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201.
The purpose of this study was to verify the association between ACTN3 polymorphism and physiological parameters related to endurance performance. A total of 150 healthy male volunteers performed a maximal incremental running test to determine the speeds corresponding to ventilatory threshold (VT) and respiratory compensation point (RCP). Participants were genotyped and divided into terciles based on the analysed variables. Genotype frequencies were compared through χ2 test between lower and higher terciles, with the lowest or highest values of each analysed variable. ACTN3 XX genotype was over-represented in higher tercile for VT and RCP. Odds ratio also showed significantly higher chances of XX individuals to be in higher tercile compared to RR (7.3) and RR + RX (3.5) for VT and compared to RR genotype (8.1) and RR + RX (3.4) for RCP. Thus, XX individuals could attain the VT and RCP at higher speeds, suggesting that they are able to sustain higher running speeds in lower exercise intensity domains. It could result in higher lipid acids oxidation, saving muscle glycogen and delaying the fatigue during prolonged exercises, which could be the advantage mechanism of this genotype to endurance performance.  相似文献   
202.
Gaelic Football and Hurling are two sporting codes within the Gaelic Athletic Association. The purpose of this study was to report the body composition phenotype of inter-county Gaelic athletic association players, comparing groups by code and field position. 190 senior, male, outfield inter-county players (144 hurlers and 46 Gaelic footballers) were recruited. Stature and body mass was measured, estimates of three components of body composition, i.e. lean mass, fat mass and bone mineral content was obtained by dual energy X-ray absorptiometry (DXA), and normative data for Gaelic athletic association athletes by code and position was compared. Other than in the midfield, there was limited difference in body composition between codes or playing position. Stature-corrected indices nullified any existing group differences between midfielders for both codes. Further comparisons with a non-athletic control group (n = 431) showed no difference for body mass index (BMI); however, the athletic group has a lower fat mass index, with a greater lean mass in accounting for the matched BMI between groups. In addition to providing previously unknown normative data for the Gaelic athletic association athlete, a proportional and independent tissue evaluation of body composition is given.  相似文献   
203.
The aim of this study was to investigate the effect of playing surface on physiological and performance responses during and in the 48 h after simulated soccer match play. Blood lactate, single-sprint, repeated-sprint and agility of eight amateur soccer players were assessed throughout a 90-min soccer-simulation protocol (SSP) completed on natural turf (NT) and artificial turf. Counter-movement jump, multiple-rebound jump, sprint (10 m, 60 m), L-agility run (L-AR), creatine kinase (CK) and perception of muscle soreness (PMS) were measured before, immediately after, 24 h and 48 h after exercise. Analyses revealed significant changes in blood lactate and single-sprint performance (both P < 0.05) during the SSP but with no significant differences between surfaces. Conversely, repeated-sprint performance demonstrated an interaction effect, with reductions in performance evident on NT only (P < 0.05). Whilst L-AR and 10-m sprint performance remained unchanged, 60-m sprint and multiple-rebound jump performance were impaired, and PMS and CK were elevated immediately following the SSP (all P < 0.05) but with no surface effects. Although performance, CK and PMS were negatively affected to some degree in the 48 h after the SSP, there was no surface effect. For the artificial and natural surfaces used in the present study, physiological and performance responses to simulated soccer match play appear to be similar. Whilst a potential for small differences in performance response exists during activity, surface type does not affect the pattern of recovery following simulated match play.  相似文献   
204.
This paper reports our experiences in working with precollege and undergraduate American Indian students. In 1990, we began a fourth-grade after-school science program for 30 American Indian students. At the present time the program, called Scientific Knowledge for Indian Learning and Leadership (SKILL), involves over 200 American Indian 4th-9th grade students in weekly science/mathematics activities, quarterly Saturday seminars, and summer science camps. We have collected data to try to determine factors that help to improve student attitudes towards mathematics and science. Conclusions are drawn from these analyses and from our own subjective observations. The development of American Indian involvement in undergraduate science and engineering education on our campus has been aided by the establishment of an American Indian Science and Engineering Society (AISES) chapter and also by the promotion of collaborative learning. A comparison of our observations in the framework of other more well-established programs is given. Changes that have occurred as a result of both precollege and college activities are described and discussed. It appears that each of these activities has had beneficial influences on the other. We also report problems and concerns as well as recommendations to other groups or institutions who may be embarking on similar endeavors.  相似文献   
205.
