Mechanical properties of the triceps surae: Differences between football and non-football players

Abstract

We investigated the mechanical properties of the triceps surae between professional, junior, and non-football players. Fifty-nine men participated in this study. The mechanical properties of the right legs’ triceps surae were measured in vivo using a free oscillation technique; no significant differences existed between the groups. The mean results for musculo-articular stiffness, damping coefficient, and damping ratio were as follows: professional football players (21523 N· m^?1, 330.8 N · s · m^?1, and 0.201); junior football players (21063 N · m^?1, 274.4 N · s · m^?1, and 0.173); and non-players (19457 N · m^?1, 281.5 N · s · m^?1, and 0.184). When analysed according to position, the results were as follows: defender (21447 N · m^?1, 308.6 N · s · m^?1, and 0.189); midfielder (20762 N · m^?1, 250.7 N · s · m^?1, and 0.157); winger (21322 N · m^?1, 335.1 N · s · m^?1, and 0.212); forward (22085 N · m^?1, 416.2 N · s · m^?1, and 0.254); and non-players (19457 N · m^?1, 281.5 N · s · m^?1, and 0.184).

Thus, football training, football games, and the position played had no effect on triceps surae mechanical properties. These results may be attributed to opposing adaptations between different types of training that are usually implemented in football. Alternatively, the minimum strain amplitude and/or frequency threshold of the triceps surae required to trigger adaptations of mechanical properties might not be achieved by football players with football training and matches.     

Negotiating the role of sources: Educators' conceptions of credibility in participatory media

Participatory media are commonly used in today's society for a variety of purposes. The credibility associated with these media is sometimes contested, and their acceptance into school practices has been debated. Focus group interviews with teachers and librarians in upper secondary schools in Sweden are used to investigate conceptions and experiences of activities involving the critical evaluation of participatory media, with a particular focus on Wikipedia. Three themes are addressed. The first concerns how the teaching of the critical evaluation of sources is organized and comanaged between teachers and librarians. The second describes educators' experiences of print versus digital media, and their worry because students have problems negotiating the information architecture of print media. The third theme deals with conceptions of the credibility of Wikipedia. Four conceptions of credibility are identified: credibility is associated with the control and stability of a source; it is considered to be strengthened when several sources support a claim; it is viewed as situational and partial, rather than absolute; and it is associated with a multiplicity of voices and democratic forms of production. These findings may be used to inform educational activities around credibility and authority in schools by raising self-awareness among educators of various ways to talk about the credibility of sources with both colleagues and students.     

Higher growth through the Blue Ocean Strategy: Implications for economic policy

Higher growth is a key goal of companies, governments, and societies. Economic policies often attempt to attain this goal by targeting companies of certain sizes that operate in specific industries and focus on a specific business activity. This approach to policy making has considerable shortcomings and seems to be less than fully effective in increasing economic growth. We suggest a new approach to policy making that stems directly from the entrepreneurial perspective. This approach examines a successful business strategy framework - the Blue Ocean Strategy - to discover conditions for high growth. We test the propositions on empirical data for two cases of successful high-growth business, namely Slovenian gazelles and Amazon.com. The results reveal a gap between the macro level of economic policy making to achieve higher growth and the micro level of business growth. The findings call for a change in the focus of economic policies on specific size companies, industries, and business activities to intraindustry cooperation, collaboration between companies of different sizes, value innovation, and creation of uncontested markets.     

Parent-child communication as a function of parental education,sex of parent and child and situational factors

Parent-child communication was studied in different contexts (home vs laboratory, variation between and within the tasks, dyad vs triad). The subjects were 48 Finnish families with a four-year-old child. The families were divided into euqual groups of lower and higher parental education. The experiments were carried out in two stages: the first in the laboratory setting and the second in the laboratory setting or at home. The videotaped situations consisted of different cooperative tasks. The first result based on global ratings of dyads and triads (initiation/guidance, cooperation, emotionality) and on evaluation of parents’ teaching styles showed only minor differences in interactional measures, whereas the higher education parents used more mentally demanding teaching styles than the lower education parents. In addition, the particular nature of the tasks and the phase of the task was found to be essential to the forms of interaction.     

Community Relationships and the Practice of Public Relations in Higher Education

Tertiary Education and Management - In 2004 the Finnish Universities Act was amended to include a third strand as an essential part of research and teaching. This paper focuses on relationship...     

Does money matter for schools?

There is considerable disagreement in the academic literature about whether raising school expenditure improves educational outcomes. Yet changing the level of resources is one of the key policy levers open to governments. In England, school expenditure has increased by about 40% since 2000. Thus assessing whether such spending has had an impact on educational outcomes is of paramount importance. We address this issue using data of better quality than what are often available in similar studies and test our identification assumption by use of a falsification test. We find that the increase in school expenditure over recent years has had a consistently positive effect on outcomes at the end of primary school. Back-of-envelope calculations suggest that the investment may well be cost-effective. There is also some evidence of heterogeneity in the effect of expenditure, with higher effects for students who come from economically disadvantaged backgrounds.     

Uneven domestic knowledge bases and the success of foreign firms in the USA

This paper investigates the effect of within-country and across-country inequalities on firms’ FDI performance, and finds drivers of success in an advanced host economy (the USA) differ for firms from developed compared to developing countries. Returns to FDI for firms from developed countries are significantly correlated with home countries’ level of economic development. In contrast, successful developing-country firms are from countries with lower within-country inequality, and reflect the industrial structure associated with developing countries: They are concentrated in scale-intensive industries and benefit especially from capital investment. The findings suggest that FDI reflects rather than disrupts unevenness in knowledge bases globally.     

Mentor Programmes-A Shortcut for Women's Academic Careers?

This article reports on a formal mentoring project that ran for eighteen months at the University of Uppsala, in Sweden. It investigates the experiences of fourteen women academics at junior and mid-level who were paired with senior academics. Mentoring occurs informally in academic as well as in other types of organizations, yet little in terms of hard evidence is known about its effects. In this case, the investigators wished to learn if mentoring in an academic context could contribute to a narrowing of the gender gap in Swedish higher education. The conclusion was that mentoring makes enough of a difference to the junior faculty concerned that it should be undertaken openly and made available to all junior faculty members wishing to be mentored.