A three-season comparison of match performances among selected and unselected elite youth rugby league players     

Mark Waldron  Paul R. Worsfold  Craig Twist  Kevin Lamb 《Journal of sports sciences》2013,31(12):1110-1119

Abstract

This study compared technical actions, movements, heart rates and perceptual responses of selected and unselected youth rugby league players during matches (under-15 to under-17 age groups). The players’ movements and heart rates were assessed using 5 Hz Global Positioning Systems (GPSs), while their technical actions were analysed using video analysis. The maturity of each player was predicted before each season for statistical control. There were no differences (P > 0.05) between selected and unselected players in the under-15 or the under-17 age group for any variables. However, in the under-16 age group, the selected players (57.1 ± 11.9 min) played for longer than the unselected players (44.1 ± 12.3 min; P = 0.017; ES = 1.08 ± CI = 0.87), and covered more distance (5181.0 ± 1063.5 m cf. 3942.6 ± 1108.6 m, respectively; P = 0.012; ES = 1.14 ± CI = 0.88) and high-intensity distance (1808.8 ± 369.3 m cf. 1380.5 ± 367.7 m, respectively; P = 0.011; ES = 1.16 ± CI = 0.88). Although successful carries per minute was higher in the selected under-15 age group, there were no other differences (P > 0.05) in match performance relative to playing minutes between groups. Controlling for maturity, the less mature, unselected players from the under-16 age group performed more high-intensity running (P < 0.05). Our findings question the use of match-related measurements in differentiating between selected and unselected players, showing that later maturing players were unselected, even when performing greater high-intensity running during matches.  相似文献   

The Development of Critical Consciousness and its Relation to Academic Achievement in Adolescents of Color     

Scott Seider  Shelby Clark  Daren Graves 《Child development》2020,91(2):e451-e474

Critical consciousness, the process by which individuals come to understand, analyze, and take action against systems of oppression, is associated with several positive youth outcomes. However, little research has considered how the core components of critical consciousness (critical reflection, political agency, critical action) are associated with academic achievement. The present study explored the extent to which the developing critical consciousness of adolescents of color (N = 364) over 4 years of high school predicted academic achievement, as measured by grade point average (GPA) and the Scholastic Aptitude Test (SAT). Results demonstrated that adolescents’ critical reflection and critical action intercepts predicted SAT scores whereas critical reflection and critical action slopes predicted GPAs. Political agency was not predictive of either academic outcome.  相似文献   

Repeater Analysis for Combining Information From Different Assessments          下载免费PDF全文

Shelby Haberman  Lili Yao 《Journal of Educational Measurement》2015,52(2):223-251

Admission decisions frequently rely on multiple assessments. As a consequence, it is important to explore rational approaches to combine the information from different educational tests. For example, U.S. graduate schools usually receive both TOEFL iBT^® scores and GRE^® General scores of foreign applicants for admission; however, little guidance has been given to combine information from these two assessments, even though the relationships between such sections as GRE Verbal and TOEFL iBT Reading are obvious. In this study, principles are provided to explore the extent to which different assessments complement one another and are distinguishable. Augmentation approaches developed for individual tests are applied to provide an accurate evaluation of combined assessments. Because augmentation methods require estimates of measurement error and internal reliability data are unavailable, required estimates of measurement error are obtained from repeaters, examinees who took the same test more than once. Because repeaters are not representative of all examinees in typical assessments, minimum discriminant information adjustment techniques are applied to the available sample of repeaters to treat the effect of selection bias. To illustrate methodology, combining information from TOEFL iBT scores and GRE General scores is examined. Analysis suggests that information from the GRE General and TOEFL iBT assessments is complementary but not redundant, indicating that the two tests measure related but somewhat different constructs. The proposed methodology can be readily applied to other situations where multiple assessments are needed.  相似文献   

The effects of an intermediary placement on learning disabled and low-achieving adolescents     

K A Waldron 《Journal of learning disabilities》1985,18(3):154-159

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Hearing impaired students in regular classrooms: a cognitive model for educational services     

M B Waldron  T J Diebold  S Rose 《Exceptional children》1985,52(1):39-43

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Prior workload has moderate effects on high-intensity match performance in elite-level professional football players when controlling for situational and contextual variables     

Matthew Springham  Sean Williams  Mark Waldron  Anthony J. Strudwick  Chris Mclellan  Robert U. Newton 《Journal of sports sciences》2020,38(20):2279-2290

