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排序方式： 共有140条查询结果，搜索用时 15 毫秒
81.
Jiří Baláš David Giles Leona Chrastinová Kateřina Kárníková Jan Kodejška Alžběta Hlaváčková 《Journal of sports sciences》2017,35(10):989-994
The aim of this study was to examine the effect of alterations in potential lead fall distance on the hormonal responses of rock climbers. Nine advanced female climbers completed two routes while clipping all (PRO-all) or half (PRO-½) of the fixed points of protection. Venous blood samples were analysed for total catecholamines, noradrenaline (norepinephrine), adrenaline (epinephrine), dopamine, lactate, cortisol and serotonin. Differences between the two conditions pre, immediately post and 15 min post climbing were assessed using a 2 × 3 repeated measures ANOVA. All hormones and blood lactate concentrations increased significantly (P < 0.05) immediately post climb, except for cortisol. Peak cortisol concentrations did not occur until 15 min post ascent. Further, significant interactions between climbing and clipping conditions were found for total catecholamines (890% of basal concentration in PRO-½ vs. 568% in PRO-all), noradrenaline (794% vs. 532%) and dopamine (500% vs. 210%). There were no significant interactions for adrenaline (1920% vs. 1045%), serotonin (150% vs. 127%) or lactate (329% vs. 279%). The study showed a greater catecholamine response with an increase in potential lead fall distance. The most pronounced increases seen in catecholamine concentration were reported for dopamine and noradrenaline. 相似文献
82.
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
83.
In this paper we study the problem of classification of textual web reports. We are specifically focused on situations in which structured information extracted from the reports is used for classification. We present an experimental classification system based on usage of third party linguistic analyzers, our previous work on web information extraction, and fuzzy inductive logic programming (fuzzy ILP). A detailed study of the so-called ‘Fuzzy ILP Classifier’ is the main contribution of the paper. The study includes formal models, prototype implementation, extensive evaluation experiments and comparison of the classifier with other alternatives like decision trees, support vector machines, neural networks, etc. 相似文献
84.
This article examines the effects of social capital on the likelihood of dropping out from the compulsory education system (Grades One through Eight) in Turkey. It focuses on the question of whether school-related social capital can provide the means to stay in school in the presence of risk factors such as socioeconomic status, race, or gender that cannot be easily modified. Despite major progress in enrollment rates due to policies enacted in recent years, the overall drop-out rate in compulsory education is close to 15% in Turkey. Data collected from 764 student–mother pairs show that drop-outs are exposed to higher number of social risk factors. We further illustrate that school-related social capital, as measured by quality of in-school teacher–student interactions as well as parental involvement in school, significantly and positively contributes to adolescents’ likelihood of staying in school even in the presence of severe social inequalities. 相似文献
85.
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87.
Nejla Yürük 《Journal of Science Education and Technology》2007,16(6):515-523
The aim of this study was to investigate the effectiveness of instruction supplemented by conceptual change texts (CCTs) over
traditional instruction on students’ understanding of electrochemical (galvanic and electrolytic) cell concepts. The participants
of the study consisted of 64 students from the two classes of a high school located in Turkey. Classes were randomly assigned
to experimental group, which was exposed to CCTs as a supplementary material, and to control group, which was exposed to traditional
instruction. A 23-item multiple-choice test was developed assess students’ conceptual understanding of electrochemical cells.
This test was administered to both groups before and after the instruction. The results of ANCOVA indicated that students
who were instructed by using CCTs had better conceptual understanding of electrochemical cells than those experiencing traditional
instruction when their prior electrochemical cell concepts understanding was statistically controlled. The findings of this
study suggest that CCTs can be used as a cost- and resource-effective supplement to classroom instruction to promote students’
understanding science concepts. 相似文献
88.
This article focuses on parents’ construction of and emotions in their everyday lives. The study brings into focus the meanings in the foreground of everyday life, while also revealing new insights into cultural beliefs and prejudices. Interviews were conducted with five nuclear and four divorced families, and each participant (N?=?18) was interviewed twice. The second interview was a photo-narrative interview, for which each participant took photographs pertaining to their daily life. Content and thematic analysis were applied to the data. Three main categories of everyday life emerged from the data: family daily life, couples’ daily life, and one’s own daily life. The importance of and pleasure derived from one’s own daily life were emphasized as the foundation of well-being for both the individual and the whole family. 相似文献
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90.