Adjusting athletes' body mass index to better reflect adiposity in epidemiological research     

Alan M. Nevill  Edward M. Winter  Steve Ingham  Adam Watts  Georgios S. Metsios  Arthur D. Stewart 《Journal of sports sciences》2013,31(9):1009-1016

Abstract

The aim of the present study was to identify when body mass index (BMI) is unlikely to be a valid measure of adiposity in athletic populations and to propose a simple adjustment that will allow the BMI of athletes to reflect the adiposity normally associated with non-athletic populations. Using data from three previously published studies containing 236 athletes from seven sports and 293 age-matched controls, the association between adiposity (sum of 4 skinfold thicknesses, in millimetres) and BMI was explored using correlation, linear regression, and analysis of covariance (ANCOVA). As anticipated, there were strong positive correlations (r = 0.83 for both men and women) and slope parameters between adiposity and BMI in age-matched controls from Study 1 (all P < 0.001). The standard of sport participation reduced these associations. Of the correlations and linear-regression slope parameters between adiposity and BMI in the sports from Studies 2 and 3, although still positive in most groups, less than half of the correlations and slope parameters were statistically significant. When data from the three studies were combined, the ANCOVA identified that the BMI slope parameter of controls (5.81 mm · (kg · m^?2)^?1) was greater than the BMI slope parameter for sports (2.62 mm · (kg · m^?2)^?1) and middle-distance runners (0.94 mm · (kg · m^?2)^?1) (P < 0.001). Based on these contrasting associations, we calculated how the BMI of athletes can be adjusted to reflect the same adiposity associated with age-matched controls. This simple adjustment allows the BMI of athletes and non-athletes to be used with greater confidence when investigating the effect of BMI as a risk factor in epidemiological research.  相似文献   

Responses to Forces Influencing Cohesion As a Function of Player Status and Level of Male Varsity Basketball Competition     

Joseph J. Gruber  Gary R. Gray 《Research quarterly for exercise and sport》2013,84(1):27-36

Abstract

This exploratory study determined if the responses of male varsity basketball players to six factors influencing cohesion were a function of level of competitive intensity and/or the importance of the players to their team. Players on intact teams from five levels of competition – elementary school, junior high school, senior high school, small college and large college–responded to a cohesion questionnaire at the end of the season. Coaches designated five players with the most game playing time as “starters” and five players with the least game playing time as “reserves.” A team factor score for Team Performance Satisfaction, Self Performance Satisfaction, Task Cohesion, Affiliation Cohesion, Desire for Recognition and Value of Membership was calculated. Each team factor score served as the dependent variable in a 2 (player status) × 5 (level of competition) analysis ofcovariance design, with teams nested in the second factor. The won-loss record served as the covariate. Results indicated that “starters” were more satisfied with their own performance, were more task conscious, had a greater affiliation desire, and valued their membership on the team to a greater degree than the “reserves.” The elementary and junior high school team members were significantly more satisfied with the team's performance, were more satisfied with their own self performance, were more affiliation conscious, and valued their team membership to a greater degree than did college team members. The interaction between player status and level of competition was not significant for any of the factor scores.  相似文献   

Determination of the swing technique characteristics and performance outcome relationship in golf driving for low handicap female golfers     

Susan J. Brown  Alan M. Nevill  Stuart A. Monk  Steve R. Otto  W. Scott Selbie  Eric S. Wallace 《Journal of sports sciences》2013,31(14):1483-1491

Abstract

Previous studies on the kinematics of the golf swing have mainly focused on group analysis of male golfers of a wide ability range. In the present study, we investigated gross body kinematics using a novel method of analysis for golf research for a group of low handicap female golfers to provide an understanding of their swing mechanics in relation to performance. Data were collected for the drive swings of 16 golfers using a 12-camera three-dimensional motion capture system and a stereoscopic launch monitor. Analysis of covariance identified three covariates (increased pelvis–thorax differential at the top of the backswing, increased pelvis translation during the backswing, and a decrease in absolute backswing time) as determinants of the variance in clubhead speed (adjusted r ² = 0.965, P < 0.05). A significant correlation was found between left-hand grip strength and clubhead speed (r = 0.54, P < 0.05) and between handicap and clubhead speed (r = ?0.612, P < 0.05). Flexibility measures showed some correlation with clubhead speed; both sitting flexibility tests gave positive correlations (clockwise: r = 0.522, P < 0.05; counterclockwise: r = 0.711, P < 0.01). The results suggest that there is no common driver swing technique for optimal performance in low handicap female golfers, and therefore consideration should be given to individual swing characteristics in future studies.  相似文献   

Multimedia transforms union Pacific’s training strategy     

Steve Cantwell 《TechTrends》1993,38(6):21-22

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Exploring the relationship between school discipline referrals and delinquency     

Jeffery Sprague  Hill M. Walker  Steve Stieber  Brandi Simonsen  Vicki Nishioka  Linda Wagner 《Psychology in the schools》2001,38(2):197-206

