Effects of the Nordic Hamstring exercise on sprint capacity in male football players: a randomized controlled trial

This assessor-blinded, randomized controlled superiority trial investigated the efficacy of the 10-week Nordic Hamstring exercise (NHE) protocol on sprint performance in football players.

Thirty-five amateur male players (age: 17–26 years) were randomized to a do-as-usual control group (CG; n = 17) or to 10-weeks of supervised strength training using the NHE in-season (IG; n = 18). A repeated-sprint test, consisting of 4 × 6 10 m sprints, with 15 s recovery period between sprints and 180 s between sets, was conducted to evaluate total sprint time as the primary outcome. Secondary outcomes were best 10 m sprint time (10mST) and sprint time during the last sprint (L10mST). Additionally, peak eccentric hamstring strength (ECC-P_HS) and eccentric hamstring strength capacity (ECC-CAP_HS) were measured during the NHE.

Ten players were lost to follow-up, thus 25 players were analyzed (CG n = 14; IG n = 11). Between-group differences in mean changes were observed in favor of the IG for sprint performance outcomes; TST (?0.649 s, p = 0.056, d = 0.38), 10mST (?0.047 s, p = 0.005, d = 0.64) and L10mST (?0.052 s, p = 0.094, d = 0.59), and for strength outcomes; ECC-P_HS (62.3 N, p = 0.006, d = 0.92), and ECC-CAP_HS (951 N, p = 0.005, d = 0.95).

In conclusion, the NHE showed small-to-medium improvements in sprint performance and large increases in peak eccentric hamstring strength and capacity.

Trial Registration Number: NCT02674919     

Heart rate and movement pattern in street soccer for homeless women

Street soccer has been shown to be effective in improving cardiovascular and musculoskeletal fitness in homeless men, due to high heart rate (HR) and multiple intense actions. The purpose of this study was to investigate HR, movement pattern, rating of perceived exertion (RPE), flow and worry during street soccer for homeless women. Fifteen homeless women (30.3?±?5.0?years [± standard deviation, SD], 1.65?±?0.08?m, 65.1?±?11.0?kg, 5?±?4?years football experience) from three countries participated in 4?a-side street soccer games in Women’s Homeless World Cup 2015. Mean and peak HR were 174?±?7 and 188?±?10?beats per minute (bpm), respectively, and >160 bpm 76?±?23% of the playing time (11.1?±?2.6?min). Distance covered per minute was 68.6?±?8.9?m of which 82?±?14, 15?±?6 and 3?±?3% were covered with low- (0–9?km/h), moderate- (9–13?km/h) and high-speed (>13?km/h) running, respectively. The 43?±?5, 45?±?3 and 12?±?3% of the distance were covered running forward, sideways, and backward, respectively. Player Load was 9.2?±?1.7?arbitrary units (AU) per minute and the number of accelerations >1.5?ms^–2 was 15.3?±?2.7 per minute. The score for flow was high (5.5?±?0.8), whereas rating of perceived exertion (RPE) values (4.8?±?2.5) and the score for worry (4.6?±?1.3) were moderate. Street soccer for homeless women elicits high HR and a movement pattern comparable and for some parameters even higher than street soccer and recreational football for homeless and untrained men. Street soccer may be a suitable training intervention for homeless women, and especially moderate RPE and high flow score speaks in favour of an expectation of high participation and adherence.     

Tracking of physical activity in adolescence

The present analysis aimed to describe the degree of tracking of physical activity over an 8-year follow-up period among a cohort of 557 adolescents in western Norway (13 years of age at baseline). Frequency and time spent in leisure-time physical activity were assessed at ages 13, 14, 15, 16, 18, 19 and 21 years through self-report questionnaires. The cross-sectional results indicated that proportions of adolescents who were physically active declined from 13 to 19 years of age and increased slightly from 19 to 21 years of age. Longitudinally, various measures indicated a weak degree of tracking of physical activity (Pearson's r was .22 for boys and. 18 for girls across the 8-year period). The least active persons during early adolescence were those least likely to change during their teenage years. In sum, the findings indicated a weak tendency of tracking of physical activity through adolescence.     

Innovation and isomorphism: A case-study of university identity struggle 1969–1999

Higher education institutions face today strongpressure from institutional environments toadopt certain structures and management systemsfor reasons of legitimacy and survival.However, the external pressure is multifaceted, demanding organisational and educationalinnovations on one side and adjustments todeveloping national and international standardson the other. By studying a Norwegianuniversity from its establishment in 1969 to1999, and by extensive triangulation of morequalitative studies on this university in thisperiod, the paper concludes that highereducation institutions may handle this dilemmaby relating it to the continuous struggle fororganisational identity.     

Dyslexia and hormone deficiences

From a group of 75 children, originally selected as dyslectic on the basis of their reading and/or spelling problems relative to a total group of 1000 4.th grade children in the city of Trondheim, blood tests were obtained on 35 children. A control group of 45 children was drawn among the 1000 children. Among the 12 different hormones measured, significant differences came out on cortisol, triiodothyronine (T. 3), prolactin, and human growth hormone (HGH, somatotrophin) in boys and girls separately. A follow-up study of 22 dyslectic children from the same cohort gave results consistent with those obtained in the original study. The higher values of the dyslectic group on cortisol and prolactin may suggest the dyslectics to be in a stressful situation, possibly due to their language problems in school. The most striking difference, however, was the very low levels of HGH in the dyslectic group—to the extent that there was little overlap in the two distributions. This result was totally unexpected and is, in fact, opposite of what to be expected on the basis of at least short — time stress events. The results holds up when age and pubery development are controlled for.     

An analysis of teacher-defined activities with mobile technologies: predecessor and successor tool use in the classroom

In this paper, different perspectives on the role of the teacher in a classroom equipped with personal digital assistants (PDAs) are presented. We report on four classroom studies conducted in two countries, Norway and the USA. The overall aim is to understand the use of new tools in different contexts. The key question that we explore concerns the teachers’ pedagogical use of the new tool and why certain tools are adopted and others are not. In one case, the activities simulated the affordances and constraints of the tools used prior to the PDA. In the other case, the activities harnessed the affordances and constraints offered by the successor tool, the PDA. We raise the question as to why these tools were used in two different ways. We analyse our findings in terms of sociocultural theory and concepts of human–computer interaction. Finally, we summarize our results and discuss some educational implications.     

Doomed to be Entrepreneurial: Institutional Transformation or Institutional Lock-Ins of ‘New’ Universities?

Universities worldwide are facing enormous strains as a result of increased external expectations where global visibility should be mixed with local and regional utility. In debates on the future of higher education, becoming an entrepreneurial university has been highlighted as a novel – although perhaps a more hybrid – way to deal with this challenge. However, while the label entrepreneurial points to an image of the university as a dynamic free agent shaped in the interplay between dynamic environments and internal flexibility, the current article takes a more critical view on the factors conditioning universities with the ambitions of becoming more entrepreneurial – particularly those of more recent age and less academic standing. For these institutions it is suggested that the university ideal of being entrepreneurial may lead to a situation of strategic inertia characterized by an institutionalized ‘lock-in’ with few alternative development paths.