论老年人的健身运动

论述了老年人的生理特征,并介绍了适合老年人健身的项目和注意事项。     

浅谈美育在体育教学中的体现

美在运动中，运动中的美可以感召人，教育人。体育教学是复杂的认知系统，它不仅注重学生的形体活动，而且还讲究内在的精神、意识与形体、动作的密切配合，从以体育道德和理论为指导内容的各个训练环节中受到相应的教育。体育教师在教学过程中必须做到语言美、行为美，并给学生营造优美的教学氛围，有意识地培养和提高学生对美的感受力、鉴赏力和创造力，让学生在掌握技能、增强体质的同时，在运动中陶冶情操，优化品质，使学生得到全面发展。     

Equity in Spanish higher education

The most outstanding event in the recent evolution of higher education in developed countries has been the continuously increasing proportion of students entering higher education and, therefore, its extension to more and more inclusive groups. It seems reasonable to assume that the expansion of higher education must have facilitated access of less privileged social classes, but it is important to analyze to what extent this significant increase in higher education participation has reached all social, economic, and cultural groups. This analysis could be useful in designing a policy to help those students who have more difficulty accessing higher education. The goal in this paper is to analyze this subject thoroughly focusing especially on the level of participation of young adults in Spanish higher education controlling for economic level, parental education and occupation, and other environmental characteristics. We present a logistic model which jointly values the influence of different family and social characteristics of the individual on his/her decision to enroll in higher education. The main conclusions of the study are these: (a) There has been improvement in the equity of access to higher education. In spite of this overall improvement, about 30 per cent of the less privileged population is still underrepresented in higher education, (b) Family educational level is the most important factor in the decision to enter higher education. The weight of these educational characteristics exceeds by far the influence of family income level.     

Caffeine improves muscular performance in elite Brazilian Jiu-jitsu athletes

Scientific information about the effects of caffeine intake on combat sport performance is scarce and controversial. The aim of this study was to investigate the effectiveness of caffeine to improve Brazilian Jiu-jitsu (BJJ)-specific muscular performance. Fourteen male and elite BJJ athletes (29.2?±?3.3?years; 71.3?±?9.1?kg) participated in a randomized double-blind, placebo-controlled and crossover experiment. In two different sessions, BJJ athletes ingested 3?mg?kg^?1 of caffeine or a placebo. After 60?min, they performed a handgrip maximal force test, a countermovement jump, a maximal static lift test and bench-press tests consisting of one-repetition maximum, power-load, and repetitions to failure. In comparison to the placebo, the ingestion of the caffeine increased: hand grip force in both hands (50.9?±?2.9 vs. 53.3?±?3.1?kg; respectively p?p?=?.02), and time recorded in the maximal static lift test (54.4?±?13.4 vs. 59.2?±?11.9?s; p?p?=?.02), maximal power obtained during the power-load test (750.5?±?154.7 vs. 826.9?±?163.7?W; p?p?=?.04). In conclusion, the pre-exercise ingestion of 3?mg?kg^?1 of caffeine increased dynamic and isometric muscular force, power, and endurance strength in elite BJJ athletes. Thus, caffeine might be an effective ergogenic aid to improve physical performance in BJJ.     

抢后场篮板球及其第一传

论述抢后场篮板球及其快速准确的第一传,在篮球比赛中的作用,它们之间的关系及行之有效的几种训练方法。     

Promoting skilled problem-solving behavior among beginning physics students

Beginning physics students were constrained to analyze mechanics problems according to a hierarchical scheme that integrated concepts, principles, and procedures. After five 1-hour sessions students increased their reliance on the use of principles in categorizing problems according to similarity of solution and in writing qualitative explanations of physical situations. In contrast, no consistent shift toward these expert-like competencies was observed using control treatments in which subjects spent the same amount of time solving problems using traditional approaches. In addition, when successful at performing the qualitative analyses, novices showed significant improvements in problem-solving performance in comparison to novices who directed their own problem-solving activities. The implications of this research are discussed in terms of instructional strategies aimed at promoting a deeper understanding of physics.     

