Analysis of performance in orienteering with treadmill tests and physiological field tests using a differential global positioning system

The aim of this study was to determine the physiological responses to orienteering by examining the interrelationships between the information provided by a differential global positioning system (dGPS) about an orienteer's route, speed and orienteering mistakes, portable metabolic gas analyser data during orienteering and data from incremental treadmill tests. Ten male orienteers completed a treadmill threshold test and a field test; the latter was performed on a 4.3 km course on mixed terrain with nine checkpoints. The anaerobic threshold, threshold of decompensated metabolic acidosis, respiratory exchange ratio, onset of blood lactate accumulation and peak oxygen uptake (VO2peak) were determined from the treadmill test. Time to complete the course, total distance covered, mean speed, distance and timing of orienteering mistakes, mean oxygen uptake, mean relative heart rate, mean respiratory exchange ratio and mean running economy were computed from the dGPS data and metabolic gas analyser data. Correlation analyses showed a relationship between a high anaerobic threshold and few orienteering mistakes (r = - 0.64, P < 0.05). A high threshold of decompensated metabolic acidosis and VO2peak were related to a fast overall time (r = -0.70 to -0.72, P < 0.05) and high running speed (r = 0.64 to 0.79, P < 0.05 and P < 0.01, respectively), and were thus the best predictors of performance.     

Evaluation of a specific test in cross-country skiing

Six Danish male cross-country skiers were studied during the end-of-summer and winter seasons. Their maximal oxygen uptake was measured while running on a treadmill and using a ski ergometer incorporating the double-poling technique. Maximal oxygen uptake during treadmill running and double-poling was correlated with performance, expressed as a ranking score during 10 ski races. The tests were undertaken in September, December and April. Upper body maximal oxygen uptake increased 5.8% from September to December, decreasing to 2.3% above the September level in April. Upper body work output (2 min at maximal intensity) increased 11.8% from September to December (P less than 0.05). The relationship between upper body and leg maximal oxygen uptake--the upper body/leg ratio--was 89.4% in September. In four skiers, both treadmill and upper body tests were undertaken on each test occasion. The upper body/leg ratio changed from 87.7% in September to 95.7% in December. In April, the ratio was 91.0%. The maximal oxygen uptake measured using the ski ergometer during double-poling was significantly correlated with performance (P less than 0.05). It is concluded that the upper body ski ergometer can be used in the evaluation of elite cross-country skiers.     

Grasping the essence of a science activity by using a model of pedagogical reasoning and action

This article grasps the essence of how a science content can be foregrounded by elaborating around concepts as floating and sinking, in relation to boats. The data consist of a videotaped authentic session with one preschool teacher and four children. The model of pedagogical reason and action [Shulman, L. S. 1987. “Knowing and Teaching: Foundations of the New Reform.” Harvard Educational Review 57 (1): 1–23. doi:10.17763/haer.57.1.j463w79r5645541] constitutes the analytical lens. The results show that the content is framed within a series of creative activities where children’s suggestions of how to act are crucial. The scientific content is approached according to the children’s verbalisations of their understandings. Furthermore, dialectical relationships become the main tool when making the content visible.     

Student Learning about Biomolecular Self-Assembly Using Two Different External Representations

Self-assembly is the fundamental but counterintuitive principle that explains how ordered biomolecular complexes form spontaneously in the cell. This study investigated the impact of using two external representations of virus self-assembly, an interactive tangible three-dimensional model and a static two-dimensional image, on student learning about the process of self-assembly in a group exercise. A conceptual analysis of self-assembly into a set of facets was performed to support study design and analysis. Written responses were collected in a pretest/posttest experimental design with 32 Swedish university students. A quantitative analysis of close-ended items indicated that the students improved their scores between pretest and posttest, with no significant difference between the conditions (tangible model/image). A qualitative analysis of an open-ended item indicated students were unfamiliar with self-assembly prior to the study. Students in the tangible model condition used the facets of self-assembly in their open-ended posttest responses more frequently than students in the image condition. In particular, it appears that the dynamic properties of the tangible model may support student understanding of self-assembly in terms of the random and reversible nature of molecular interactions. A tentative difference was observed in response complexity, with more multifaceted responses in the tangible model condition.     

