The expansion of access to devices, as well as the production and publication options in social networks requires a broader definition of the traditional notion of personal digital storytelling. To get a deeper understanding of these practices in the group of adolescents, the objective of this article is to analyze what are the reasons that direct the publications of personal stories and what kind of filters, agents and consequences are articulated in these stories. To do this, the most qualitative part of an investigation on teenagers’ internet publication guidelines is synthesized. Specifically, the results of a semi-structured interview with 12 adolescents between 12 and 20 years are shown. The answers show that the interviewees’ perspective on what a digital story is goes beyond the format and varies depending on the network where it is published and the type of content. Thus, the emphasis and motivation of the publication has shifted from the digital - which has been incorporated with something normal and not differential - towards the personal, focusing the publications on the daily life of young people. An extension and refinement of the public-private dichotomy has been identified, maintaining general privacy guidelines above the dissemination of publications. As for filters, publications are preceded by the widespread use of image modification tools. Finally, the answers show the influence of personal agents, mostly friends and brothers, and technology agents, which determine the relationship between the type of story and the network where it is published.
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Germán Carretero-Navarro Doménico Cherubini Wolfgang Taube 《European Journal of Sport Science》2019,19(5):595-602
Weighted vests are widely used to improve running economy and performance. However, it is not well-studied how running mechanics are adapted to counteract the higher peak vertical ground reaction forces (Fpeak) while running with such a device. Therefore, the present study aimed to investigate the effects of different loading conditions on running mechanics at different velocities. Thirteen subjects participated in two separate sessions one week apart. In the first session, maximal aerobic speed (MAS) was determined through a maximal incremental running test while in the second session, they were instructed to run during one minute under different loading (0%, +10% and +20% of body mass [BM]) and velocity (60%, 80% and 100% of MAS) conditions in a random order. Spatiotemporal data were recorded and then running mechanics modelled using the spring-mass model. The main results indicated that vertical and leg stiffness (Kvert and Kleg, respectively) were increased (P?P?>?.05) when load was changed. At the same time, alterations of the running kinematics were observed such as longer contact times, reduced flight times, stride frequencies and step lengths, as well as an increase of the centre of mass dynamics. Based on these results it is assumed that runners maintain a certain stiffness level for each velocity despite different loading conditions. As a consequence, Fpeak increases and this probably causes spatiotemporal adjustments in the movement kinematics. 相似文献
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M Martín-Matillas FB Ortega JR Ruiz D Martínez-Gómez G Vicente-Rodríguez A Marcos L Béghin A Kafatos M González-Gross M Zaccaria D Molnár S De Henauw M Sjöström LA Moreno MJ Castillo On Behalf Of The Helena Study 《Journal of sports sciences》2012,30(13):1329-1335
Abstract High physical fitness in childhood and adolescence is positively associated with favourable health-related outcomes. Our aim was to examine the relationship between relatives' (father, mother, brother, sister, and best friend) physical activity engagement and encouragement on adolescents' physical fitness. Adolescents were part of the HELENA study, a multi-centre study conducted in 10 cities from nine European countries in 2006-2008. Participants were 3288 adolescents (48% boys, 52% girls) aged 12.5-17.5 years with valid data on at least one of the three fitness variables studied: muscular strength (standing long jump), speed/agility (4×10 m shuttle run), and cardiorespiratory fitness (20 m shuttle run). The adolescents reported their relatives' physical activity engagement and encouragement. Analysis of covariance showed that relatives' physical activity engagement (father, mother, brother, and best friend) was positively related to cardiorespiratory fitness (P?相似文献
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This article studies a television market where operators can sell access to programs and to advertising time. First, we determine the retail prices paid by viewers and advertisers to a monopoly platform when there are externalities between these two markets. We compare the prices that an unregulated platform would establish with the welfare maximizing prices. Second, we obtain the access charge that an independent programmer should pay to a television platform for using one of his channels. We show that the optimal access charge takes into account the direct cost of access and the platform's opportunity costs in the viewer and advertiser markets, which are affected by the externalities between the two markets. 相似文献
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Rodríguez-Illera José Luis Barberà Gregori Elena Molas-Castells Núria 《Education and Information Technologies》2021,26(4):4093-4109
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Germà Coenders Willem E. Saris Joan M. Batista‐Foguet Anna Andreenkova 《Structural equation modeling》2013,20(2):135-157
In this article 2 major problems of using the three‐wave quasi simplex model to obtain reliability estimates are illustrated. The 1st problem is that the sampling variance of the reliability estimates can be very large, especially if the stability through time is low. The 2nd problem is that, for the reliability parameter to be identified, the model assumes a particular change process, namely a Markov process. We show that minor violations of this assumption can lead to a large bias in the reliability estimates. The problems are evaluated using both real and Monte Carlo data. A model with repeated measurements in 1 of the waves is also discussed. 相似文献
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Vanesa España Romero Jonatan R. Ruiz Francisco B. Ortega Enrique G. Artero Germán Vicente-Rodríguez Luis A. Moreno 《Journal of sports sciences》2013,31(5):469-477
Abstract The aim of this study was to compare equations for estimating percentage body fat from skinfold thickness in elite sport climbers by assessing their agreement with percentage body fat measured using dual-energy X-ray absorptiometry (DXA). Skinfold thickness was measured in a convenience sample of 19 elite sport climbers [9 women and 10 men; mean age 31.2 years (s = 5.0) and 28.6 years (s = 3.6), respectively]. Percentage body fat was estimated using 17 different equations, and it was also measured by DXA. A significant inter-methods difference was observed for all equations, except for Durnin's equation in men (inter-methods difference: ?0.57% and ?0.29%; 1.96 s: 5.56 and 5.23 for Siri's and Brozek's equation, respectively) and women (inter-methods difference: ?0.67% and ?1.29% for Siri's and Brozek's equation, respectively), and for Wilmore's equation using Siri's body fat equation in women (inter-methods difference: ?1.86%). In women, the limits of agreement were lower when using Durnin's equation compared with Wilmore's equation (1.96 s: 3.86% and 5.13%, respectively). In conclusion, of the 17 studied equations, Durnin's equation was the most accurate in estimating percentage body fat in both male and female elite climbers. Therefore, Durnin's equation could be used to assess percentage body fat in elite sport climbers if more accurate methods are not available. The generalizability of the results is limited by the fact that the sample was not selected at random. 相似文献
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