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排序方式： 共有343条查询结果，搜索用时 15 毫秒
241.
Mark Evans Ella Patchett Rickard Nally Rachel Kearns Matthew Larney 《European Journal of Sport Science》2018,18(3):376-386
Acute ingestion of ketone salts induces nutritional ketosis by elevating β-hydroxybutyrate (βHB), but few studies have examined the metabolic effects of ingestion prior to exercise. Nineteen trained cyclists (12 male, 7 female) undertook graded exercise (8 min each at ～30%, 40%, 50%, 60%, 70%, and 80% VO2peak) on a cycle ergometer on two occasions separated by either 7 or 14 days. Trials included ingestion of boluses of either (i) plain water (3.8?mL?kg?body mass?1) (CON) or (ii) βHB salts (0.38?g?kg?body mass?1) in plain water (3.8?mL?kg body mass?1) (KET), at both 60 min and 15 min prior to exercise. During KET, plasma [βHB] increased to 0.33?±?0.16?mM prior to exercise and 0.44?±?0.15?mM at the end of exercise (both p?.05). Plasma glucose was 0.44?±?0.27?mM lower (p?.01) 30?min after ingestion of KET and remained ～0.2?mM lower throughout exercise compared to CON (p?.001). Respiratory exchange ratio (RER) was higher during KET compared to CON (p?.001) and 0.03–0.04 higher from 30%VO2peak to 60%VO2peak (all p?.05). No differences in plasma lactate, rate of perceived exertion, or gross or delta efficiency were observed between trials. Gastrointestinal symptoms were reported in 13 out of 19 participants during KET. Acute ingestion of βHB salts induces nutritional ketosis and alters the metabolic response to exercise in trained cyclists. Elevated RER during KET may be indicative of increased ketone body oxidation during exercise, but at the plasma βHB concentrations achieved, ingestion of βHB salts does not affect lactate appearance, perceived exertion, or muscular efficiency. 相似文献
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This study uses a continuum to exemplify the range of interruptions experienced by teachers in junior schools. Further clarification is supplied by the matrix, showing sources and types of interruptions.
Reasons for the transformation of ‘interruptions’ into ‘disruptions’ are also discussed, substantiated where possible by selection from the available literature. Further illustrative material is taken from interviews with 12 head teachers and 13 class teachers. Non‐participant observations of 16 of these teachers, working in 11 schools, over a period of six months, provide the data about actual interruptions.
Analyses of these data provide information about the types and frequency of interruptions and evidence of how teachers manage them. Teachers’ ‘coping strategies’ are thus identified and ways of minimising interruptions are examined. The differences between ‘proactive’ and ‘reactive’ class management are considered and the effects of both upon teachers’ effectiveness is debated. 相似文献
249.
Tarah Hodgkinson Hugh Curtis David MacAlister Graham Farrell 《Journal of Criminal Justice Education》2016,27(1):1-18
Approximately one-half to three-quarters of university students commit some form of cheating, plagiarism, or collusion. Typical university responses are policy statements containing definitions plus punishment procedures. This paper collates a portfolio of strategies and tactics that seek to design-out, deter, and discourage academic misconduct. It finds many routine tactics exist, from silence and the use of large halls for major exams, to restrictions on electronic devices. Others are less consistently adopted, such as splitting lengthy exams in two to discourage washroom-visits where cheating takes place. The portfolio of tactics is framed in the context of crime opportunity theory and the 25 techniques of situational crime prevention. It is proposed that more consistent application of tactics focusing on environmental design, curricular design, and class management offer significant potential for reducing misconduct. Future research should seek to evaluate and enhance such interventions. 相似文献
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