Comparison of force-related performance indicators between heavyweight and lightweight rowers   总被引：1，自引：0，他引：1  

Doyle MM  Lyttle A  Elliott B 《Sports biomechanics / International Society of Biomechanics in Sports》2010,9(3):178-192

The aim of this study was to examine biomechanical variables relating to the force production of men's Lightweight (LW) and Heavyweight (HW) rowing pairs. Seven HW and seven LW coxless pairs were studied under a range of stroke rates, from 20 spm to race rating (average of 33.7 spm for the HWs and 33.9 spm for the LWs). Each crew was equipped with biomechanical apparatus allowing the measurement of gate force, horizontal oar angle, and boat velocity. The HW crews exhibited significantly higher (p < 0.05) values for all variables examined, at all rates. Peak handle force was 26.2% to 30.2% higher in the HW group. Average handle force ranged from 18.7% to 22.1% higher than the LW group. Work per stroke was found to be 26% to 28% higher for the HW crews, and Power Per Kilogram was also greater for the HW crews, from 24.0% to 29.2%. The LWs were observed to be consistently, but not significantly, slower than the HWs (from 96.9% at the race situation, to 98.7% at 28 spm). These observations are important when considering biomechanical performance indicators in rowing, as significant changes in performance indicators may lead to only minimal alteration in boat velocity.  相似文献   

Implementing learning organization principles and quality assurance: The department director's view     

Betty Elliott 《Performance Improvement》1997,36(9):39-41

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Prestige auditing and the market for academic esteem: a framework and an appeal     

J. E. Elliott 《普罗米修斯》2017,35(1):57-73

Much has been written about the remarkable rise of global university rankings from their initial appearance in the Academic Ranking of World Universities (Shanghai) tables in 2003. The examination of all things rankings, however, has arguably outpaced its conceptual uptake. This paper addresses this imbalance by reviewing prestige audits as resource management tools and status allocation measures. The paper argues that audit ambition has courted audit failure in both dimensions. The resource management justification underestimates the challenge of devising reliable proxy variables across international higher education sectors, organizational types, and disciplinary/departmental objectives. Evidential data sets are duly recast as data narratives that compete with each other and cloud the ordinal clarity aspired to in ranking tables. The status competition approach generates Matthew effects and encourages factor gaming. Positional goods investments are also socially and economically wasteful. In either strict (rigid) or relaxed (normed) form, finally, their zero-sum logic fails to account for private and public externalities. The paper closes with an appeal to soft-variable evaluations in higher education contexts as well as to closer scrutiny of the vocabulary informing both quantitative and qualitative assessments.  相似文献   

Self-confidence and performance goal orientation interactively predict performance in a reasoning test with accuracy feedback     

Nadin Beckmann  Jens F. Beckmann  Julian G. Elliott 《Learning and individual differences》2009,19(2):277-282

This study takes an individual differences' perspective on performance feedback effects in psychometric testing. A total of 105 students in a mainstream secondary school in North East England undertook a cognitive ability test on two occasions. In one condition, students received item-specific accuracy feedback while in the other (standard condition) no feedback was provided. While accuracy feedback had, on average, no effect on test performance, differential effects were observed. Performance goal orientation and self-confidence moderated feedback effects on performance. The provision of accuracy feedback seemed to have performance optimising effects upon test takers with high performance goal orientation in combination with low self-confidence. The implications of these findings in relation to the validity of findings from psychological testing are discussed.  相似文献   

Perceptual learning in human and nonhuman animals: A search for common ground     

Geoffrey Hall 《Learning & behavior》2009,37(2):133-140

Perceptual learning has been extensively studied in both human and nonhuman animals, but the two lines of research have, for the most part, developed independently, addressing seemingly rather different issues by rather different methods. It has been argued, however, that analysis of the disparate phenomena studied in experiments on perceptual learning reveals that in all the studies, the essential feature is that appropriate training allows behavior to come to be controlled by the unique features, rather than by the common features, of similar stimuli. It has further been argued that experiments with nonhuman animals have established the existence of a range of learning processes that allow this to occur, and that these processes have general relevance, applying to humans as well as to animals.  相似文献   

The spiritual component of children’s lives: the role of media     

Sandra Bosacki  Anne Elliott  Spogmai Akseer  Mira Bajovic 《British Journal of Religious Education》2010,32(1):49-61

