Early Years Parenting Mediates Early Adversity Effects on Problem Behaviors in Intellectual Disability     

Vasiliki Totsika  Richard P. Hastings  Eric Emerson  Chris Hatton 《Child development》2020,91(3):e649-e664

A family developmental framework was applied to data from families of children with intellectual disabilities to understand the role of parenting in the path from early adversity to problem behaviors in mid-childhood. Data from 9 months to 11 years tested the Family Stress Model in families of 555 children. Adversarial parenting between 3 and 5 years mediated the path from early adversity (family poverty and maternal psychological distress at nine months) to problem behaviors at 7 and 11 years. Positive parent–child relationship only mediated the path to conduct problems. Multiple mediation was not present. Early adversity impacts both positive parent–child relationship and adversarial parenting between three and five, but the latter is crucial for problem behaviors in mid-childhood.  相似文献   

Power training in elite young soccer players: Effects of using loads above or below the optimum power zone     

Irineu Loturco  Lucas A. Pereira  Valter P. Reis  Chris Bishop  Vinicius Zanetti  Pedro E. Alcaraz 《Journal of sports sciences》2020,38(11-12):1416-1422

ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.  相似文献   

Feasibility for the Use of a Standardized Fitness Testing Protocol Among Australian Fitness Industry Professionals     

Jason A. Bennie  Glen H. Wiesner  Ineke Vergeer  Tracy L. Kolbe-Alexander  Katrien De Cocker  Chris Alexander 《Research quarterly for exercise and sport》2018,89(3):380-385

Purpose: There is currently no standardized testing protocol for assessing clients’ fitness/health within the Australian fitness industry. This study examined the perceptions of the feasibility of using a standardized testing protocol among Australian fitness industry professionals. Method: In 2014, 1,206 registered fitness industry professionals (aged 17–69 years) completed an online survey. Perceived feasibility for using a standardized testing protocol was assessed based on responses to 6 items. Respondents were classified as having a high level of perceived feasibility if they reported all 6 items to be “definitely feasible.” A multivariate logistic regression analysis, adjusting for demographic and fitness industry-related factors (e.g., qualification/years of experience), assessed the likelihood of having a high level of perceived feasibility. Results: Overall, 25.5% (95% CI [23.1%, 28.0%]) of the sample perceived the use of a standardized testing protocol as highly feasible. Items ranked most often as “definitely feasible” were “undertaking training to use the protocol” (55%) and “conducting follow-up testing every 6 to 12 weeks” (52%). After adjustment for the effect of confounding factors, casually employed professionals (OR = 0.63; 95% CI [0.45, 0.90]) and group instructors (OR = 0.58; 95% CI [0.41, 0.82]) were less likely to perceive standardized testing protocols as highly feasible. Conclusions: Among a large sample of Australian fitness industry professionals, slightly more than a quarter perceived using a standardized testing protocol to be highly feasible. Group instructors and casual employees perceived lower feasibility. Further research should determine the barriers to implementing a standardized testing protocol across the fitness industry.  相似文献   

The importance and development of ball control and (self-reported) self-regulatory skills in basketball players for different positions     

Sanne Cornelia Maria te Wierike  Barbara Catharina Helena Huijgen  Laura Jonker  Chris Visscher 《Journal of sports sciences》2018,36(6):710-716

This study first investigated the importance of ball control and (self-reported) self-regulatory skills in achieving the elite level in basketball. The second aim was to gain insight into the development of, and association between ball control and (self-reported) self-regulatory skills that contribute to achieving the elite level, with taking into account positional differences. Talented male players (N = 73; age 16.56 ± 1.96) completed the STARtest to measure ball control and a questionnaire to measure (self-reported) self-regulation from 2008–2012. Results showed that (self-reported) reflective skills were most important to achieve the elite level (OR = 11.76; P < 0.05). There was no significant improvement in (self-reported) reflection over time for guards, forwards, and centers. Improvement in ball control was evident for guards (r = ?0.65; P < 0.05). Furthermore, guards and forwards had better ball control compared to centers (P < 0.01). For those two positions, negative correlations were found between (self-reported) reflection and ball control, i.e., higher reflection was related to better ball control (guards r = ?0.19; forwards r = ?0.18) in contrast to centers (r = 0.34). It is concluded that (self-reported) reflective skills are important to achieve the elite level, while ball control seems especially important for guards.  相似文献   

Psychological support for sport coaches: an exploration of practitioner psychologist perspectives     

Sarah Kelly  Richard Thelwell  Jamie B. Barker  Chris G. Harwood 《Journal of sports sciences》2018,36(16):1852-1859

In the present study we add to the literature by exploring the degree to which UK practitioner psychologists perceive themselves able to support sport coaches, and how professional training prepares psychologists for coach work across performance domains. Ten participants comprising seven sport and exercise psychologists with Health Care Professions Council (HCPC) practitioner psychologist status and three trainee psychologists studying towards the British Psychological Society (BPS) qualification in sport and exercise psychology (QSEP) were individually interviewed. All participants reported prior experience of working with coaches across all performance domains. We explored: practitioner’s understanding of the challenges coaches face within their job; practitioner’s experiences of coach work; perspectives about the ways in which practitioners could and should support coaches; and, the degree to which professional training prepares practitioners for coach work. Using recommended procedures of Connelly and Peltzer, content analysis revealed practitioners perceived the challenges faced by coaches are different at grassroots level compared to those working with elite athletes, and that practitioners require skills to provide one-to-one coach support and group-based interventions. All practitioners perceived that training programmes do not adequately equip trainees with skills required for coach work. We discuss the implications for enhancing practitioner training in the UK.  相似文献   

