Walking and biologic ageing: Evidence based on NHANES telomere data     

Larry A. Tucker 《Journal of sports sciences》2020,38(9):1026-1035

ABSTRACT

The length of telomeres is an objective measure of biologic ageing. This study evaluated the extent minutes of walking per week are associated with leukocyte telomere length (LTL) in a random sample of 5,823 U.S. adults. The investigation was cross-sectional and data were obtained from the National Health and Nutrition Examination Survey (NHANES). LTL was measured by the quantitative polymerase chain reaction method. Walking minutes was calculated from walking frequency and duration measures. Results showed that for each year of chronological age, telomeres were 15.6 base pairs shorter (P < 0.0001). With walking minutes and LTL treated as continuous variables, the relationship was quadratic, not linear (F = 11.2, P = 0.0023). With walking time divided into three categories, adults who performed ≥ 150 minutes of walking per week had longer telomeres than those who did no regular walking, and those who did some, but less than the recommendation (F = 5.0, P = 0.0137). Regular walkers were estimated to have a biologic ageing advantage associated with 6.5–7.6 years less biologic ageing compared to non-walkers, after adjusting for covariates. Additional investigations designed to study causality and the mechanisms associated with the walking and LTL relationship are needed.  相似文献   

Dust,Disease, Death and Deity: Constructing and Deconstructing the “Dust Bowl”          下载免费PDF全文

Neil Larry Shumsky 《Journal of American culture (Malden, Mass. : 2003)》2015,38(3):218-231

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Preparing the Next Generation of Educational Measurement Specialists: A Call for Programs With an Integrated Scope and Sequence     

Mike Russell  Larry Ludlow  Laura O'Dwyer 《Educational Measurement》2019,38(4):78-86

The field of educational measurement has evolved considerably since the first doctoral programs were established. In response, programs have typically tacked on courses that address newly developed theories, methods, tools, and techniques. As our review of current programs evidences, this approach produces artificial distinctions among topics and techniques that are in fact a tightly coupled whole. This position paper advocates a redesign of the scope and sequence for doctoral programs focused on the preparation of the next generations of educational measurement specialists; a redesign that reflects the full life‐cycle of instrument development and use.  相似文献   

Pride versus prudence: the precarious queer politics of Pink Dot     

Ng Yi-Sheng 《Inter-Asia Cultural Studies》2017,18(2):238-250

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Outside school time: an examination of science achievement and non-cognitive characteristics of 15-year olds in several countries     

Larry E. Suter 《International Journal of Science Education》2016,38(4):663-687

Elementary and secondary students spend more hours outside of class than in formal school and thus have more time for interaction with everyday science. However, evidence from a large international survey, Program of International Student Assessment (PISA) (OECD 2012), found a negative relationship between number of hours attending after-school science and science assessment scores in many countries, raising questions about why. The secondary analysis of the 2006, 2009, and 2012 PISA surveys found that in most Western countries the longer students attended after-school science programs (in a typical week), the lower their PISA standardized science test score, but the higher their positive attitudes toward future science careers, interest in science, and self-confidence in science. Several potential hypotheses for this relationship are examined and rejected. Further analysis of a causal relationship between frequent attendance in after-school programs and student achievement and attitudes should clearly identify the content of the program so that the analysis could distinguish experiences closely related to regular school curricula from the informal science activities that are not. A new analysis also should include carefully designed longitudinal surveys to test the effectiveness of informal experiences on later life choices in career and study.  相似文献   

CD-ROM talking books: what do they promise?     

Jillian DeJean  Larry Miller  Jon Olson 《Education and Information Technologies》1997,2(2):121-130

This study describes one teacher's use of multimedia, specifically CD-ROM talking books, in the classroom. The goal of the investigation was to reveal and analyse how a primary (Grade 3) teacher integrated CD-ROM books into her curriculum. Issues emerging from the study included how features of the software interact with features of classrooms, how patterns of instruction are affected by the infusion of technology, and how students interact with the software, and each other, while reading the CD- ROM books  相似文献   

1994 special issue of the journal of research in science teaching on: Reading,writing, and science understanding     

Larry D. Yore  William G. Holliday  Donna E. Alvermann 《科学教学研究杂志》1992,29(5):533-533

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Faculty perceptions of the quality and usefulness of three types of evaluative information     

John C. Ory  Larry A. Braskamp 《Research in higher education》1981,15(3):271-282

The purpose of the study was to investigate faculty perceptions of student evaluative information collected by three methods: objective questionnaire items, open-ended questions, and group interviews. Faculty rated three simulated evaluation reports on their potential for accuracy, trustworthiness, usefulness, comprehensiveness, believability, interpretability, and value as information used for self-improvement and promotion purposes. Faculty, in general, regarded the evaluative information to be more credible, useful, and accurate for their own self-improvement than for promotion purposes. Faculty also desired more than one type of evaluative information regardless of the purpose of evaluation.  相似文献   

How the world’s most improved school systems keep getting better     

Pak Tee Ng 《Journal of Educational Change》2011,12(4):463-468

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“I learn for a job promotion!”: the role of outcome-focused career goals in motivating distance learners to learn     

Clarence Ng 《Distance Education》2018,39(3):390-410

Outcome-focused career goals are concerned about studying for tangible career benefits. To what extent do these goals motivate distance learners to learn? Using a mixed-method design, Study 1 found that career-focused learners, when compared with noncareer-focused counterparts, had a propensity to endorse outcome-focused career goals, use surface strategies, value their learning, and achieve better course results. Interview findings showed that career-focused learners used a strategic approach to ensure the timely completion of tasks and examination preparation. Study 2 located two groups of career-focused learners (autonomous and controlled) who endorsed outcome-focused career goals, alongside a noncareer-focused group. MANOVA analyses found that autonomous and noncareer-focused learners had engaged learning patterns. Although controlled learners were less engaged in learning, they achieved better results. It was concluded that outcome-focused career goals are significant sources of motivation for distance learners, despite being extrinsic to learning.  相似文献