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991.
This study employed ordinal logistic regression analyses to investigate the relationship between American adolescents' participation in physical activity and depressive symptomatology. Data were drawn from the second Child Development Supplement to the Panel Study of Income Dynamics (CDS II), which was conducted over 2002-2003. Fewer than 60% of adolescents were found to accumulate 60 min of moderate-to-vigorous physical activity (MVPA) outside of school hours on week or weekend days. Accumulated duration of MVPA was not, however, significantly associated with severity of depressive symptoms for either gender. Males who were not involved in sporting clubs or lessons were more likely than males who were highly involved to experience greater severity of depressive symptoms (OR = 3.24, CI = 1.33, 7.87). Results highlight gender variability in the psychosocial correlates of sporting participation and prompt further investigation of the relevance of current physical activity guidelines for mental health in adolescence. 相似文献
992.
993.
AbstractIn policy contexts, social exclusion can be experienced through the systematic marginalization of groups by inhibiting their ability to access resources and support. In this article, we consider the context of community sport development in rural Canada to discuss the implications of rationalized policy systems for rural citizens. We discuss instances where engagement with the sport system was constrained as well as the way that rural people responded in order to continue engagement in sport both within and outside of policy frameworks. A more inclusive sport policy system requires the acknowledgement of diverse social outcomes which may be realized through sport. But, in order for this to take place, policy makers and practitioners must acknowledge that these outcomes can exist outside of athlete development and must re-consider the ways that resources and support can be allocated. 相似文献
994.
Laura Simoni Guido Pasquini Silvia Pancani Federica Vannetti Claudio Macchi Silvia Pogliaghi 《Journal of sports sciences》2020,38(20):2321-2328
ABSTRACT Studies on running biomechanics and energetics are usually conducted on a treadmill. To ensure that locomotion on a treadmill is comparable to locomotion overground, participants need to be expert in the use of the device. This study aimed to identify the number and duration of sessions needed to obtain stable measurements for spatiotemporal and metabolic parameters in unexperienced treadmill runners. Fourteen male recreational runners performed three 15-min treadmill running trials in different days at a submaximal speed. Spatiotemporal and metabolic parameters were registered at minutes: 5, 10, 15 and their within-trial and between-trial changes were analysed using a two-way repeated measures ANOVA and Bonferroni post-hoc test. Within-trial differences were found in step frequency (decreased over time), Step Length and Contact Time (increased), reaching stability at different time points. Ventilator parameters increased, reaching stability after 5–10 min, while heart rate increased progressively over time. The only between-trial differences were an increase in step length and a decrease in step frequency at min 1, between trials 1 and 3. In conclusion, at least three running trials of 15 min are required to familiarize with the device. The last 5 min of the third trial can be regarded as stable measurements. 相似文献
995.
Emil List Larsen Henrik Enghusen Poulsen Cristina Michaelsen Laura Kofoed Kjær Mark Lyngbæk Emilie Skytte Andersen 《Journal of sports sciences》2020,38(18):2080-2091
ABSTRACT
Acute and adaptive changes in systemic markers of oxidatively generated nucleic acid modifications (i.e., 8-oxo-7,8-dihydro-2?-deoxyguanosine (8-oxodG) and 8-oxo-7,8-dihydroguanosine (8-oxoGuo)) as well as inflammatory cytokines (i.e., C-reactive protein, interleukin-6, interleukin-10, and tumour necrosis factor alpha), a liver hormone (i.e., fibroblast growth factor 21 (FGF21)), and bone metabolism markers (sclerostin, osteocalcin, C-terminal telopeptide, and N-terminal propeptide of type 1 procollagen) were investigated following a marathon in 20 study participants. Immediate changes were observed in inflammatory cytokines, FGF21, and bone metabolism markers following the marathon. In contrast, no immediate changes in urinary excretion of 8-oxodG and 8-oxoGuo were evident. Four days after the marathon, decreased urinary excretion of 8-oxodG (-2.9 (95% CI -4.8;-1.1) nmol/24 h, P < 0.01) and 8-oxoGuo (-5.8 (95% CI -10.3;-1.3) nmol/24 h, P = 0.02) was observed. The excretion rate of 8-oxodG remained decreased 7 days after the marathon compared to baseline (-2.3 (95%CI -4.3;-0.4) nmol/24 h, P = 0.02), whereas the excretion rate of 8-oxoGuo was normalized. In conclusion marathon participation immediately induced a considerable inflammatory response, but did not increase excretion rates of oxidatively generated nucleic acid modifications. In fact, a delayed decrease in oxidatively generated nucleic acid modifications was observed suggesting adaptive antioxidative effects following exercise. 相似文献
996.
There is much interest in comparing latent traits, such as teacher job satisfaction, in large international surveys. However, different countries respond to questionnaires in different languages and interpret the questions through different cultural lenses, raising doubts about the psychometric equivalence of the measurements. Making valid comparisons depends on the latent traits displaying scalar measurement invariance. Unfortunately, this condition is rarely met across many countries at once. Different approaches that maximize the utility of such surveys, but remain faithful to the principles of measurement invariance testing, are therefore needed. This article illustrates one such approach, involving multiple‐pairwise comparisons. This enables us to compare teacher job satisfaction in England to 17 of the countries that participated in TALIS 2013. Teacher job satisfaction in England was as low, or lower, than all of the 17 comparable countries. 相似文献
997.
998.
Laura Crane Jade Davies Anne Fritz Sarah O’Brien Alison Worsley Maria Ashworth Anna Remington 《British Journal of Special Education》2021,48(3):323-346
Education professionals (n = 41) in special schools were interviewed about supporting their autistic pupils transitioning to adulthood following the introduction of the Children and Families Act 2014. Our participants explained how they lacked the time to fully implement knowledge gained from training, leading to growing reliance on experiential expertise. While our participants reported employing a variety of methods to elicit the voices of pupils, they were uncertain how effective and ethical these were. Further, a lack of available opportunities meant that participants felt they could not always support young people in achieving their goals. Based on these findings, we recommend greater investment in the implementation of staff training, more flexibility for schools to be able to meaningfully elicit and act on pupils' voices, and better vocational opportunities for autistic young people with additional learning needs. This would enable the principles of the Act, which have been widely lauded, to become a closer reality. 相似文献
999.
The development of language attitudes and perception of talker regional background was investigated across the life span (N = 240, age range = 4–75 years). Participants rated 12 talkers on dimensions of geographic locality, status, and solidarity. Children could classify some dialects by locality by age 6–7 years and showed adult-like patterns by age 8 years. Children showed adult-like status ratings for some dialects by age 4–5 years but were not fully adult-like until age 12 years. Solidarity ratings were more variable and did not exhibit a clear developmental trajectory, although some adult-like patterns were in place by age 6–7 years. Locality ratings were a significant but modest predictor of attitude ratings, suggesting that geographic knowledge is one contributor to language attitudes throughout development. 相似文献
1000.
Laura Elenbaas 《Child development》2019,90(1):108-116
This study examined young children's contact with individuals of high-wealth and low-wealth backgrounds and their behavior toward peers of these backgrounds in a resource distribution task. The sample included 72 ethnically diverse higher income children (Mage = 6.68 years, SD = 0.98 years). Contact with individuals of low-wealth backgrounds (interwealth contact) affected children's behavior indirectly, through social-cognitive reasoning processes. The more interwealth contact children reported, the more likely they were to reason about access to resources rather than their own wealth preferences in this context. This reasoning, in turn, was associated with more resources allocated to a low-wealth peer relative to a high-wealth peer. Thus, interwealth contact early in development was associated with more equitable peer interactions. 相似文献