A single bout of high-intensity interval exercise and work-matched moderate-intensity exercise has minimal effect on glucose tolerance and insulin sensitivity in 7- to 10-year-old boys

The purpose of this study was to assess the acute effect of high-intensity interval exercise (HIIE) and moderate-intensity exercise (MIE) on glucose tolerance, insulin sensitivity and fat oxidation in young boys. Eleven boys (8.8 ± 0.8 y) completed three conditions: 1) HIIE; 2) work-matched MIE; and 3) rest (CON) followed by an oral glucose tolerance test (OGTT) to determine glucose tolerance and insulin sensitivity (Cederholm index). Fat oxidation was measured following the OGTT using indirect calorimetry. There was no effect for condition on plasma [glucose] and [insulin] area under the curve (AUC) responses following the OGTT (P > 0.09). However, there was a “trend” for a condition effect for insulin sensitivity with a small increase after HIIE (P = 0.04, ES = 0.28, 9.7%) and MIE (P = 0.07, ES = 0.21, 6.5%) compared to CON. There was an increase in fat oxidation AUC following HIIE (P = 0.008, ES = 0.79, 38.9%) compared to CON, but with no differences between MIE and CON and HIIE and MIE (P > 0.13). In conclusion, 7- to 10-year-old boys may have limited scope to improve insulin sensitivity and glucose tolerance after a single bout of HIIE and MIE. However, fat oxidation is augmented after HIIE but not MIE.     

Scaling Constraints in Junior Tennis: The Influence of Net Height on Skilled Players’ Match-Play Performance

Purpose: The net height in tennis (0.91 m) is approximately 50% of a professional tennis player’s height. Children are also expected to play with this net height, even though it is approximately 70% of the average 10-year-old’s height. This study examined the immediate effect of lowering net height on the performance characteristics of skilled junior tennis players aged 10 years and younger. Method: Sixteen players were matched in 8 pairs of even tennis ability and same sex. Each pair played 25-min singles matches in 4 conditions that varied in net height (0.91 m, 0.78 m, 0.65 m, and 0.52 m). Match-play characteristics were analyzed via video replay. Results: Results showed that lowering the net height to 0.65 m and 0.52 m led to players adopting a more attacking style of play, as evidenced by a significant increase in the number of winners without a commensurate increase in errors and more shots struck inside the baseline. Lower nets also led to a greater percentage of successful first serves. The lowest net (0.52 m), however, reduced rally length significantly and therefore decreased hitting opportunities. Conclusion: These results offer support for equipment scaling to enhance match-play performance for skilled junior tennis players. We propose that current net height recommendations for junior tennis should be revised.     

Organizational justice in sport

Research on organizational justice in sport has evolved during the past fifteen years. Much of that research has focused on the perceived fairness of equity, equality, and need when making resource distributions (distributive justice) in intercollegiate athletics. Generally, those involved with intercollegiate athletics believe resource decisions based on equality and need are the most fair, but decisions appear to be based on different principles. Scholars have also begun examining the fairness of decision-making processes (procedural justice) and the communication of those decisions (interactional justice), and how organizational justice impacts organizational outcomes, such as job satisfaction. Additionally, research has expanded to include sport settings beyond intercollegiate athletics. This article summarizes the state of research by first reviewing the general organizational justice literature to conceptually describe the constructs of interest before providing a detailed examination of sport management specific research. The paper concludes with suggestions for future research on organizational justice in sport management.     

Beyond “what works”: A mixed-methods study of intervention effect modifiers in the Good Behavior Game

This mixed-methods study examines two moderators of the impact of the Good Behavior Game—implementation variability, participant risk status, and the interaction between them—as predictors of behavioral and academic outcomes. Quantitative data from 38 primary schools were utilized, with outcome data collected at baseline and 2-year follow-up. Behavior (disruptive behavior, prosocial behavior, and concentration problems) was assessed via the Teacher Observation of Classroom Adaptation Checklist. Reading attainment was assessed via national teacher assessment scores, and the Hodder Group Reading Test. Implementation fidelity/quality data were collected via independent observations. Participant risk status was modeled using a cumulative risk index. Multilevel modeling revealed that higher levels of fidelity/quality were associated with improved overall reading scores (d = 0.203–225), but worsening disruptive behavior among high-risk students (d = 0.560). Thematic analysis of qualitative interview data collected from 20 teachers identified six groups of at-risk students who were perceived to experience differential effects, and five key mechanisms underpinning these.     

Reading ability and sensitivity to morphological relations

The morpho-phonological nature of English orthography is examined in this study of the relation between morphological sensitivity and decoding ability in the latter elementary grades. Children in grades three to six were required to distinguish derivationally-related word pairs (e.g., nature-natural) from foil pairs that are related in spelling but not in morphology (e.g., ear-earth). The materials included both transparently-related (i.e., the second word incorporated the pronunciation of the first, as in person-personal) and complexly-related word pairs (i.e., the second word involved some change in pronunciation, as in atom-atomic). Across two experiments, these items were presented in either oral or written form along with various tests of reading ability, intelligence and phonological awareness. The results indicate that children's recognition of derivational relationships improved with grade-level. As anticipated, there was also a significant association between sensitivity to derivational relatedness and decoding ability which remains significant even when the word pairs were orally presented and even when phonological awareness in taken into account. Both phonological awareness and sensitivity to morphological structure emerge as important factors in decoding skill in the later elementary grades.     