Student perceptions of the cell biology laboratory learning environment in four undergraduate science courses in Spain

Cell biology is an academic discipline that organises and coordinates the learning of the structure, function and molecular composition of cells in some undergraduate biomedical programs. Besides course content and teaching methodologies, the laboratory environment is considered a key element in the teaching of and learning of cell biology. The aim of this study was to determine students’ opinions about the quality of the teaching and learning environment in cell biology laboratory practice. For this study, we used a short form of the Science Laboratory Environment Inventory (SLEI), which we adapted and translated into Spanish. The questionnaire, administered to students enrolled in four undergraduate programs, consisted of 24 questions divided into four scales: integration of content, clarity of laboratory rules, cohesion between students and teachers, and quality of laboratory infrastructures and materials. The results suggested that (1) students positively assessed the learning environment provided for cell biology practice, (2) the short Spanish form of the SLEI was a valid, reliable instrument for evaluating student satisfaction, laboratory activities, the degree of cooperation between students and teachers, and theoretical and practical organisation of content and (3) the questionnaire detected differential perceptions of the learning environment based on gender and the program studied.     

Studying studies on teacher reflection and action: An appraisal of research contributions

For decades a substantial body of research on teacher reflection and action has been conducted. This research contains a wealth of information on teachers’ thinking about their daily work in classrooms. But what do these studies tell us about the linkage between thought and action in actual teaching? How do they contribute to our understanding, or do they, in the very selection of their methods, ‘tell only half the story’? To address these concerns, we have engaged in a critical appraisal to learn about the scope and limitations of research contributions and identify criteria that may shed light on exactly what aspects of teacher learning and development are being studied.This appraisal uses an analytic framework to position the various studies that have been conducted. From our analysis, which focuses on the validity criterion of closeness between type of research question and data collection methods, we conclude that the research would profit from a set of more detailed criteria to address some of the limitations inherent in approaches to studying teacher reflection and action.     

The moral dimension in Chilean higher education’s expansion

Chilean higher education has expanded greatly in recent decades, primarily through drawing on the private contributions of students and families, and an increased number and variety of institutions. In the context of attempts to address criticism that the sector is not free, public or high-quality enough, this article examines the association between education and its moral and ethical dimensions, and their separate yet complementary consideration alongside economic development, through the two centuries of the Chilean state’s existence. Since the beginning of the current decade, discontent with the framing and performance of higher education as a whole has grown. The overview traces this process not as fresh crisis, but part of a social question pondered repeatedly in the past and supported with varying success through educational and political initiatives. This historical (and historiographic) approach illuminates the limits of conceiving of higher education as either an economic good or as a human right, and an overlooked need to support its benefits through policy. Not simply an interpenetration with economic thinking, but also a lack of sufficient appreciation of Chile’s fundamental and singular character, present as challenges in understanding expanded access’s function and its prospective contribution to growing debates around ethics and inequality.     

Supplementation with turmeric residue increased survival of the Chinese soft-shelled turtle (<Emphasis Type="Italic">Pelodiscus sinensis</Emphasis>) under high ambient temperatures

Turmeric residue (TR), containing residual levels of curcumin, is a solid by-product waste generated after the extraction and separation of curcumin from turmeric root. A feeding trial was conducted to evaluate the effects of TR on the survival of Chinese soft-shelled turtles (SSTs), Pelodiscus sinensis, under a high ambient temperature. A total of 320 female SSTs were assigned randomly to two diets: basal diet (the control group, n=160) and an interventional diet supplemented with 10% TR (the TR group, n=160). Our results demonstrated that supplementation of TR increased the SST survival rate by 135.5%, and superoxide dismutase (SOD) activity of SST liver by 112.8%, and decreased the malondialdehyde (MDA) content of SST liver by 36.4%, compared to the control group. The skin of the SST fed TR showed a golden color. High-performance liquid chromatography (HPLC) analysis indicated that the concentrations of curcumin in TR and the skin of the SST fed TR were (1.69±0.30) and (0.14±0.03) μg/g, respectively. Our observation suggests that supplementation of TR increased the survival rate of SST under high ambient temperatures. We speculated that the increased survival rate and tolerance at the high ambient temperature were associated with the anti-oxidation activity of curcumin from TR. Moreover, curcumin in TR could be deposited in SST skin, which made it more favored in the market of China. Our findings provide new knowledge and evidence to effectively reuse TR as a feed additive in animal and aquatic farming.