There is a growing concern about violent and destructive behaviors of youth that require intervention by juvenile justice and youth‐serving agencies. This concern has led many to conclude that schools and community agencies must increase efforts to prevent juvenile delinquency and to provide programs that will facilitate rehabilitation, education, and vocational training for youth already involved. A clear understanding of the nature and range of behaviors that result in juvenile crime is needed in order to develop programs and interventions that can be expected to lead to beneficial changes for youth and for society as a whole. The purpose of this article is to describe the relationship between school behaviors and youth characteristics in school (e.g., discipline referrals, teacher nominations, nomothetic ratings) and referrals to juvenile authorities (e.g., illegal behaviors). We describe a strategy of using teacher nominations, school discipline referrals, and community arrest data to predict delinquent and violent behavior in youth. We outline data from a group of socially maladjusted middle school youth to illustrate the relationship between the two data sources and recommendations for identification and treatment of youth at risk for delinquency and antisocial behavior. © 2001 John Wiley & Sons, Inc.  相似文献   

The structural relationship between writing attitude and writing achievement in first and third grade students     

Steve Graham  Virginia Berninger  Weihua Fan 《Contemporary educational psychology》2007

This study tested three models of the structural relationship between the writing achievement of primary grade students and their attitude towards writing (defined here as an affective disposition involving how the act of writing makes the author feel, ranging from happy to unhappy). The three models tested were: (a) writing attitude influences writing achievement in a unidirectional manner, (b) writing achievement influences writing attitude in a unidirectional manner, and (c) the effects of writing attitude and achievement are bidirectional and reciprocal. The model that best fit the data was based on the assumption that writing attitude influences writing achievement. In addition, the direct path between attitude and achievement in this model was statistically significant. Although third grade students were better writers than first grade students, there was no statistical difference in younger and older students’ attitude towards writing. In addition, girls were more positive about writing than boys, but there was no statistical difference in their writing achievement related to gender. This research extends models based on the cognitive and language processes of writing to include the role of attitude, which is an affective component of motivation.  相似文献   

Lower-Division Class size at U.S. Postsecondary Institutions     

Chatman  Steve 《Research in higher education》1997,38(5):615-630

The 1992—93 National Survey of Postsecondary Faculty (NSOPF) provides a unique opportunity to examine class size and the institutional and academic factors associated with class size differences. The institutional characteristics examined in this paper include public or private control, Carnegie classification, and institutional size. The course academic characteristics considered include academic discipline as described by Biglan (1973a), student level, and principal method of instruction. The results support the formation of comparative distributions for class size comparison and better understanding of institutional and course characteristics associated with class size differences.  相似文献   

Youth rising? The politics of youth in the global economy     

Laura Harvey  Steve Roberts  Jo-Anne Dillabough 《British Journal of Sociology of Education》2016,37(3):465-480

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Imagining and Moving Beyond the ESL Bubble: Facilitating Communities of Practice Through the ELL Ambassadors Program     

Steve Daniel Przymus 《Journal of Language, Identity & Education》2016,15(5):265-279

When educators do not facilitate English language learners’ (ELLs) social integration in schools, this can perpetuate ELLs’ marginalized status and the plateauing of ELLs’ English language development. This study highlights a program for secondary ELLs called the ELL Ambassadors program, which partnered ELLs with non-ELLs based on shared extracurricular interests. Comparing the stories, perspectives, and test scores of five newcomer ELLs from varied countries of origin, this article shows how program participants strengthened their English language skills and achieved academic success, demonstrating tremendous agency as they gained access to, and were socialized within, interest-based communities of practice. Further, this article documents how youth imagined and claimed new identities, moving beyond the insulation and isolation of the ESL bubble to gaining confidence through interest-based learning with other peers. Findings suggest that interest-based peer programs at schools may create important opportunities for ELLs’ academic, language, and identity formation.  相似文献   

e‐Learning in universities: Supporting help‐seeking processes by instructional prompts     

Silke Schworm  Hans Gruber 《British journal of educational technology : journal of the Council for Educational Technology》2012,43(2):272-281

University students are more responsible than school students for their own learning. The role of self‐regulated learning increases in virtual e‐learning course environments. Academic help‐seeking is an important strategy of self‐regulated learning, but many students fail to use this strategy appropriately. A lack of information and a perceived threat of help‐seeking may cause this effect. Among others, giving prompts is an instructional means to support students to adequately apply academic help‐seeking . A study is presented in which the effect of giving prompts on the quantity and quality of academic help‐seeking was experimentally investigated in a blended university learning course of educational science. Compared with students who received no prompts, students with prompts about the relevance of active help‐seeking had better learning outcomes, participated more actively in online learning activities, more explicitly referred to learning contents in the forums and took more initiative in starting discussions. The perceived threat of help‐seeking could not be reduced, however.  相似文献