Injury prevention in male youth soccer: Current practices and perceptions of practitioners working at elite English academies     

Paul J. Read  Pablo Jimenez  Jon L. Oliver  Rhodri S. Lloyd 《Journal of sports sciences》2018,36(12):1423-1431

Forty-one practitioners inclusive of physiotherapists, sports scientists and strength and conditioning coaches from the academies of elite soccer clubs in the United Kingdom completed an on-line questionnaire which examined their: (1) background information; (2) perceptions of injury occurrence and risk factors; (3) screening and return to play; and (4) approach to designing and delivering injury prevention programmes with a response rate of 55% (41/75). Contact injuries were the most common mechanism reported and players between 13–16 years of age were perceived to be at the greatest risk. Pertinent risk factors included: reduced lower limb and eccentric hamstring strength, proprioception, muscle imbalances, and under developed foundational movement skills. Joint range of motion, jump tests, the functional movement screen, overhead and single leg squats were the most utilised screening methods. Training modalities rated in order of importance included: resistance training, flexibility development, agility, plyometrics and balance training. Training frequency was most commonly once or twice per week, during warm-ups, independent sessions or a combination of both. Injury prevention strategies in this cohort appear to be logical; however, the classification of injury occurrence and application of screening tools to identify “at risk” players do not align with existing research. The frequency and type of training used may also be insufficient to elicit an appropriate stimulus to address pertinent risk factors based on current recommendations.  相似文献   

Impact of short- compared to long-haul international travel on the sleep and wellbeing of national wheelchair basketball athletes     

Heidi R. Thornton  Joanna Miller  Lee Taylor  Charli Sargent  Michele Lastella 《Journal of sports sciences》2018,36(13):1476-1484

Currently, very little is known about the impact of short- or long-haul air travel on the sleep and wellbeing of wheelchair basketball athletes. Eleven national wheelchair basketball athletes wore actigraphy monitors prior, during, and after air travel to the United Kingdom. Upon arrival, participants rated their subjective jet-lag, fatigue, and vigor. Individuals traveled to the United Kingdom from different locations in Australia, the United States, and Europe and were categorised according to travel length [LONG (up to 30.2 h) or SHORT (up to 6.5 h)]. Linear mixed models determined effects of travel length on sleep and subjective ratings of jet-lag, fatigue, and vigor. During competition, subjective fatigue and jet-lag were substantially higher (ES = 0.73; ±0.77) and (ES = 0.57; ±0.60), subjective vigor was lower (ES = 1.94; ±0.72), and get-up time was earlier (ES = 0.57; ±0.60) for LONG when compared to SHORT. Travelling greater distances by airplane had a larger effect on subjective ratings of jet-lag, fatigue and vigor, rather than sleep. Irrespective of travel group, sleep and subjective responses were compromised, reflecting the travel requirements, competition-mediated influences, and/or due to a change in environment.  相似文献   

Methodology and cohort profile for the Hangzhou Lumbar Spine Study: a study focusing on back health in a Chinese population     

Xiao-jian Hu  Lun-hao Chen  Michele C. Battié  Yue Wang 《Journal of Zhejiang University. Science. B》2018,19(7):547-558

Back pain is a worldwide health problem, adding a tremendous burden to modern societies. However, little information on back health is available in China, even though a quarter of the world’s population is Chinese. To enhance knowledge in this area, we designed and initiated the Hangzhou Lumbar Spine Study, which is a cross-sectional study of a general sample of mainland Chinese with focusing on disc degeneration, Modic changes, endplate lesions, and back pain. The study consists of a structured questionnaire to measure back pain history and lifetime exposure to suspected risk factors, magnetic resonance imaging of the lumbar spine, bone mineral density study of the spine and hip, and DNA sample analysis. Here we briefly introduce the study methodology, report the test-retest reliability of the questionnaire, and describe the cohort profile to date. Since May 2014, 301 randomly selected subjects (male/female, 122/179; mean age, 51.0 years; range, 20–87 years) have been recruited. Tests-retests of the questionnaire, completed by 40 participants, revealed good reliability. To our knowledge, the Hangzhou Lumbar Spine Study is the first population-based epidemiological study conducted to characterize lumbar spinal phenotypes and back pain, their interaction, and their associations with lifetime environmental exposure, in mainland Chinese. Epidemiological information obtained from a reliable questionnaire, magnetic resonance (MR) imaging data, dual energy X-ray absorptiometry (DXA) measurements, and DNA analysis may serve as a valuable reference for future studies on back health, particularly for mainland Chinese.  相似文献   

