Multi-age-grouping paradigm for young swimmers

Abstract

The purpose of this study was to examine the adequacy of “multi-age” classification systems in youth sports with a specific focus on the unisex multi-age-groupings used by USA Swimming. In addition, we offer an analytical rationale for the multi-age-groupings and potential alternatives. We examined the top 100 US swim performances for three years (2005, 2006, and 2007) for girls and boys in 15 age-groups (7 to 20 years and a singular group of 21 years and older). Data for each age and sex were pooled over the three years and means were calculated for each of seven competitive swim events. Swim times differed among each age up to the 14-year age-group in girls (F _14,30885 = 183.9, P < 0.01, Cohen's d = 1.19–3.72, large effect) and 16-year age-group in boys (F _14,30885 = 308.7, P < 0.01, Cohen's d = 0.81–3.64, large effect) for all events. Age-related differences in swim times continued later in boys than girls likely due to differences between the sexes in timing of growth and maturation. Because of the differences in swim performance in contemporary multi-age-groups, stratifying swimmers by a single age is the best means to ensure competitive fairness and equality, although there is no rationale for swimmers under the age of 8 years to compete in separate unisex competitive groups.     

Testing a student generated hypothesis using student data

We describe an activity that allows students to experience the full process of a statistical investigation, from generating the research question, to collecting data and testing a hypothesis. Implementation of the activity is described both with and without use of clickers, handheld remotes that allow instant data collection.     

Excluding students from classroom: Teacher techniques that promote student responsibility

Students who continuously misbehave are frequently excluded from class, allowing them time to reflect on their inappropriate behavior. This paper examines students’ perceptions of the teacher’s behavior toward them prior to, during, and after the exclusion, focusing on teachers’ explanations, punishments, and follow-up conversations. The results indicate that students who do not accept responsibility for being excluded think that their teachers’ are to blame. To convince students to accept responsibility for their acts, teachers must explain why the exclusion is necessary, warn and punish before excluding a student, and hold a follow-up conversation, highlighting the impact of the misbehavior on classmates.     

Examination of Middle-School Students' Independent Use of a Complex Mnemonic System

The purpose of the present 2-experiment study was to determine whether a recently developed mnemonic numeric strategy could be used more independently by middle school students. In the context of associating various 18th-, 19th-, and 20th-century inventions with their dates, the authors found that students could successfully implement the strategy in a group-instructional context (as opposed to the one-on-one individual administrations of earlier investigations). The students were not, however, able to take the basic components of the strategy and effectively apply them without complete mnemonic pictorial support. That is, students did not create their own memory-enhancing visual images in the absence of instructor-provided interactive line drawings. The results are consistent with those of previous research documenting that less sophisticated learners (including middle school students) are unable to apply complex mnemonic strategies independently unless they are provided with sufficient auxiliary support to reduce information-processing demands.     

On pictures in prose

For some time now, researchers and educators have questioned the value of pictures for prose-learning. However, there is abundant empirical evidence to document the positive value of pictures. Consistent learning gains are associated with the use of pictures when experiments adhere to these five ground rules: (1) prose passages are presented orally; (2) the subjects are children; (3) the passages are fictional narratives; (4) the pictures overlap the story content; and (5) learning is demonstrated by factual recall. Both centers are supported in part by funds from the National Institute of Education. The opinions herein do not necessarily reflect the postion or policy of the National Institute of Education and no official endorsement by the National Institute of Education should be inferred. The authors are grateful to Michael Pressley and Sharon Stevens for their comments on an earlier draft of the paper.     

School support groups,other school factors,and the safety of sexual minority adolescents

Sexual minority adolescents—those self‐identifying as lesbian, gay, or bisexual (LGB) or with same‐sex desires or sexual experiences—report higher rates of victimization and suicidality than their heterosexual peers, yet little empirical research has examined school factors associated with these risks. This study used data from the Massachusetts Youth Risk Behavior Survey (Massachusetts Department of Education, 2000), matched with school‐level data from state records and school principals, to compare the safety of 202 sexual minority adolescents in 52 schools with and without support groups for LGB students, to investigate the relationship between perceived staff support and safety, and to explore other school factors associated with victimization and suicidality among these youth. As hypothesized, sexual minority adolescents in schools with LGB support groups reported lower rates of victimization and suicide attempts than those in other schools. Victimization and perceived staff support predicted suicidality. Several additional school factors were associated with the safety of sexual minority students. © 2006 Wiley Periodicals, Inc. Psychol Schs 43: 573–589, 2006.     

Longer-term effects of minimalist shoes on running performance,strength and bone density: A 20-week follow-up study*

This study investigated whether male runners improve running performance, running economy, ankle plantar flexor strength, and alter running biomechanics and lower limb bone mineral density when gradually transitioning to using minimalist shoes for 100% of weekly running. The study was a planned follow-up of runners (n?=?50) who transitioned to minimalist or conventional shoes for 35% of weekly structured training in a previous 6-week randomised controlled trial. In that trial, running performance and economy improved more with minimalist shoes than conventional shoes. Runners in each group were instructed to continue running in their allocated shoe during their own preferred training programme for a further 20 weeks while increasing allocated shoe use to 100% of weekly training. At the 20-week follow-up, minimalist shoes did not affect performance (effect size: 0.19; p?=?0.218), running economy (effect size: ≤?0.24; p?≥?0.388), stride rate or length (effect size: ≤?0.12; p?≥?0.550), foot strike (effect size: ≤?0.25; p?≥?0.366), or bone mineral density (effect size: ≤?0.40; p?≥?0.319). Minimalist shoes increased plantar flexor strength more than conventional shoes when runners trained with greater mean weekly training distances (shoe*distance interaction: p?=?0.036). After greater improvements with minimalist shoes during the initial six weeks of a structured training programme, increasing minimalist shoe use from 35% to 100% over 20 weeks, when runners use their own preferred training programme, did not further improve performance, running economy or alter running biomechanics and lower limb bone mineral density. Minimalist shoes improved plantar flexor strength more than conventional shoes in runners with greater weekly training distances.