Tweeting the Viewer—Use of Twitter in a Talk Show Context

Twitter is currently one of the most popular outlets of so-called social media, Internet services that allow their users to communicate and share content in a variety of ways. As with the Internet itself, Twitter has been heralded to hold interesting possibilities within the context of journalism—potentially bringing journalists and their respective audiences closer to each other through supposedly common Twitter practices like @ messages and retweeting. This article presents a large-scale empirical study on Twitter use in the journalistic context. The aim is to assess patterns of journalist-audience interaction on Twitter. Specifically, the article outlines a structural analysis of Twitter use pertaining to the first season of the current events talk show Hübinette, which aired on Swedish public service television during the fall of 2011. Employing state-of-the-art approaches for data collection and analysis, the article shows that while traditional patterns of journalist-reader relationships are most common, some users are employing the Twitter platform in somewhat unforeseen ways.     

Pervasive and Non‐pervasive Conduct Problems in a Clinic Sample Aged 4–8 years: Child,family and day‐care/school factors

Differences between pervasive (home and day‐care/school) versus non‐pervasive (home only) conduct problems were examined in regard to various child, parent/family, and day‐care/school characteristics in an outpatient clinic sample of 120 children aged 4–8 years. All children scored above the 90th percentile on the Eyberg Child Behavior Inventory for home problems and met the criteria for a possible or a confirmed diagnosis of oppositional defiant behaviours. The proportion of children with pervasive conduct problems was high, 83%. Teachers in day care and school reported children in the pervasive group to have significantly more attention and internalizing problems as well as lower social competence scores than those in the non‐pervasive group. Children in the pervasive group also showed consistently more problems in their relationships both with teachers and peers than those in the non‐pervasive group. The implications for assessment and treatment of children with conduct problems in these age‐groups are discussed.     

How Simple is the Simple View of Reading?

According to the Simple View of Reading, reading ability can be divided into decoding and language comprehension. In the present study, decoding and comprehension's contribution to reading ability was studied both in children with reading difficulties and in children with typical reading ability. Decoding and comprehension was further divided into sub-components, and the contribution from non-verbal ability and general processing speed was also studied. The results demonstrated that decoding made the largest contribution to reading ability for children with reading difficulties, while language comprehension contributed the most for children with typical reading ability. The contribution of non-verbal ability was not significant, and general processing speed only made a significant contribution to decoding for typical children. The two factors in the Simple View of Reading, decoding and comprehension, together explained less of the variance in reading ability for children with reading difficulties than for children with typical reading ability.     

User Experiences with Editorial Control in Online Newspaper Comment Fields

This article investigates user experiences with editorial control in online newspaper comment fields following the public backlash against online comments after the 2011 terror attacks in Norway. We analyze data from a survey of online news consumers focusing on experiences and attitudes towards editorial control set against a spectrum between “interventionist” and “noninterventionist” positions. Results indicate that interventionist respondents rate the quality of online comments as poor, whereas noninterventionist respondents have most often experienced being the target of editorial control measures and feel that editorial control has intensified after the terror attacks. We conclude that newspapers should pay attention to the different needs of participants when devising strategies for editorial control. Media professionals should also consider changes to increase the transparency of moderation practices.     

Beyond “J-Tweeters”

Based on a survey (N?=?1613) directed to members of the Norwegian Journalist Association (NJ), this paper presents an extensive overview of the ways in which comparably older and newer online platforms have been incorporated into the professional lives of Norwegian journalists. While plenty of research is available that explores the uses of Twitter by journalists, the results presented here suggest that Facebook is by far the most frequently used platform throughout the journalistic process—from collecting information, distributing content and engaging with readers. Statistical analyses provide further insights into which variables appear to influence certain modes of usage across the studied platforms. Based on the results, the argument is made that the advantages of using Facebook as a platform for journalistic practices are obvious due to its popularity among the general public, but that this utilization of one platform over others also could be problematic. As Facebook continues to gain leverage towards the newspapers they host, questions of journalistic practices need to come to the fore.     

Elite Interaction

While a good deal of research has examined the uses of Twitter in journalism, comparably few research projects employ comparative research designs in order to provide new insights. The present study details Twitter use by public service broadcasters (PSBs) during recent national elections in Norway and Sweden. Utilizing quantitative analysis of social media content in tandem with qualitative interviews with key PSB journalists, the main results indicate that while the PSB organizations—the Norwegian NRK and the Swedish SVT—are both frequently contacted by “regular” citizens on Twitter, they seem to prefer to retweet and interact with journalists, politicians or other “elite” users. Compared with the interviews performed, the study uncovers an interesting tension as journalists often talk about the need to engage with “regular” users—a practice that is arguably in line with PSB regulations, but that is seldom adhered to in the contexts studied here.