Immune nutrition and exercise: Narrative review and practical recommendations

Abstract

Evidence suggests that periods of heavy intense training can result in impaired immune cell function, and whether this leaves elite athletes at greater risk of infections and upper respiratory symptoms (URS) is still debated. There is some evidence that episodes of URS do cluster around important periods of competition and intense periods of training. Since reducing URS, primarily from an infectious origin, may have implications for performance, a large amount of research has focused on nutritional strategies to improve immune function at rest and in response to exercise. Although there is some convincing evidence that meeting requirements of high intakes in carbohydrate and protein and avoiding deficiencies in nutrients such as vitamin D and antioxidants is integral for optimal immune health, well-powered randomised controlled trials reporting improvements in URS beyond such intakes are lacking. Consequently, there is a need to first understand whether the nutritional practices adopted by elite athletes increases their risk of URS. Second, promising evidence in support of efficacy and mechanisms of immune-enhancing nutritional supplements (probiotics, bovine colostrum) on URS needs to be followed up with more randomised controlled trials in elite athletes with sufficient participant numbers and rigorous procedures with clinically relevant outcome measures of immunity.     

Improving Oral Communication Skills of Students in Food Science Courses

ABSTRACT: Communication activities about food evaluation were incorporated into food preparation courses. Oral reports replaced quizzes and an oral presentation replaced the final exam. A rubric was developed to help students evaluate ingredient functions, procedures, techniques, temperatures, and sensory evaluation. Oral report scores, self-evaluations, course evaluations, final grades, and the instructors' observations were used to evaluate the effectiveness of the communication activities. Students learned professional language and practiced professional behaviors. These types of practice opportunities are critical to students' development and important for the food science profession.     

‘Doing for group exercise what McDonald's did for hamburgers’: Les Mills,and the fitness professional as global traveller

This article analyses fitness professionals' perceptions and understanding of their occupational education and pedagogical pursuance, framed within the emergence of a global fitness industry. The empirical material consists of interviews with personal trainers and group fitness instructors, as well as observations in their working environment. In addition, printed material from different occupational organisations and educational companies has been included. The narratives of the fitness professionals and a case study of Les Mills are presented and analysed through the concept of the McDonaldisation of society, or more specifically of fitness culture. The results show that, even though gym and fitness franchises differ from hamburger restaurant chains, there are crucial similarities, but also differences. One can, for example, discern a tendency towards the construction of predesigned and highly monitored programmes, such as the one developed by Les Mills. Homogenisation is also apparent when looking at the body ideals produced, as fitness professionals work on their own or clients' bodies, which makes it possible to anticipate a global body ideal. The social and cultural patterns of self-regulation and self-government found in gym and fitness culture can be understood and analysed in a global context. What we find is an intriguing and complex mixture of regulation, control and standardisation, on the one hand, and a struggle to express the body, to be ‘free’ and to transgress the boundaries set by the commercial global fitness industry, on the other.     

Towards Eco-reflexive Science Education

The modern world can be described as a globalized risk society. It is characterized by increasing complexity, unpredictable consequences of techno-scientific innovations and production, and its environmental consequences. Therefore, chemistry, just like many other knowledge areas, is in an ongoing process of environmentalization. For example, green chemistry has emerged as a new chemical metadiscipline and movement. The philosophy of green chemistry was originally based on a suggestion of twelve principles for environment-friendly chemistry research and production. The present article problematizes limitations in green chemistry when it comes to education. It argues that the philosophy of green chemistry in the context of education needs to be extended with socio-critical perspectives to form educated professionals and citizens who are able to understand the complexity of the world, to make value-based decisions, and to become able to engage more thoroughly in democratic decision-making on sustainability issues. Different versions of sustainability-oriented science/chemistry education are discussed to sharpen a focus on the most complex type, which is Bildung-oriented, focusing emancipation and leading to eco-reflexive education. The term eco-reflexive is used for a problematizing stance towards the modern risk society, an understanding of the complexity of life and society and their interactions, and a responsibility for individual and collective actions towards socio-ecojustice and global sustainability. The philosophical foundation and characteristics of eco-reflexive science education are sketched on in the article.     

Social life for sale! A critical discourse analysis of the concept of student life on Danish university websites

This paper aims to investigate the marketization of higher education (HE) as it manifests itself in the concept of Student life on Danish HE websites. Taking Norman Fairclough’s critical discourse analysis as its starting point, this paper critically examines this particular practice of marketization by making a single-case study of the pages called Student life at the biggest university in Denmark, Copenhagen University (CU). The findings show that these page elements of social life are intensively and routinely used to soften up the more demanding aspects of being a university student, and that this involves a significant positive evaluation of life as a university student. The paper addresses the potential problems related to the findings in order to contribute to further discussion and reflection upon issues centred around the marketization of HE on university websites and around the construction of what it means to be a student today.     

Conceptual Blending as an Interpretive Lens for Student Engagement with Technology: Exploring Celestial Motion on an Interactive Whiteboard

Research in Science Education - We present and analyze video data of upper secondary school students’ engagement with a computer-supported collaborative learning environment that enables them...     

Activity profile and physical demands of football referees and assistant referees in international games

Abstract

Time-motion analyses and physiological measurements were performed to investigate the physiological demands of football referees (n = 15) and assistant referees (n = 15) in international games and to examine whether high-intensity running (HIR) correlates to the referees' ability to keep up with play. Total distance covered (10.27 ± 0.90 vs. 6.76 ± 0.83 km) and HIR (1.92 ± 0.58 vs. 0.97 ± 0.22 km) was higher (P < 0.05) for referees than assistant referees, while sprinting distance was not different. Referees covered 0.89 ± 0.37 km by backwards running and assistant referees covered 1.54 ± 0.66 km by sideways running. Mean heart rate was higher (P < 0.05) for referees than assistant referees (150 ± 3 vs. 123 ± 3 b.p.m.), whereas blood lactate was not different. Backwards/sideways running decreased (P < 0.05) from the first to the last 15-min period for referees (49%) and assistant referees (42%), whereas HIR was unaltered. HIR was inversely correlated with the five highest distances from infringements in both halves (r = ?0.60 and ?0.58, P < 0.05). In conclusion, international match officials carry out an important amount of HIR throughout games, while low-intensity and unorthodox running activities are reduced during games. Referees performing the most high-intensity work are better to keep up with play. The match activities differ significantly between referees and assistant referees, which should be considered in training and testing procedures.