Changes in body mass,stature and BMI in South African elite U18 Rugby players from different racial groups from 2002–2012     

Justin Durandt  Mervin Green  Herman Masimla  Mike Lambert 《Journal of sports sciences》2018,36(5):477-484

The purpose of this study was to determine whether there are differences between racial groups for body mass, stature and body mass index (BMI) in South African elite U18 rugby players and whether there were significant changes in these measurements between 2002 and 2012. Self-reported body mass and stature were obtained from U18 players (n = 4007) who attended the national tournament during this period. BMI was calculated for each player.White players were 9.8 kg heavier than black players, who were 2.3 kg heavier than coloured players (P < 0.0001). The body mass of all groups increased from 2002 to 2012 (P < 0.0001). White players were 7.0 cm taller than black players who were 0.5 cm taller than coloured players (P < 0.0001). Players’ stature measurements did not change significantly during the study period. The average BMI of white players was 0.9 kg·m^?2 greater than black players who were on average 0.7 kg·m^?2 greater than coloured players (P < 0.0001). The BMI of all groups changed similarly over the study period. The body mass, stature and BMI of elite under-18 rugby players in South Africa were significantly different between racial groups. This has implications for transforming the game to make it representative of the South African population.  相似文献   

The ‘reel’ Jesse Owens: visual rhetoric and the Berlin Olympics     

Mike Milford 《Sport in History》2018,38(1):96-117

The story of Jesse Owens has become one of the dominant sports narratives of the twentieth century. The compelling visual record of his performance at the 1936 Berlin Olympics has been used to argue for a number of political and social causes. What is particularly fascinating about the images of Owens’s win is the ways in which it functioned for diametrically opposing ideological viewpoints. The story behind the footage reveals an interesting confluence of history and visual rhetoric. This essay considers how the Owens footage was put to work as both an example of American exceptionalism in one case and a transcendent appeal designed to mitigate the stigma of Nazi ideology in another. The principles of visual rhetoric elucidate the ways in which imagery like the Owens footage is purposefully packaged to portray these types of messages.  相似文献   

A History of Ways of Seeing the Land: Environmental History at the National Museum of Australia     

Mike Smith 《Curator: The Museum Journal》2003,46(1):7-14

One of the distinctive features of the National Museum of Australia is the prominent role of environmental history in the Museum's programs and in its organizational structure. Environmental history is a field that operates best at the boundaries of science and the humanities, where the natural sciences and social history meet. The National Museum is one of few museums that facilitate this, drawing historians, geographers, archaeologists, earth scientists, and biologists into program development as members of the one curatorial and design team. This article discusses the advantages of environmental history as a strategic focus for the Museum, and looks at one of its major exhibitions.  相似文献   

Twenty-five years of sport performance research in the Journal of Sports Sciences     

Nevill A  Atkinson G  Hughes M 《Journal of sports sciences》2008,26(4):413-426

  相似文献   

The effect of badminton-specific exercise on badminton short-serve performance in competition and practice climates     

Michael J. Duncan  Cheryl K.Y. Chan  Neil D. Clarke  Martin Cox  Mike Smith 《European Journal of Sport Science》2017,17(2):119-126

This study examined the effects of changes in physiological and psychological arousal on badminton short-serve performance in competitive and practice climates. Twenty competitive badminton players (10 males and 10 females) volunteered to participate in the study following ethics approval. After familiarisation, badminton short-serve performance was measured at rest, mid-way through and at the end of a badminton-specific exercise protocol in two conditions; competition vs. practice. Ratings of cognitive and somatic anxiety were assessed at three time points prior to badminton short-serve performance using the Mental Readiness Form 3. Heart rate and rating of perceived exertion (RPE) were assessed during the exercise protocol. Results indicated that better short-serve performance was evident in practice compared to competition (P?=?.034). RPE values were significantly higher in the competition condition compared to practice (P?=?.007). Cognitive anxiety intensity was significantly lower post-exercise in the practice condition compared to competition (P?=?.001). Cognitive anxiety direction showed greater debilitation post-exercise in the competition condition compared to practice (P?=?.01). Somatic anxiety intensity increased from pre-, to mid- to post-exercise (P?=?.001) irrespective of condition. This study suggests that badminton serve performance is negatively affected when physiological arousal, via badminton-specific exercise, and cognitive anxiety, via perceived competition, are high.  相似文献   

Characteristics and experiences of interns in strength and conditioning     

Paul Read  Jonathan D. Hughes  Richard Blagrove  Ian Jeffreys  Mike Edwards  Anthony N. Turner 《Journal of sports sciences》2017,35(3):269-276

Student coaches undertake internships to develop practical skills and gain experience to improve employability prospects. The characteristics of the coaches who undertake these internships, their experiences and the nature of the work being performed are currently unknown. The purpose of this study was to report the characteristics of strength and conditioning (S&C) coaches who have undertaken internships and their experiences during their respective placements. A total of 113 men and 6 women completed an online survey. Placements generally lasted 6–12 months (66%), were unpaid (93%) and took place at professional teams (63%). All respondents had a standard of experience prior to commencement (82%); a higher-education degree (bachelor’s degree 56%; master’s degree 18%) and others were qualified S&C coaches (16%). Activities consisted largely of coaching (47%), data collection (22%) and equipment set-up (25%) but lacked provision of appropriate training. Mentors were allocated to interns; however, often developmental objectives were not discussed, meetings were rarely documented, and in some cases, no meetings took place. This study suggests that internships offer worthwhile experiences and assistance in skill development to progress in S&C. However, clearer guidelines are required to define the responsibilities of employers and interns, to maximise these experiential learning opportunities and avoid the exploitation of willing students.  相似文献   

The effects of barbell load on countermovement vertical jump power and net impulse     

Peter D. Mundy  Neal A. Smith  Mike A. Lauder  Jason P. Lake 《Journal of sports sciences》2017,35(18):1781-1787

The aim of this study was to examine the effects of barbell load on countermovement vertical jump (CMJ) power and net impulse within a theoretically valid framework, cognisant of the underpinning force, temporal, and spatial components. A total of 24 resistance-trained rugby union athletes (average ± SD: age: 23.1 ± 3.4 years; height: 1.83 ± 0.05 m; body mass (BM): 91.3 ± 10.5 kg) performed maximal CMJ under 5 experimental conditions in a randomised, counterbalanced order: unloaded, and with additional loads of 25%, 50%, 75%, and 100% of BM. Peak power and average power were maximised during the unloaded condition, both decreasing significantly (P < 0.05) as load increased. Net impulse was maximised with 75% of BM, which was significantly greater (P < 0.05) than the unloaded and 100% of BM conditions. Net mean force and mean velocity were maximised during the unloaded condition and decreased significantly (P < 0.05) as load increased, whereas phase duration increased significantly (P < 0.05) as load increased. As such, the interaction between barbell load and the underpinning force, time, and displacement components should be considered by strength and conditioning coaches when prescribing barbell loads.  相似文献   

May be customer service needs an expert system?     

Mike Morgan 《Performance Improvement》1989,28(4):24-25

  相似文献