Exploring a taboo of cultural reproduction     

Chris Holligan 《British Journal of Sociology of Education》2018,39(4):535-550

Cultural reproduction is rarely, if ever, theorised through clandestine practices of sexual offending by teachers in the gendered hierarchies of state schools. Drawing upon Freedom of Information requests and other official qualitative data provided by a U.K. teaching council, this article endeavours to explain the form of a gendered cultural reproduction by reference to the diversity of ways in which identities are constructed and ‘contracted’ for female student victims. The article begins by looking at this taboo subject matter in the context of a historical patriarchal order and cultures of heterosexuality in schools, followed by a feminist perspective through which empirical theorisation is documented. Michel Foucault’s work on the micro-physics of power and normativity informs the emphasis of the contemporary feminist prism. It is argued that this offending occurs under the auspices of the professional teacher–student hierarchy and produces distinctive and damaging power effects.  相似文献   

Hot hands,cold feet? Investigating effects of interacting constraints on place kicking performance at the 2015 Rugby Union World Cup     

Chris Pocock  Neil E. Bezodis  Keith Davids  Jamie S. North 《European Journal of Sport Science》2018,18(10):1309-1316

Place kicks in Rugby Union present valuable opportunities to score points outside the spatiotemporal dynamics of open play but are executed under varying performance constraints. We analysed effects of specific task constraints and relevant contextual factors on place kick performance in the 2015 Rugby Union World Cup. Data were collected from television broadcasts for each place kick. In addition to kick outcomes, contextual factors, including time of the kick in the match, score margin at the time of the kick, and outcome of the kicker’s previous kick, were recorded. Effects of spatial task constraints were analysed for each kick, using distance (m) and angle (°) of the kick to the goalposts. A binomial logistic regression model revealed that distance from, and angle to, the goalposts were significant predictors of place kick outcome. Furthermore, the success percentage of kickers who missed their previous kick was 7% lower than those who scored their previous kick. Place kick success percentage in the 10 minutes before half-time was 8% lower than the mean tournament success percentage, which was 75% (95% CI 71–78%). The highest kick success percentage was recorded when scores were level (83%; 95% CI 72–91%). Our data highlighted how subtle changes in task constraints and contextual factors can influence performance outcomes in elite performers in international competition. Fluctuations in place kick success suggested that individual constraints, such as thoughts, emotions and fatigue, induced during competition, could interact with perceptions to influence emergent performance behaviours.  相似文献   

Bodies in flux: scientific methods for negotiating medical uncertainty,C. Teston. Chicago,IL: University of Chicago Press, 2017, 243 pp., Paperback – $35/Hardcover – $105/E-Book – $35     

Chris McCracken 《Technical Communication Quarterly》2018,27(2):191-194

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Estimating the Relationship between Corporal Punishment Use and School Suspensions: Longitudinal Evidence from the Civil Rights Data Collection     

F. Chris Curran  James Kitchin 《Peabody Journal of Education》2018,93(2):139-160

Corporal punishment use in schools has decreased significantly over the past several decades; however, little research has explored the implications of such reductions in corporal punishment use. Theoretically, reducing or banning the use of corporal punishment could alter student and teacher behavior, resulting in changes in rates of other forms of discipline, such as suspension. Using nationally representative, longitudinal data from the Civil Rights Data Collection, this study estimates the relationship between corporal punishment use and suspension rates. Results from a series of fixed effects regression models suggest that reduced use or elimination of corporal punishment predicts lower rates of suspension overall but may predict higher rates of suspension in school districts serving larger proportions of racial minority students. Implications of these findings for current policy discussions around corporal punishment bans and for racial equity in school discipline are discussed.  相似文献   

Validation of a videogrammetry technique for analysing American football helmet kinematics     

Ann Bailey  James Funk  David Lessley  Chris Sherwood  Jeff Crandall  William Neale 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(5):678-700

ABSTRACT

Professional American football games are recorded in digital video with multiple cameras, often at high resolution and high frame rates. The purpose of this study was to evaluate the accuracy of a videogrammetry technique to calculate translational and rotational helmet velocity before, during and after a helmet impact. In total, 10 football impacts were staged in a National Football League (NFL) stadium by propelling helmeted 50th percentile male crash test dummies into each other or the ground at speeds and orientations representative of concussive impacts for NFL players. The tests were recorded by experienced sports film crews to obtain video coverage and quality typically available for NFL games. A videogrammetry procedure was used to track the position and rotation of the helmet throughout the relevant time interval of the head impact. Compared with rigidly mounted retroreflective marker three dimensional (3-D) motion tracking that was concurrently collected in the experiments, videogrammetry accurately calculated changes in translational and rotational velocity of the helmet using high frame rate (two cameras at 240 Hz) video (7% and 15% error, respectively). Low frame rate (2 cameras at 60 Hz) video was adequate for calculating pre-impact translational velocity but not for calculating the translational or rotational velocity change of the helmet during impact.  相似文献