Yo-Yo IR2 testing of elite and sub-elite soccer players: Performance,heart rate response and correlations to other interval tests     

Jørgen Ingebrigtsen  Mads Bendiksen  Morten Bredsgaard Randers  Carlo Castagna  Peter Krustrup  Andreas Holtermann 《Journal of sports sciences》2013,31(13):1337-1345

Abstract

We examined performance, heart rate response and construct validity of the Yo-Yo IR2 test by testing 111 elite and 92 sub-elite soccer players from Norway and Denmark. VO₂max, Yo-Yo IR1 and repeated sprint tests (RSA) (n = 51) and match-analyses (n = 39) were also performed. Yo-Yo IR2 and Yo-Yo IR1 performance was 41 and 25% better (P < 0.01) for elite than sub-elite players, respectively, and heart rate after 2 and 4 min of the Yo-Yo IR2 test was 20 and 15 bpm (9 and 6% HRmax), respectively, lower (P < 0.01) for elite players. RSA performance and VO₂max was not different between competitive levels (P > 0.05). For top-teams, Yo-Yo IR2 performance (28%) and sprinting distance (25%) during match were greater (P < 0.05) than for bottom-teams. For elite and sub-elite players, Yo-Yo IR2 performance was correlated (P < 0.05) with Yo-Yo IR1 performance (r = 0.74 and 0.76) and mean RSA time (r = ?0.74 and ?0.34). We conclude that the Yo-Yo IR2 test has a high discriminant and concurrent validity, as it discriminates between players of different within- and between-league competitive levels and is correlated to other frequently used intermittent elite soccer tests.  相似文献   

Validity of the ActiGraph GT1M during walking and cycling     

Bjorge Herman Hansen  Ingvild Børtnes  Maria Hildebrand  Ingar Holme  Elin Kolle  Sigmund Alfred Anderssen 《Journal of sports sciences》2013,31(6):510-516

Abstract

The ActiGraph activity monitors have developed and newer versions of the ActiGraph accelerometers (GT1M, GT3X and GT3X +) are now available, including changes in hardware and software compared to the old version (AM7164). This is problematic as most of the validation and calibration work includes the AM7164. The aims of the study were to validate the ActiGraph GT1M during level and graded walking and to assess the potential underestimation of physical activity during cycling. Data were obtained from 20 participants during treadmill walking and ergometer cycling. Energy expenditure was measured via indirect calorimetry and used as the criterion method. Activity counts were highly correlated with energy expenditure during level walking (R² = 0.82) and graded walking at 5% and 8% (R² = 0.82 and R² = 0.67, respectively). There was no linear relationship between activity counts and energy expenditure during cycling. The average activity counts for all data points during cycling was 1,157 counts per minute (CPM) (SD = 974), and mean energy expenditure was 5.0 metabolic equivalents. The GT1M is a valid tool for assessing walking across a wide range of speeds and gradients. However, there is no relationship between activity counts and energy expenditure during cycling and physical activity is underestimated by ≈73% during cycling compared to walking.  相似文献   

The role of self-determined motivation in the understanding of exercise-related behaviours,cognitions and physical self-evaluations     

Cecilie Thøgersen-Ntoumani  Nikos Ntoumanis 《Journal of sports sciences》2013,31(4):393-404

Abstract

In this study, we investigated the adjustments to posture, kinematic and temporal characteristics of performance made by lower limb amputees during the last few strides in preparation for long jump take-off. Six male unilateral trans-femoral and seven male unilateral trans-tibial amputees competing in a World Championships final were filmed in the sagittal plane using a 100-Hz digital video camera positioned so that the last three strides to take-off were visible. After digitizing using a nine-segment model, a range of kinematic variables were computed to define technique characteristics. Both the trans-femoral and trans-tibial athletes appeared to achieve their reduction in centre of mass during the flight phase between strides, and did so mainly by extending the flight time by increasing stride length, achieved by a greater flexion of the hip joint of the touch-down leg. The trans-tibial athletes appeared to adopt a technique similar to that previously reported for able-bodied athletes. They lowered their centre of mass most on their second last stride (?1.6% of body height compared with ?1.4% on the last stride) and used a flexed knee at take-off on the last stride, but they were less able to control their downward velocity at touch-down (?0.4 m · s^?1). Both this and their restricted approach speed (8.9 m · s^?1 at touch-down), rather than technique limitations, influenced their jump performance. The trans-femoral athletes lowered their centre of mass most on the last stride (?2.3% of body height compared with ?1.6% on the second last stride) and, as they were unable to flex their prosthetic knee sufficiently, achieved this by abducting their prosthetic leg during the support phase, which led to a large downward velocity at touch-down (?0.6 m · s^?1). This, combined with their slower approach velocity (7.1 m · s^?1 at touch-down), restricted their performance.  相似文献   

The effect of individualised sprint training in elite female team sport athletes: A pilot study     

Elvir Rakovic  Gøran Paulsen  Christian Helland  Ola Eriksrud 《Journal of sports sciences》2013,31(24):2802-2808

