dose’ and strategy), with camps lasting 3–4 weeks at 1,500–2,500 m being the most popular. Athletes and support staff are utilising altitude and hypoxic training methods in a manner agreeing with research-based suggestions. The survey identified a number of specific challenges and priorities, which could provide scope to optimise future altitude training methods for endurance performance in these elite groups.  相似文献   

Effects of cooperative versus individual learning and orienting activities during computer-based instruction     

Jamie C. Cavalier  James D. Klein 《Educational technology research and development : ETR & D》1998,46(1):5-17

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Examining the relationships between challenge and threat cognitive appraisals and coaching behaviours in football coaches     

Martin Dixon  Martin J. Turner  Jamie Gillman 《Journal of sports sciences》2017,35(24):2446-2452

Previous research demonstrates that sports coaching is a stressful activity. This article investigates coaches’ challenge and threat cognitive appraisals of stressful situations and their impact on coaching behaviour, using Blascovich and Mendes’ (2000) biopsychosocial model as a theoretical framework. A cross-sectional correlational design was utilised to examine the relationships between irrational beliefs (Shortened general attitude and belief scale), challenge and threat appraisals (Appraisal of life events scale), and coaching behaviours (Leadership scale for sports) of 105 professional football academy coaches. Findings reveal significant positive associations between challenge appraisals and social support, and between threat appraisals and autocratic behaviour, and a significant negative association between threat appraisals and positive feedback. Results also show that higher irrational beliefs are associated with greater threat, and lesser challenge cognitive appraisals. However, no associations were revealed between irrational beliefs and challenge cognitive appraisals. Additionally, findings demonstrate a positive relationship between age and training and instruction. Results suggest that practitioners should help coaches to appraise stressful situations as a challenge to promote positive coaching behaviours.  相似文献   

Identifying the critical time period for information extraction when recognizing sequences of play     

North JS  Williams AM 《Research quarterly for exercise and sport》2008,79(2):268-273

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Stressors, coping, and coping effectiveness: gender, type of sport, and skill differences   总被引：1，自引：0，他引：1  

Nicholls AR  Polman R  Levy AR  Taylor J  Cobley S 《Journal of sports sciences》2007,25(13):1521-1530

The aim of this study was to examine stressors, coping, and coping effectiveness as a function of gender, type of sport, and skill. The sample consisted of 749 undergraduate athletes (455 males, 294 females) aged 18-38 years (mean= 19.8 years). Skill was classified as international/national, county, university, and club standard. Participants completed a stressor and coping concept map (Novak & Gowin, 1984). The results revealed gender, type of sport, and skill differences in relation to stressor frequencies, coping strategy deployment, and coping effectiveness. In contrast to previous research, females used a variety of problem-focused (e.g. planning, communication, technique-orientated coping) strategies more frequently than males. Team sport athletes reported a variety of sport-specific stressors relating to the demands of playing in a team environment. The group of national/international athletes reported using more planning, blocking, and visualization, and also reported that their coping was more effective than that of less-skilled athletes.  相似文献   

Erratum to: Bloss JE,LePrevost CE,Cofie LE,Lee JGL. Creating information resources and trainings for farmworker-serving community health workers. J Med Libr Assoc. 2022;110(1):113–118. DOI: https://doi.org/10.5195/jmla.2022.1272.     

Jamie E. Bloss 《Journal of the Medical Library Association》2022,110(1):E31

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Journal marketing in North America     

Jamie Cameron 《Learned Publishing》1993,6(2):23-27

Considers how, with the currently accelerating pace of change, publishers must adjust their attitudes and practices to stay in business and maximize the revenue from published journals; the particular difficulties of the North American market; and the nature of the economic, technological, behavioural and funding changes occurring.  相似文献   

A teacher's story,a teacher's reflections treasuring children     

Jamie Barron Jones 《Early Childhood Education Journal》1995,22(4):29-31

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