Between-limb asymmetry in kinetic and temporal characteristics during bilateral plyometric drop jumps from different heights     

Yi Y. Lim  Thorsten Sterzing  Crosby J.Y. Teo  Rebecca Alonzo  Jing W. Pan  Phillis S.P. Teng 《Journal of sports sciences》2020,38(14):1605-1614

ABSTRACT

This study investigated the between-limb asymmetry in kinetic and temporal characteristics during bilateral plyometric drop jumps from different heights. Seventeen male basketball players performed drop jumps from 3 heights on two platforms in randomized orders. Vertical ground reaction force data were analysed with respect to the lead limb (i.e. the limb stepping off the raised platform first) and trail limb. Peak forces and loading rates of each limb were calculated. The absolute time differential between the two limbs at initial ground contact and takeoff were determined. The frequency of symmetrical landing and taking off with “both limbs together” were counted using 3 time windows. Results showed that the lead limb displayed higher peak forces and loading rates than the trail limb across all heights (p <.05). As drop height increased, the absolute time differentials decreased at initial ground contact (p <.001) but increased at takeoff (p =.035). The greater the preset time window, the more landings and takeoffs were classified as bilaterally symmetrical. In conclusion, higher drop heights allowed subjects to become more bilaterally symmetrical in the timing of landing but this reduction in temporal asymmetry did not accompany with any reduction in kinetic asymmetry.  相似文献   

The Island Frontier: Socotra,Sri Lanka and the Shape of Commerce in the Late Antique Western Indian Ocean     

Rebecca Darley 《Al-Masaq: Islam & the Medieval Mediterranean》2019,31(2):223-241

ABSTRACT

The islands of Sri Lanka and Socotra c. 200–700 provide a useful comparison, both with each other and with islands in the Late Antique and medieval Mediterranean. Using the analytical framework of frontiers as a comparative tool, this study proposes using the parameters of scale and proximity in order to evaluate where the frontier(s) of an island lay (along the shoreline or within an island space, sometimes both) and the difficulty or ease of controlling them from inside or outside the island. In its results, this analysis allows for change over time, but also establishes the diachronic effect of physical parameters. It offers a new way through the insular dichotomy of isolation versus connectivity and indicates a particularity of Mediterranean islands. This exploratory approach also sheds new light on an embargo established in ancient Socotra, suggesting it to have been a much shorter-lived phenomenon than previously speculated.  相似文献   

Meeting Our Users Where They Conference: A Texas A&M Model to Support Librarian Attendance at Subject-Specific Conferences     

Rebecca Hankins  Pauline Melgoza  Christina Seeger  Gary Wan 《Public Services Quarterly》2013,9(2):98-113

Today's academic librarian is frequently called upon to function as a subject specialist, with or without advanced degrees in other disciplines. One method of monitoring trends within a given field is to study its literature; another is to attend conferences in the discipline. Discipline-specific conference attendance by academic librarians provides opportunities to interact with faculty in their disciplines that result in an increased communication with faculty, improved reference expertise, and more focused collection development. This paper describes the Texas A&M University Libraries' support for conference attendance and examples of the resulting benefits.  相似文献   

Relief in Hard Times: A Defense of Jon Stewart's Comedy in an Age of Cynicism     

W. Lance Bennett 《Critical Studies in Media Communication》2013,30(3):278-283

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Sage Research Methods Online (SRMO)     

Rebecca McKay 《Journal of the Medical Library Association》2013,101(1):81-82

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The Unique Role of Early Spelling in the Prediction of Later Literacy Performance     

Rebecca Treiman  Jacqueline Hulslander  Richard K. Olson  Erik G. Willcutt  Brian Byrne  Brett Kessler 《Scientific Studies of Reading》2013,17(5):437-444

ABSTRACT

We examined the predictive value of early spelling for later reading performance by analyzing data from 970 U.S. children whose spelling was assessed in the summer following the completion of kindergarten (M age = 6 years; 3 months). The word reading performance of most of the children was then tested after the completion of Grade 1 (age 7;5), Grade 2 (8;5), Grade 4 (10;5), and Grade 9 (15;5). A computer-scored measure of postkindergarten spelling was a significant predictor of later reading performance even after taking into account postkindergarten phonological awareness, reading, and letter-sound knowledge and prekindergarten vocabulary. The results suggest that, by the end of kindergarten, spelling is more than just a proxy for phonological awareness and letter-sound knowledge. Given the information that spelling provides, it should be considered for inclusion when screening children for future literacy problems.  相似文献   

A Second-Order Conditionally Linear Mixed Effects Model With Observed and Latent Variable Covariates     

Jeffrey R. Harring  Nidhi Kohli  Rebecca D. Silverman  Deborah L. Speece 《Structural equation modeling》2013,20(1):118-136

A conditionally linear mixed effects model is an appropriate framework for investigating nonlinear change in a continuous latent variable that is repeatedly measured over time. The efficacy of the model is that it allows parameters that enter the specified nonlinear time-response function to be stochastic, whereas those parameters that enter in a nonlinear manner are common to all subjects. In this article we describe how a variant of the Michaelis–Menten (M–M) function can be fit within this modeling framework using Mplus 6.0. We demonstrate how observed and latent covariates can be incorporated to help explain individual differences in growth characteristics. Features of the model including an explication of key analytic decision points are illustrated using longitudinal reading data. To aid in making this class of models accessible, annotated Mplus code is provided.  相似文献   

Pornography‐Dot‐Com: Eroticising Privacy on the Internet     

David Bennett 《Review of Education, Pedagogy & Cultural Studies》2013,35(4):381-391

“Of the $10 billion sex industry, it's not ten perverts spending $1 billion a year” ‐‐ Nadine Strossen, former president of the American Civil Liberties Union and author of Defending Pornography.  相似文献   

Learning to Read Words in Albanian: A Skill Easily Acquired     

Margo Bowman  Rebecca Treiman 《Scientific Studies of Reading》2013,17(2):153-170

According to many views of literacy development, prereaders use a logographic approach when they attempt to link print and speech. If so, these children should find pairs in which the spelling–pronunciation links are consistent with their writing system no easier to learn than arbitrary pairs. We tested this idea by comparing the ability of U.S. prereaders (M age = 4 years 9 months) to learn phonetically motivated pairs like AP–ape and MA–may and arbitrary pairs like OM–ape and PO–may. In both spelling and reading tasks, children learned the pairs with vowel letter name cues more easily than the arbitrary pairs. Phonetically motivated pairs were especially advantaged when the vowel letter names were at the beginning (e.g., AP–ape) rather than the end (MA–may). Prereaders who have some knowledge about letters, as U.S. preschoolers typically do, are not limited to a logographic approach in learning about print.  相似文献   

Clinical Symptoms as a Function of Client Personality in College Students: Incorporating the Five‐Factor Model of Personality     

Marie S. Hammond  Jennifer D. Lockman  Rebecca A. Temple 《Journal of College Counseling》2013,16(1):6-18

In this study, the relationship between personality characteristics and presenting clinical symptoms of individuals at a college counseling center was examined. Analysis of assessments of personality ( Costa & McCrae, 1992 ) and mental health symptoms ( Farrell & McCullough, 1989 ) suggests that the personality characteristics of individuals presenting for assistance at a college counseling center systematically vary from those of a general college population. Furthermore, differing patterns of client personality characteristics were related to various symptom categories.  相似文献