Drawn from a larger study of Canadian children’s sense of self and media habits, this study explores the role of religiosity and/or spirituality within 535 children’s (281 girls, 254 boys; 5–13 years of age) self‐reported media preferences and habits over a three‐year period. Results indicate that the theme of spirituality and/or religiosity emerged most frequently within the context of after‐school activities, music listening habits and the reading habits of participants’ mothers. Aside from children in Grade 1 (five–six years), girls were more likely than boys to mention issues of spirituality and religiosity, particularly during preadolescence (10–13 years). Younger children reported more issues of spirituality than older children. Results are discussed in terms of educational implications for critical media literacy.  相似文献   

The use of behavioural objectives as a means of holding teachers to account for their students learning. Does this render student assessment ‘fit for purpose?’     

John Elliott 《European Journal of Education》2018,53(2):133-137

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Student Veterans’ Outcomes by Higher Education Sector: Evidence from Three Cohorts of the Baccalaureate and Beyond     

Jennifer L. Steele  Peter Buryk  Geoffrey McGovern 《Research in higher education》2018,59(7):866-896

We use nationally representative survey data from three cohorts of bachelor’s degree recipients to examine military veterans’ student loan debt at graduation and their employment and earnings 1, 4, and 10 years after graduation, relative to observably similar graduates. We also examine whether the effects of veteran status depend on college sector. Using propensity score weights with covariate adjustment, we find employment and earnings premiums for veterans 1 and 4 years after graduation, and an employment penalty but earnings premium (conditional on employment) 10 years after graduation. We find no clear evidence of a for-profit employment or earnings penalty among bachelor’s degree recipients, including veterans. We do find that veterans are as likely as similar non-veterans to graduate with debt, and that graduating from a for-profit institution yields markedly higher debt amounts, especially for veterans, despite the availability of Montgomery GI Bill benefits for these cohorts.  相似文献   

Back injuries and the fast bowler in cricket     

Bruce C. Elliott 《Journal of sports sciences》2013,31(12):983-991

Here, I review research that has investigated the aetiology of injuries experienced by adolescent and adult fast bowlers. Mechanical factors play an important role in the aetiology of degenerative processes and injuries to the lumbar spine. This is particularly so in fast bowling, where a player must absorb vertical and horizontal components of the ground reaction force that are approximately five and two times body weight at front-foot and rear-foot impact, respectively. Attenuated forces are transmitted to the spine through the lower limb, while additional foces at the lumbo-sacral junction are caused by trunk hyperextension, lateral flexion and twisting during the delivery stride. Fast bowlers are classified as side-on, front-on or mixed. The mixed action is categorized by the lower body configuration of the front-on action and the upper body configuration of the side-on technique. This upper body configuration is produced by counter-rotation away from the batsman in the transverse plane about the longitudinal axis of the body of a line through the two shoulders. Counter-rotations of 12–40° during a delivery stride have predicted an increased incidence of lumbar spondylolysis, disc abnormality and muscle injury in fast bowlers. During the delivery stride, the mixed bowling action also shows: more lateral flexion and hyperextension of the lumbar spine at front-foot impact, and a greater range of motion of the trunk over the delivery stride when compared with the side-on and front-on techniques. The pars interarticularis of each vertebra is vulnerable to injury if repetitive flexion, rotation and hyperextension are present in the activity. Fast bowlers should reduce shoulder counter-rotation during the delivery stride to reduce the incidence of back injuries. When a player is required to bowl for extended periods irrespective of technique, overuse is also related to an increased incidence of back injuries and must be avoided.  相似文献   

Spot Reduction of Subcutaneous Adipose Tissue     

Arne L. Olson  Elliott Edelstein 《Research quarterly for exercise and sport》2013,84(3):647-652

Abstract

This study was designed to determine if the skinfold measurements on an exercised arm would decrease as a result of regular weight training with that arm. Thirty-two subjects completed three sets of 7-RM curls and three sets of 7-RM triceps extensions on either a daily or an alternate day schedule for a period of 6 weeks. The nonexercised arm was measured to establish the specificity of the spot reduction on the exercised arm. The results indicate that hard exercise in a specific area of the arm will result in a reduction of the subcutaneous adipose tissue in that area.  相似文献