206.
This paper provides a comparative account of two conceptualisations of pleasure. The first draws on Foucault’s analysis of bio‐power. The second provides a phenomenological account where pleasure is viewed as an aspect of our immediate consciousness. These conceptualisations are illuminated through an analysis of employees’ accounts of learning at work. Overall, the paper demonstrates how, in a Foucauldian analysis, pleasure disappears as it becomes a cipher for power whereas within the phenomenological account pleasure is foregrounded but power disappears. The concluding section focuses on the problems of both conceptualisations and explores whether we should simply accept that different analytical frameworks do different work for us or whether we should be more concerned at the losses, and gains, associated with theoretical choices. The conclusion further asks whether a concern to foreground pleasure in accounts of learning represents an antidote to the pessimism of much critical analysis or whether we should treat pleasure as a morally duplicitous category that encourages political apathy.  相似文献   
207.
A good deal of research has been published concerning the effects of orienting activities on learning. Orienting activities include advance organizers, embedded pre-questions, behavioral objectives, as well as other strategies designed to prepare the learner for instruction. This paper focuses on the presumed functions of orienting activities and the implications of such functions for the design of computer-based interactive video. In addition, the application of empiricallyfounded principles in the design and production of computer-based interactive video is described.Grumman Aerospace Corporation  相似文献   
208.
Welfare workers face complex problems which emerge in social interaction. Rationalist structured approaches in problem based curricula fail to prepare students to work with unstructured complexity in stressful contexts. The social construction of an extended simulation by students and staff is described. Students, staff and organizations play roles in a simulated city, and students experience complex problems as they emerge in social interaction. Processing completes the experiential cycle. Evaluation to date indicates the activity has learning value.  相似文献   
209.
The practicum constitutes an integral part of many professional courses in higher education; and is manifest in several different forms depending on the discipline: field experience, cooperative education, sandwich programs, internships, clerkships, clinical practicum, and the like. This paper provides an overview of different ways in which the practicum has been conceptualised, implemented and evaluated in higher education. It focuses attention on the purpose and value of the practicum; the relationship between the practicum and the learning outcomes of a course as a whole; and the structure and placement of the practicum within a course. Findings indicate that whilst the practicum is widely accepted as a valuable and successful component of professional education, it has a number of shortcomings; and the lack of good quality research into the practicum makes it difficult to draw unequivocal conclusions. A number of questions are posed to guide further research into the role of supervision during practicum placements; the kinds of learning goals and outcomes that are best achieved through the practicum; and the impact on student learning of the length and structure of the practicum.  相似文献   
210.
ABSTRACT

Early career academics (ECAs) represent the future of the academic workforce, but competition and career uncertainty is resulting in disengagement and burnout. In professions outside academia, increased engagement is associated with perceived organisational support and fair recognition and rewards, as well as opportunities to meet basic psychological needs of autonomy, competence and relatedness. In contrast, decreased engagement is linked with increasing demands on effort and over-commitment to work. The current study used multiple linear regression to test whether comparable relationships were observed in a sample of 151 ECAs in an Australian university. Opportunities to build and demonstrate competence at work, the presence of meaningful relationships and perceived organisational support were independent and statistically significant predictors of engagement. The need for autonomy and fair rewards and recognition appeared to be correlated but not statistically significant predictors of engagement. Contrary to prediction, increasing effort and over-commitment to work did not predict decreases in engagement. These results are discussed in light of implications for programs designed to support the development of ECAs into various career pathways.  相似文献   
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