The Ethics of Performance-Enhancing Technology in Sport     

Sigmund Loland 《体育哲学杂志》2013,40(2):152-161

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An analysis of teacher-defined activities with mobile technologies: predecessor and successor tool use in the classroom     

Louise Mifsud  Anders I. Mørch  Sigmund Lieberg 《Learning, Media and Technology》2013,38(1):41-56

In this paper, different perspectives on the role of the teacher in a classroom equipped with personal digital assistants (PDAs) are presented. We report on four classroom studies conducted in two countries, Norway and the USA. The overall aim is to understand the use of new tools in different contexts. The key question that we explore concerns the teachers’ pedagogical use of the new tool and why certain tools are adopted and others are not. In one case, the activities simulated the affordances and constraints of the tools used prior to the PDA. In the other case, the activities harnessed the affordances and constraints offered by the successor tool, the PDA. We raise the question as to why these tools were used in two different ways. We analyse our findings in terms of sociocultural theory and concepts of human–computer interaction. Finally, we summarize our results and discuss some educational implications.  相似文献   

Validity of the ActiGraph GT1M during walking and cycling     

Bjorge Herman Hansen  Ingvild Børtnes  Maria Hildebrand  Ingar Holme  Elin Kolle  Sigmund Alfred Anderssen 《Journal of sports sciences》2013,31(6):510-516

Abstract

The ActiGraph activity monitors have developed and newer versions of the ActiGraph accelerometers (GT1M, GT3X and GT3X +) are now available, including changes in hardware and software compared to the old version (AM7164). This is problematic as most of the validation and calibration work includes the AM7164. The aims of the study were to validate the ActiGraph GT1M during level and graded walking and to assess the potential underestimation of physical activity during cycling. Data were obtained from 20 participants during treadmill walking and ergometer cycling. Energy expenditure was measured via indirect calorimetry and used as the criterion method. Activity counts were highly correlated with energy expenditure during level walking (R² = 0.82) and graded walking at 5% and 8% (R² = 0.82 and R² = 0.67, respectively). There was no linear relationship between activity counts and energy expenditure during cycling. The average activity counts for all data points during cycling was 1,157 counts per minute (CPM) (SD = 974), and mean energy expenditure was 5.0 metabolic equivalents. The GT1M is a valid tool for assessing walking across a wide range of speeds and gradients. However, there is no relationship between activity counts and energy expenditure during cycling and physical activity is underestimated by ≈73% during cycling compared to walking.  相似文献   

Effects of the Active Smarter Kids (ASK) Physical Activity School-based Intervention on Executive Functions: A Cluster-Randomized Controlled Trial     

Katrine Nyvoll Aadland  Yngvar Ommundsen  Sigmund Alfred Anderssen  Kolbjørn Selvåg Brønnick  Vegard Fusche Moe  Geir Kåre Resaland 《Scandinavian Journal of Educational Research》2019,63(2):214-228

The purpose of this study was to examine the effects of a seven-month curriculum prescribed physical activity (PA) intervention (the Active Smarter Kids [ASK] intervention) on executive functions in 10-year-old Norwegian children. A linear mixed model was used to analyze data from 971–1,123 fifth grade children at 28 intervention schools and 29 control schools. The intervention constituted three PA elements: PA educational lessons, PA breaks, and PA homework, adding 165 minutes of PA to the mandatory 135 minutes of PA and physical education. There was no effect of the intervention on executive functions in the intention-to-treat analyses. Per protocol analyses (n?=?776–850) revealed small effects of the intervention on the composite score of executive functions, cognitive flexibility, and motor skills. Cognitively engaging and coordinative demanding activities/games seem viable options to increase executive functions and possibly improve academic performance in children.  相似文献   

Determination of the prevalence of anabolic steroids, stimulants, and selected drugs subject to doping controls among elite sport students using analytical chemistry     

Thevis M  Sauer M  Geyer H  Sigmund G  Mareck U  Schänzer W 《Journal of sports sciences》2008,26(10):1059-1065

Drug abuse by adolescents has been investigated in various surveys that reported correlations between age, gender, and activity. However, none of these studies included chemical analyses to help substantiate the statements of participants. In the present study, the urine specimens of 964 students (439 females, 525 males; mean age 22.1 years, s = 1.7), who applied to study sports sciences at university, were assessed for anabolic steroids, stimulants, and selected drugs prohibited in sports. In total, 11.2% of the urine specimens provided contained drugs covered by doping controls. The most frequently detected compound was the major metabolite of tetrahydrocannabinol (9.8%) followed by various stimulants related to amphetamine and cocaine (1.0%). Indications of anabolic steroid use were found in 0.4% of urine samples but originated from contraceptives containing norethisterone. The present study provided unambiguous data on the status quo of drug (ab)use by adolescents hoping for a career related to elite sport or sports sciences. No use of anabolic steroids was detected. However, evidence for stimulants and tetrahydrocannabinol administration was obtained, although not reported by any participant, which highlights the issue of under-reporting in surveys based solely on questionnaires.  相似文献