Scales of Normality: Displays of Extreme Weight and Weight Loss in Blackpool 1920–1940

Developments in scientific and medical understanding of disability, as well as an influx of war-disabled veterans in 1914, led to transforming societal attitudes towards those with physical deformities. Thus, scholars suggest that the beginning of the twentieth century witnessed the sudden decline of freak shows as a popular form of entertainment. Whilst freak shows undeniably became less popular in metropolitan spaces such as London or Manchester, they thrived in seaside resorts; sites dedicated to the pursuit of leisure, pleasure and entertainment. This paper examines exhibitions of freakery at British seaside resorts from 1920 to 1940. Through examining the visual material and written reports associated with the displays of unusual bodies at the margins of British life, it argues that seaside freak shows remained centrally important forms of amusement in the twentieth century. Furthermore, it demonstrates how freak shows were constructed utilising public discourse relating to contemporary concepts of health, wellness and the ‘ideal’ or ‘average’ body. Focusing on Blackpool, the foremost health and pleasure resort of the period, this paper analyses exhibitions of extreme weight, to locate their role in the popular construction of ‘normal’ and ‘abnormal’ bodily size within contemporary British culture.     

Les transformations affines dans le ler cycle de l'école secondaire

Sans résumé     

Re-envisioning media literacy education as feminist arts-activism

ABSTRACT

This project interrogates the premises of media literacy education – the predominant approach to equipping K-12 students to navigate the contemporary media environment – by moving it beyond teaching students to critique commercial media toward undermining ideological messages about health, violence, race, and gender embedded in media discourses. This participatory programme evaluation uses mixed-methods to assess the effectiveness of an alternative, performing arts education-based approach to media literacy called The Girl Project (TGP), a feminist artist-activist programme based at a non-profit community theatre in Versailles, Kentucky. The 12–18 high school-aged girls who participate in TGP every year are engaged in workshops by guest artists from around the nation to express what they think is important for their audiences to understand about their lived experiences as girls in a conservative sociopolitical environment.

The project employed “youth-adult partnership model” to programme evaluation that involved working with programme alumni as co-researchers to evaluate TGP 2017. In June 2017, a team of eight co-researchers comprising alumni from the 2014, 2015, and 2016 classes met to develop evaluation questions and make data collection decisions. Data collection included surveys and interviews conducted pre- and post-programme with participants, field notes of the co-researchers’ observations of workshops and rehearsals, and feedback from guest artists and audience members. The team met again in January 2018 to collaboratively analyse how the data answered their evaluation questions. The survey data allowed us to see that girls’ statistical scores on mental health and body confidence measurements significantly improved after their participation in TGP, meaning that girls are less vulnerable to depression, anxiety, and eating disorders. In talking with participants and audience members, we learned that TGP participation increases girls’ self-confidence and ability to set boundaries in friendships, family relationships, and romantic relationships.     

She's Reddit: A source of statistically significant gendered interest information?

Information about gender differences in interests is necessary to disentangle the effects of discrimination and choice when gender inequalities occur, such as in employment. This article assesses gender differences in interests within the popular social news and entertainment site Reddit. A method to detect terms that are statistically significantly used more by males or females in 181 million comments in 100 subreddits shows that gender affects both the selection of subreddits and activities within most of them. The method avoids the hidden gender biases of topic modelling for this task. Although the method reveals statistically significant gender differences in interests for topics that are extensively discussed on Reddit, it cannot give definitive causes, and imitation and sharing within the site mean that additional checking is needed to verify the results. Nevertheless, with care, Reddit can serve as a useful source of insights into gender differences in interests.     

The effect of acute caffeine ingestion on upper body anaerobic exercise and cognitive performance

Abstract

The current study examined the effect of acute caffeine ingestion on mean and peak power production during upper body Wingate test (WANT) performance, rating of perceived exertion, readiness to invest effort and cognitive performance. Using a double-blind design, 12 males undertook upper body WANTs, following ingestion of caffeine (5?mg*kg^?1) or placebo. Pre-substance ingestion, 60?mins post substance ingestion and post exercise participants completed measures of readiness to invest physical and mental effort and cognitive performance. Peak power was significantly higher (P?=?.026), fatigue index greater (P?=?.02) and rating of perceived exertion lower (P?=?.025) in the presence of caffeine. Readiness to invest physical effort was also higher (P?=?.016) in the caffeine condition irrespective of time point (pre, 60?mins post ingestion and post exercise). Response accuracy for incongruent trials on the Flanker task was superior in the presence of caffeine (P?=?.006). There was a significant substance?×?time interaction for response speed in both congruent and incongruent conditions (both P?=?.001) whereby response speeds were faster at 60?mins post ingestion and post exercise in the caffeine condition, compared to placebo. This is the first study to examine the effects of caffeine ingestion on this modality of exercise and suggests that caffeine ingestion significantly enhances peak power, readiness to invest physical effort, and cognitive performance during WANT performance.