Seeing in the Dark: Embodied Cognition in Amateur Astronomy Practice     

Flávio S. Azevedo  Michele J. Mann 《学习科学杂志》2018,27(1):89-136

We add to research on embodied cognition by investigating the observational practices of amateur astronomers. Specifically, we take an interactionist perspective and examine how the body is recruited, moment by moment, as a resource for producing and communicating meaning during field activity. The data corpus is a set of ethnographic video records and field notes on the routines of a community of astronomers, especially small-group interactions during planning, searching for, observing, and confirming sight of a celestial target. Within this space, our analysis highlights how different modalities of embodied action and reasoning (gestures, tool use, gaze, touch, and others) were deployed and coordinated throughout the process of observing a celestial object and how those emerged in the transactions among participants. Our findings rehearse many issues and topics in the contemporary literature (e.g., gesturing for measuring or representationally) but also reveal important, novel forms of embodied action and reasoning in science, technology, engineering, and mathematics practices (e.g., training the eyes in averted vision and inscribing a celestial scene onto one’s hand). More broadly, these findings further affirm the power of interactionist analyses of knowing and learning while also surfacing areas in which expanded theorizing is needed to account for the full set of cognitive phenomena we observed.  相似文献   

‘All of us together in a blurred space’: principles for co-creating curriculum with international partners     

Rebecca Bilous  Laura Hammersley  Kate Lloyd  Felicity Rawlings-Sanaei  Greg Downey  Maria Amigo 《International Journal for Academic Development》2018,23(3):165-178

This paper shares an innovative methodology to ‘co-create’ a curriculum with eleven international community development organisations from seven countries to prepare undergraduate students for international work-integrated learning activities. The co-creation process was complex, messy, and always evolving. Here we reflect on and document the process, identifying three key methodological principles that might guide the co-creation process for others. These principles embrace the unpredictable, emotional, and personal reality of bringing together diverse ideas and perspectives, as well as opening up possibilities for more creative ways of communicating and listening to what is seen, heard, and felt.  相似文献   

Iron status in Winter Olympic sports     

D. B. Clement  D. R. Lloyd‐Smith  J. G. Macintyre  G. O. Matheson  R. Brock  Michel Dupont 《Journal of sports sciences》2013,31(3):261-271

Iron status was surveyed amongst 92 Winter Olympic sport athletes from Nordic and Alpine skiing, figure and speed skating and ice hockey. Haemoglobin and serum ferritin values were obtained by physicians as part of a monitoring programme, since iron deficiency would have an adverse effect on maximal performance. Four (7%) of 56 men were anaemic (Hb < 14.0 gdl^‐1) and three (8%) of 36 women had haemoglobin values less than 12.0 gdl^‐1. Nine men (16%) and 14 women (39%) had prelatent iron deficiency (serum ferritin < 30 ng ml^‐1). Ice hockey had the lowest while Nordic skiing had the highest incidence of sub‐optimal iron status. A total of 50% of Nordic women skiers had prelatent iron deficiency and 7% were anaemic. An equal percentage of women speed skaters were low in serum ferritin as well. Only one of 20 male ice hockey players was low in serum ferritin. These results suggest there would be value in instituting screening procedures for iron status in Winter Olympic Sports.  相似文献   

Reliability and validity of field-based measures of leg stiffness and reactive strength index in youths     

Rhodri S. Lloyd  Jon L. Oliver  Michael G. Hughes  Craig A. Williams 《Journal of sports sciences》2013,31(14):1565-1573

