In-season changes in ventricular morphology and systolic function in adolescent female athletes     

Andrew M. Watson  Carol Coutinho  Kristin Haraldsdottir  Stacey Brickson  Warren Dunn  Marlowe Eldridge 《European Journal of Sport Science》2018,18(4):534-540

Purpose: To evaluate the influence of physical maturity on the changes in ventricular morphology and function with sport training in female youth athletes.

Methods: Thirty-two female athletes (age 13–18 years) underwent height and weight measurement and 2-D echocardiographic evaluation immediately prior to, and following, a 20-week soccer season. Pre- and post-season left ventricular end-diastolic diameter (LVEDD), end-diastolic volume (LVEDV), ejection fraction (LVEF), stroke volume (LVSV), mass (LVM), and posterior wall thickness (LVPWT), right ventricular end-diastolic diameter (RVEDD), end-diastolic area (RVEDA), and fractional area change (RVFAC), and interventricular septal thickness (IVST) were compared. In-season change in each variable was compared across pre-season hours of vigorous physical activity (0–1, 2–3, >3 hours).

Results: Significant increases were identified in LVEDV (51.3?±?10.4?v 56.4?±?9.6?ml/m², p?=?0.001) and RVEDA (10.5?±?1.9?v 11.3?±?2.5?cm²/m², p?=?0.040), but not LVEDD, LVM, LVPWT, LVSV, RVEDD, RVEDA, RVFAC, or IVST (p?>?0.05 for all). In-season changes in echocardiographic variables did not differ across hours of pre-season vigorous physical activity (p?>?0.05 for all).

Conclusion: Among female adolescent soccer players, in-season training elicits changes in resting ventricular volume, but not wall thickness or systolic function. These adaptations do not appear to be influenced by pre-season physical activity level.  相似文献   

Young children's near and far transfer of the basic theory of natural selection: An analogical storybook intervention          下载免费PDF全文

Natalie Emmons  Kristin Lees  Deborah Kelemen 《科学教学研究杂志》2018,55(3):321-347

Misconceptions about adaptation by natural selection are widespread among adults and likely stem, in part, from cognitive biases and intuitive theories observable in early childhood. Current educational guidelines that recommend delaying comprehensive instruction on the topic of adaptation until adolescence, therefore, raise concerns because children's scientifically inaccurate theories about species may be left unchallenged for many years, allowing them to entrench and become difficult to overcome. In consequence, this investigation sought to explore whether classrooms of kindergartners and second graders could acquire a basic but comprehensive understanding of adaptation from an intervention constructed around two picture storybooks that mechanistically explain natural selection. Learning was assessed in near and far transfer contexts both immediately and a month later. Kindergartners and second graders demonstrated substantial learning of biological information; however, second graders showed pronounced abilities to near and far generalize, immediately and over time. Results suggest that causally cohesive interventions with an emphasis on mechanistic explanation facilitate children's classroom learning of complex counterintuitive scientific ideas.  相似文献   

Protective Factors as Predictors of Suicide Risk Among Graduate Students          下载免费PDF全文

Kristin L. Bruns  Amber Letcher 《Journal of College Counseling》2018,21(2):111-124

The purpose of this study was to examine protective factors as predictors of suicide risk among graduate students (n = 413) at a large midwestern university. Using binary logistic regression, the authors assigned students to risk classifications (i.e., nonrisk group or suicide risk group). Results indicated emotional stability as the strongest predictor for participants’ placement into the nonrisk or suicide risk group. The authors discuss implications for counselors and directors of college counseling centers, as well as directions for future research.  相似文献   

Mathematics in early childhood: Teacher educators’ accounts of their work     

Kristin Lyn Whyte  M. Abigail Stein  Debbie Kim  Natalie Jou  Cynthia E. Coburn 《Journal of Early Childhood Teacher Education》2018,39(3):213-231

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The Relationship Between Motor Skill Proficiency and Body Mass Index in Preschool Children     

Samuel W. Logan  Kristin Scrabis-Fletcher  Christopher Modlesky  Nancy Getchell 《Research quarterly for exercise and sport》2013,84(3):442-448

Abstract

The purpose of this study was to examine the relationship between motor proficiency and body mass index (BMI) in preschool children. Thirty-eight children ages 4–6 years had their BMI calculated and were assessed using the Movement Assessment Battery for Children-2 (MABC-2; Henderson, Sugden, & Barnett, 2007). These data were analyzed in two ways. The correlation between BMI and MABC-2 percentile ranks was calculated. Next, the groups were subdivided based on BMI status (high, M = 85.5; medium, M = 49.8; low, M = 10.8), and compared using t tests to determine if differences existed in MABC-2 percentile ranks. No significant relationship existed between MABC-2 and BMI percentile ranks (r = -.237). However, significant differences in MABC-2 percentile ranks existed between high and low (p = .042), and high and medium (p = .043) groups. These results suggest that preschool children classified as overweight or obese may have lower motor proficiency than their normal weight and under weight peers. This study indicates there is a direct relationship between motor proficiency and BMI in the preschool population.  相似文献   

Book Reviews     

Kristin Semmens  Matthew Taylor  Matthew Klugman  Lionel Frost  John Hughson  Richard Haynes 《国际体育史杂志》2013,30(9):1292-1306

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Visualization of Twitter Data in the Classroom     

Betsy Page Sigman  William Garr  Robert Pongsajapan  Marie Selvanadin  Mindy McWilliams  Kristin Bolling 《Decision Sciences Journal of Innovative Education》2016,14(4):362-381

The expression “big data” is ubiquitous in the business world today, but few undergraduate business students have the opportunity to gain practical experience with how new business analytics tools can be used in decision making. This article describes a set of hands‐on labs that prepare students to incorporate streaming data analysis into group research projects. Splunk is used to help students analyze and visualize streaming social media data. An evaluation of student projects and student survey results show that this practical approach of training students to manipulate and visualize big data was largely successful in achieving instructional goals.  相似文献   

What would make them read more? Insights from Western Australian adolescents     

Margaret Kristin Merga 《Asia Pacific Journal of Education》2016,36(3):409-424

The link between recreational book reading and improved literacy performance is consistently supported by educational research. Increasing engagement in recreational book reading remains imperative for English teachers, though how to best facilitate this in a secondary context is an object of contention, with limited research in this field. The West Australian Study in Adolescent Book Reading explored attitudes and engagement in recreational book reading. Student responses provide valuable insight directly from the target group that can help to shape best practice for adolescent literacy educators. Findings are presented around six key themes, and include strategies for choice, access to attractive and diverse books, time availability, time allocation, concentration and encouragement.  相似文献   

Review of Spector,J.M., &amp; Yuen,A.H.K. (2016). <Emphasis Type="Italic">Educational technology program and project evaluation</Emphasis>. New York: Routledge     

Kristin Elwood  Yi-Chun Hong  Wilhelmina Savenye 《TechTrends》2018,62(1):126-127

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INTRODUCTION TO SECTION TWO: SOCIALIZATION AND ENVIRONMENTAL FACTORS IN THE PHYSIOLOGY OF EMOTION     

Paul D. Hastings  Kristin A. Buss  Tracy A. Dennis 《Monographs of the Society for Research in Child Development》2012,77(2):39-41

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