ABSTRACT

This investigation examined the effect of prior workload on high-intensity football match performance. Player load variables were recorded using a global positioning system and converted into composite variables: rolling season accumulated load (AL), exponentially weighted moving average acute, chronic and acute:chronic workload ratio (A:C). Match-play high-intensity performance-per-minute: accelerations (ACC), sprints, high-speed running (HSR) and high metabolic load (HMLd) distances; and situational and contextual variables were recorded for all games. Partial least squares modelling, and backward stepwise selection determined the most parsimonious model for each performance variable. Quadratic relationships of small to moderate effect sizes were identified for sprint AL and sprint performance, HSR AL and HSR performance, acute HMLd and HMLd performance, acute sprint load and ACC performance and A:C sprint load and ACC performance. Match performance was typically greatest between the mean and +1SD. High chronic HMLd, and combined acceleration and deceleration (ACC+DEC) load exerted small beneficial effects on HMLd and HSR performance, whereas high acute load exerted trivial to moderate negative effects. High sprint A:C exerted a small beneficial effect on sprint performance and playing position exerted small effects on HSR and HMLd performance. Prior workload has trivial to moderate effects on high-intensity match performance in professional players.  相似文献   

Discourses of forgiveness and resilience in stepchild–stepparent relationships     

Vincent R. Waldron  Dawn O. Braithwaite  Bailey M. Oliver  Dayna N. Kloeber  Jaclyn Marsh 《Journal of Applied Communication Research》2013,41(5):561-582

Challenges and conflicts experienced by stepfamilies are well documented, but researchers are increasingly focused on communication processes that facilitate resilience in these relationships. In other contexts, communicating forgiveness has been linked to relational healing after transgressions or adversity. In the current study, the researchers sought to understand how stepchildren talk about the role of forgiveness in the development of positive adult stepchild–stepparent relationships. Data were drawn from interviews with adult stepchildren who have a positive relationship with a stepparent. Following an interpretive analysis, the researchers identified five themes representing the ways forgiveness was conceptualized and enacted in these positive stepchild–stepparent relationships: forgiveness as (a) healing family connections, (b) explicit negotiation, (c) maturation and acceptance, (d) a response to vulnerability and compassion, and (e) evidence of relational growth. Theoretical and practical applications for understanding and fostering resilient stepfamilies and the role of forgiveness are discussed.  相似文献   

The Role of Subjective Threat in Upward Influence Situations     

Vincent R. Waldron  James Sanderson 《Communication quarterly》2013,61(2):239-254

The practice of organizational democracy requires members to exert influence. However, members often “pass” on the opportunity to exercise upward influence because they perceive the act to be threatening to them or to their supervisors. Drawing from Porter's early political theory of upward influence (Porter, Allen, &; Angle, 1981 Porter , L. W. , Allen , R. W. , &; Angle , H. L. ( 1981 ). The politics of upward influence in organizations . In L. L. Cummings &; B. Staw (Eds.), Research in organizational behavior (pp. 269 – 293 ). Greenwich , CT : JAI . [Google Scholar]), this study examined the role of relationship maintenance behavior and relationship quality in shaping threat perceptions in 2 different influence contexts. A survey of 319 working adults revealed that established patterns of relationship maintenance behavior predisposed employees to view situations involving upward influence to be more or less threatening. The current quality of the leader–member relationship was an even more substantive predictor. However, context moderated the relational effects. Relationship variables accounted for more variance in perceived threat when the influence was intended to advance legitimate (organizational), rather than illegitimate (personal), objectives. It is suggested that a “threat management” model of communication could guide future research on upward influence and similarly risky forms of workplace communication.  相似文献   

Towards a threat management model of upward communication: A study of influence and maintenance tactics in the leader‐member dyad     

Vincent R. Waldron  Marilyn D. Hunt  Margaret Dsilva 《Communication Studies》2013,64(3-4):254-272

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The relationship between physical abilities,ball-carrying and tackling among elite youth rugby league players     

Mark Waldron  Paul Ray Worsfold  Craig Twist  Kevin Lamb 《Journal of sports sciences》2013,31(6):542-549

Abstract

This study investigated the relationship between the physical abilities of adolescent rugby league players and tackling and ball-carrying skills performed during matches, across three seasons (under-15 to under-17). The players were measured each season for acceleration (10–30 m), peak and mean speed (10–30 m), sprinting force (10–30 m), aerobic power, counter-movement jump (CMJ) height and jumping power. The matches were filmed and analysed for ball-carrying and tackling frequency per minute (successful and unsuccessful outcomes). There were strong relationships between successful carries?min^–1 and 10 m force in the under-15 (R = 0.61, P < 0.001), under-16 (R = 0.69, P < 0.001) and under-17 groups (R = 0.64, P < 0.001). There were also strong and moderate relationships between predicted vertical power and successful carries?min^–1 in the under-15 (R = 0.63, P = 0.011) and under-17 group (R = 0.40, P = 0.030), respectively. There were no relationships between carries or tackles and any other performance indicators. These findings suggest that acceleration, in accordance with gains in body mass, support ball-carrying but not tackling performance. Performance measurements, such as CMJ or aerobic power, do not support ball-carrying ability among youth rugby league players.  相似文献