Effect of gender on trunk and pelvis control during lateral movements with perturbed landing

In lateral reactive movements, core stability may influence knee and hip joint kinematics and kinetics. Insufficient core stabilisation is discussed as a major risk factor for anterior cruciate ligament (ACL) injuries. Due to the higher probability of ACL injuries in women, this study concentrates on how gender influences trunk, pelvis and leg kinematics during lateral reactive jumps (LRJs). Perturbations were investigated in 12 men and 12 women performing LRJs under three different landing conditions: a movable landing platform was programmed to slide, resist or counteract upon landing. Potential group effects on three-dimensional trunk, pelvic, hip and knee kinematics were analysed for initial contact (IC) and the time of peak pelvic medial tilt (PPT). Regardless of landing conditions, the joint excursions in the entire lower limb joints were gender-specific. Women exhibited higher trunk left axial rotation at PPT (women: 4.0 ± 7.5°, men: ?3.1 ± 8.2°; p = 0.011) and higher hip external rotation at both IC and PPT (p < 0.01). But women demonstrated higher knee abduction compared to men. Men demonstrated more medial pelvic tilt at IC and especially PPT (men: –5.8 ± 4.9°, women: 0.3 ± 6.3°; p = 0.015). Strategies for maintaining trunk, pelvis and lower limb alignment during lateral reactive movements were gender-specific; the trunk and hip rotations displayed by the women were associated with the higher knee abduction amplitudes and therefore might reflect a movement strategy which is associated with higher injury risk. However, training interventions are needed to fully understand how gender-specific core stability strategies are related to performance and knee injury.     

The emotional labor of doing ‘boy work’: Considering affective economies of boyhood in schooling

Abstract

Internationally, the research on the education of boys has sought to understand how social practices, behaviours and rituals contribute to identity construction. We are interested in approaches to the emotional labor of doing ‘boy work’. As educators grapple with the gendered performances and subjectivities of young men, there is an imperative to engage with the affective dimensions of boyhood. We explore what theories of affect can add to our understandings of masculinities and masculine identity practices in rapidly changing affective economies of gender and, specifically, what this may mean for relationships formed between educators and students. To illustrate how theories of affect can open up new analytical spaces, we present two vignettes from a program in the United States designed to support young men and boys to gain critical awareness of restrictive ‘gender norms’. Drawing primarily upon Ahmed’s work on affective economies, we theorize how attention to affective economies of boyhood can positively influence the work of educators today.     

A multimodal critical discourse analysis of anti-vaccination information on Facebook

In light of recent outbreaks of measles and other vaccine-preventable diseases, childhood vaccination has been the subject of significant attention and controversy. Much information seeking and debates about vaccines take place on social media, yet the effects of information context-specific factors on parental information seeking and sharing and information source assessment remain unknown. Through the lenses of reductionist thinking and cognitive authority, this study employed a multimodal critical discourse analysis approach to analyze the textual and graphic information within a public anti-vaccine Facebook group. Findings show that parental information seeking and sharing worked to create an isolated, sentimentalized information context favoring immediacy and emotional impact over scientific research and statistical evidence. Because participants shared fundamental beliefs and goals around vaccines, group members held cognitive authority despite the lack of expertise or evidentiary support in their postings. This controversial information-based movement poses challenges and opportunities for library outreach and information provision.     

Conduct disorder and comorbidity

Conduct Disorder (CD) research is focusing on complex issues introduced by comorbidity because of its widespread existence, thoeretical importance and practical significance. This review provides critical examination of research published during the past ten years addressing CD and its comorbid conditions, specifically Attention‐Deficit Hyperactivity Disorder (ADHD), Oppositional Defiant Disorder (ODD), and internalizing disorders. It is concluded that comorbidity varies with age, gender, informant, diagnostic criteria, and nature of the sample (clinical vs. epidemiological). Implications of comorbidity for etiology, diagnosis, treatment, law, and policy and preventive efforts in work with children and adolescents with CD are offered for school psychologists. © 1999 John Wiley & Sons, Inc.     

Strategies for Selling Paid Content on Newspaper and Magazine Web Sites: An Empirical Analysis of Bundling and Splitting of News and Magazine Articles

More and more newspaper and magazine Web sites offer paid content. However, selling information goods at a price higher than the marginal cost means finding a strategy for product or price differentiation. A possible strategy to solve this problem is the bundling of information goods. In this article, we analyze empirically, with quantitative statistic methods, strategies for selling bundled and unbundled content on newspaper and magazine Web sites. This analysis is based on the theoretical approach of Bakos and Brynjolfsson (1996). The article shows that a cannibalization takes place if the same bundle of information goods is offered in offline (printed) and online (digital) media at the same time. Traditional bundling models work nonetheless in an online media if the online content is rebundled (e.g., as dossiers about a topic), but thereby do not compete with the printed version.     

This business of announcing

Speech Pathology. By Lee Edward Travis. Appleton and Co., 1931.

Method of Argument. By Charles A. Fritz. New York: Prentice‐Hall, 1931; pp. ix, 395.

Debating. Compiled and Edited by Raymond F. Howes. D. C. Heath &; Company, 1931; pp. XVI, 182; $1.00.

Public Speaking for Executives. By Charles W. Mears. New York: Harper and Brothers, 1931; pp. xiv, 194; $3.

Die Problematik der Sprachheilschule in Ihrer Geschichtlichen Ent‐wicklung. By Karl Hansen. Halle: Carl Marhold, 1929; pp. 100. 3.60 marks.

An Analytical Contrast of Oral With Written English. By Paul P. Bushnell, Ph.D. Columbia University Press, New York, 1930.

Ambidexterity and Mental Culture. By H. MacNaughton‐Jones. Rebman Company, New York City. No date. 102 pages.     

Epistemological beliefs and self-regulated learning with hypertext

This study investigated the relationship between epistemological beliefs, prior domain knowledge and self-regulated learning. Biology students (n?=?25) and humanities students (n?=?26) who varied in their epistemological beliefs learned with a hierarchical hypertext about the topic of genetic fingerprinting. During their learning processes, logfiles and questionnaire data were collected. Results indicate that students do metacognitively calibrate their learning process to the complexity of the presented learning material, e.g. by processing more complex deeper-level nodes longer. Furthermore, these calibration processes were significantly related to epistemological beliefs. For example, more ‘sophisticated’ epistemological beliefs were associated with processing more nodes, whereas more ‘naïve’ beliefs were related to spending more time on single nodes. Both effects were especially pronounced on deeper hierarchical hypertext levels. Prior domain knowledge also had an impact, especially on comprehensibility ratings: biology students considered all nodes more comprehensible than humanities students. Additionally, epistemological beliefs as well as prior domain knowledge were also significantly associated with the learning outcome: for example, more prior domain knowledge led to significantly higher learning outcome.     

Is adaptation to task complexity really beneficial for performance?

Theories of self-regulated learning assume that learners flexibly adapt their learning process to external task demands and that this is positively related to performance. In this study, university students (n = 119) solved three tasks that greatly differed in complexity. Their learning processes were captured in detail by task-specific questionnaires and computer-generated log files. Results indicate that students adapted almost all learning processes significantly to task complexity. For example, students accessed more hypertext pages for complex tasks than for simple tasks. However, this kind of adaptation was not consistently related to performance. For variables capturing learners’ self-regulation, such as the number of accessed hypertext pages, more pronounced adaptation was significantly and positively related to performance even when learners’ general processing depth was statistically controlled. Results were less consistent for variables capturing learners’ self-monitoring, such as their judged task complexity.