Abstract

The aim of the study was to assess the reliability of a mobile contact mat in measuring a range of stretch–shortening cycle parameters in young adolescents. Additionally, vertical leg stiffness using contact mat data was validated against a criterion method using force–time data. The reliability study involved 18 youths completing a habituation and three separate test sessions, while 20 youths completed a single test session for the validity study. Participants completed three trials of a squat jump, countermovement jump, and maximal hopping test and a single trial of repeated sub-maximal hopping at 2.0 Hz and 2.5 Hz. All tests were performed on the contact mat. Reliability statistics included repeated-measures analysis of variance, intraclass correlation coefficient, and coefficient of variation (CV), while the correlation coefficient (r) and typical error of estimate (TEE) were reported for the validity study. Squat jump height was the most reliable measure (CV = 8.64%), while leg stiffness during sub-maximal hopping, and reactive strength index produced moderate reliability (CV = 10.17–13.93% and 13.98% respectively). Measures of leg stiffness obtained from contact mat data during sub-maximal hopping were in agreement with the criterion measure (r = 0.92–0.95; TEE = 6.5–7.5%), but not during maximal hopping (r = 0.59; TEE = 41.9%). The contact mat was deemed a valid tool for measuring stretch–shortening cycle ability in sub-maximal but not maximal hopping. Although reliability of performance was generally moderate, the tests offer a replicable assessment method for use with paediatric populations.  相似文献   

A Nomogram for the Estimate of Percent Body Fat from Generalized Equations     

William B. Baun  Michele R. Baun  Peter B. Raven 《Research quarterly for exercise and sport》2013,84(3):380-384

Abstract

Fifteen well-conditioned college women, who had been thoroughly trained in the correct technique for women's push-ups, were tested for maximal pushing strength in two positions and for the number of complete push-ups they were able to perform at the rate of 41 push-ups per minute. For statistical purposes, calculations of maximal strength for each individual were based upon the average of the recorded maximal arm strengths in the high and low positions plus the average of the weight supported in the high and low positions. The work load was calculated from the distance between the high and low positions, the average supported weight, and the number of push-ups the subject was able to perform until exhausted. A correlation coefficient of .76 was obtained between the calculated maximal strength measures and the work load, indicating a statistically significant positive relationship.  相似文献   

Change in Teacher Education: interpreting and experiencing new professional roles     

David Blake  Vince Hanley  Mike Jennings  Michele Lloyd 《欧洲师范教育杂志》1996,19(1):19-34

In this paper we consider the effect of moves by the British Government to make initial teacher education (ITE) in England and Wales more school‐based (Blake, 1993). To monitor the impact of this shift towards school‐based training we conducted a fine grain study of what was happening on the ground within the one‐year Secondary School‐Based Postgraduate Certificate in Education (PGCE) at the Chichester Institute of Higher Education (ChIHE). * *At the time the research was conducted, the Institute's name was the West Sussex Institute of Higher Education, hence interviewees refer to ‘WSIHE’ and ‘West Sussex’. View all notes Data were gathered from questionnaire surveys and interviews. Findings from our regional case study indicate that while school‐based ITE programmes may offer student teachers greater insight into school life, this should not be at the expense of developing students’ analytical and theoretical understanding of education and schooling promoted within higher education‐based work.  相似文献   

Moving towards transdisciplinarity: an ecological sustainable focus for science and mathematics pre‐service education in the primary/middle years     

Kathryn Paige  David Lloyd  Mike Chartres 《Asia-Pacific Journal of Teacher Education》2008,36(1):19-33

One reason we have difficulty finding sustainable solutions is in part because we are unable to see the bigger picture. Capra (2000 Capra, F. 2000. The challenge of our time.. Resurgence, 203: 18–20.  [Google Scholar]) argues, “To become ecologically literate we must learn to think systemically – in terms of connectedness, context and processes” (p. 270). We have attempted to structure connected learning experiences through our transdisciplinary approach to teaching for learning science, mathematics and ecological aspects of society and environment. We support Jucker's (2002 Jucker, R. 2002. Our common illiteracy: Education as if the Earth and people mattered, Frankfurt: Peter Lang.  [Google Scholar]) view that we must have lateral rigor across disciplines and vertical rigor within disciplines in order to best prepare students for teaching. This paper explores the theoretical underpinning of this complex approach to undergraduate teaching and reports on how our teaching team has worked collaboratively to structure a sequence of three, one semester integrated, core courses that explicitly uses an educating for ecological sustainability theme as the basis for each course and associated assessment.  相似文献