ABSTRACT

This study aimed to evaluate whether an individualised sprint-training program was more effective in improving sprint performance in elite team-sport players compared to a generalised sprint-training program. Seventeen elite female handball players (23 ± 3 y, 177 ± 7 cm, 73 ± 6 kg) performed two weekly sprint training sessions over eight weeks in addition to their regular handball practice. An individualised training group (ITG, n = 9) performed a targeted sprint-training program based on their horizontal force-velocity profile from the pre-training test. Within ITG, players displaying the lowest, highest and mid-level force-velocity slope values relative to body mass were assigned to a resisted, an assisted or a mixed sprint-training program (resisted sprinting in the first half and assisted sprinting in the second half of the intervention period), respectively. A control group (CG, n = 8) performed a generalised sprint-training program. Both groups improved 30-m sprint performance by ~1% (small effect) and maximal velocity sprinting by ~2% (moderate effect). Trivial or small effect magnitudes were observed for mechanical outputs related to horizontal force- or power production. All between-group differences were trivial. In conclusion, individualised sprint-training was no more effective in improving sprint performance than a generalised sprint-training program.  相似文献   

Occupational Physical Activity,Overweight, and Mortality     

Sidsel Graff-Iversen  Randi Selmer  Marit Sørensen  Svetlana Skurtveit 《Research quarterly for exercise and sport》2013,84(3):151-161

Abstract

This population-based 24-year follow-up study evaluated the association of occupational physical activity (OPA) with overweight and mortality in 47,405 men and women, healthy at baseline, and reporting OPA as sedentary (reference), light, moderately heavy, or heavy. The adjusted odds ratio for overweight was slightly less than 1 for all categories of current nonsedentary work in men but increased by OPA in women. Only heavy OPA conferred a lower mortality with an adjusted rate ratio of 0.84 (95% confidence interval, 0.76–0.92) for men and 0.69 (95% confidence interval, 0.52–0.91) for women. This observational study, with OPA recorded in the 1970s and 1980s, suggested a slight protective effect for overweight by nonsedentary work for men and lower mortality by heavy OPA for both genders.  相似文献   

'It's Only the Sissies …': Analysis of Teaching and Learning Processes in Physical Education: A Contribution to the Hidden Curriculum     

Helle Rønholt 《Sport, Education and Society》2013,18(1):25-36

The article is a discussion and an analysis of an event observed in a critical classroom study on teaching and learning in physical education. It demonstrates how sociocultural discourses are embedded in children's and teachers' discursive practices [Fairclough (1992) Discourse and Social Change (Cambridge, Polity Press)] in the classroom, how discourses of physical education and discourses of gender relations are connected, and how these construct and are constructed by the social structures of the physical education lesson, and influence students' learning. Using the notion of situated learning [Lave & Wenger (1991) Situated Learning: Legitimate Peripheral Participation (Cambridge, Cambridge University Press); Wenger (1998) Community of Practice: Learning, Meaning, and Identity (Cambridge, Cambridge University Press)], the paper analyses how discourses in the physical education setting influence children's learning processes, and points to the different meanings the discursive practices observed in the classroom have for the girls as compared to the boys. This analysis allows for some concluding comments on learning and the hidden curriculum in physical education.  相似文献   

Creating the Market University. How Academic Science Became an Economic Engine     

Stensaker  Björn 《Tertiary Education and Management》2012,18(4):375-376

Tertiary Education and Management -  相似文献   

Cognitive factors predicting intentions to search for health information: an application of the theory of planned behaviour     

Astrid Austvoll‐Dahlgren  Ragnhild S. Falk  Sølvi Helseth 《Health information and libraries journal》2012,29(4):296-308

  相似文献   

Yo-Yo IR2 testing of elite and sub-elite soccer players: Performance, heart rate response and correlations to other interval tests     

J Ingebrigtsen  M Bendiksen  MB Randers  C Castagna  P Krustrup  A Holtermann 《Journal of sports sciences》2012,30(13):1337-1345

Abstract We examined performance, heart rate response and construct validity of the Yo-Yo IR2 test by testing 111 elite and 92 sub-elite soccer players from Norway and Denmark. VO(2)max, Yo-Yo IR1 and repeated sprint tests (RSA) (n?=?51) and match-analyses (n?=?39) were also performed. Yo-Yo IR2 and Yo-Yo IR1 performance was 41 and 25% better (P??0.05). For top-teams, Yo-Yo IR2 performance (28%) and sprinting distance (25%) during match were greater (P?相似文献   

Learning outcomes: What are they? Who defines them? When and where are they defined?     

Tine S. Prøitz 《Educational Assessment, Evaluation and Accountability》2010,22(2):119-137

This study aims to illuminate the phenomenon of learning outcomes. Although a wide range of studies in education have examined the phenomenon in various ways, few have investigated how scholars themselves conceive of it. To provide insight into this issue, the paper explores the following questions: How is the term “learning outcome” defined? By whom? When? Where? The investigation is based on a document analysis of a selection of 33 scholarly written documents in which the concept is discussed. Findings indicate that there is a dominant established definition of the term learning outcome. However, a wide range of alternative definitions are also identified. These assert that learning outcomes involve more than what can be described in pre-specified and measurable terms.  相似文献