Kinesthetic perception of the vertical as a function of sport experience     

Lejeune L  Anderson DI  Leroy D  Thouvarecq R  Jouen F 《Research quarterly for exercise and sport》2004,75(4):440-445

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Evaluating digital libraries in the health sector. Part 2: measuring impacts and outcomes     

Cullen R 《Health information and libraries journal》2004,21(1):3-13

This is the second part of a two-part paper which explores methods that can be used to evaluate digital libraries in the health sector. Part 1 focuses on approaches to evaluation that have been proposed for mainstream digital information services. This paper investigates evaluative models developed for some innovative digital library projects, and some major national and international electronic health information projects. The value of ethnographic methods to provide qualitative data to explore outcomes, adding to quantitative approaches based on inputs and outputs is discussed. The paper concludes that new 'post-positivist' models of evaluation are needed to cover all the dimensions of the digital library in the health sector, and some ways of doing this are outlined.  相似文献   

All for one, one for all: collaboration between NHS and Higher Education in establishing provision of a multi-disciplinary, hospital-based library and information services     

Black C  Bury R 《Health information and libraries journal》2004,21(Z1):39-45

Developing multi-disciplinary library and information services is high on the agenda for many NHS trusts and this brings with it a climate of change for both those who manage and work in services today. The development of such new services needs to be carefully managed and developed, and this presents a challenge for librarians and service managers. In the UK during 1999 and 2000, Aintree Hospital Trust, in conjunction with Edge Hill College of Higher Education, established a truly multi-disciplinary service based at its hospital site and managed by Edge Hill. This paper outlines the key stages in the development of the Library and Information Service with the focus on the management of change, collaboration and the development of a unique partnership between Higher Education and an NHS trust. The case study example will provide an outline of strategic and project planning, with insights into staff management and development, delivering user expectations and developing stakeholder relationships in the health library setting.  相似文献   

International training course on Health InterNetwork Access to Research Initiative (HINARI)     

Glover SW  Joshi R  Thapa G  Sonam K  Cheata T  Gleghorn C 《Health information and libraries journal》2004,21(3):193-196

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游泳推进力的流体力学分析(续)     

R.E.小施雷哈夫  吴奇三 《体育与科学》1981,(5)

这部分的研究目标是对游泳选手划水的各种熟练技能在三度空间里进行分析。所要进行的力量计算,关键在于他们的划臂动作。我们利用手的运动座标给我们表示出手的速率的大小,后掠角度和倾斜角度。函数方程式1和2: L=1/2pV~2C_CS D=1/2pV~2C_DS是可以成立的。这样,力量的计算便是可能的。 方法 分析影片步骤:运用二轴性的技巧获得电影资料。以俯视面和侧视面作为主要的观察平面。通过  相似文献   

Maximal-intensity isometric and dynamic exercise performance after eccentric muscle actions   总被引：3，自引：2，他引：1  

Byrne C  Eston R 《Journal of sports sciences》2002,20(12):951-959

A well-documented observation after eccentric exercise is a reduction in maximal voluntary force. However, little is known about the ability to maintain maximal isometric force or generate and maintain dynamic peak power. These aspects of muscle function were studied in seven participants (5 males, 2 females). Knee extensor isometric strength and rate of fatigue were assessed by a sustained 60 s maximal voluntary contraction at 80 degrees and 40 degrees knee flexion, corresponding to an optimal and a shortened muscle length, respectively. Dynamic peak power and rate of fatigue were assessed during a 30 s Wingate cycle test. Plasma creatine kinase was measured from a fingertip blood sample. These variables were measured before, 1 h after and 1, 2, 3 and 7 days after 100 repetitions of the eccentric phase of the barbell squat exercise (10 sets x 10 reps at 80% concentric one-repetition maximum). Eccentric exercise resulted in elevations in creatine kinase activity above baseline (274+/-109 U x l(-1); mean +/- s(x)) after 1 h (506+/-116 U x l(-1), P < 0.05) and 1 day (808+/-117 U x l(-1), P < 0.05). Isometric strength was reduced (P < 0.05) for 7 days (35% at 1 h, 5% at day 7) and the rate of fatigue was lower (P < 0.05) for 3 days at 80 degrees and for 1 day at 40 degrees. Wingate peak power was reduced to a lesser extent (P < 0.05) than isometric strength at 1 h (13%) and, although the time course of recovery was equal, the two variables differed in their pattern of recovery. Eccentrically exercised muscle was characterized by an inability to generate high force and power, but an improved ability to maintain force and power. Such functional outcomes are consistent with the proposition that type II fibres are selectively recruited or damaged during eccentric exercise.  相似文献   

Interaction of wrestling shoe and competition surface: effects on coefficient of friction with implications for injury   总被引：1，自引：0，他引：1  

Newton R  Doan B  Meese M  Conroy B  Black K  Sebstianelli W  Kramer W 《Sports biomechanics / International Society of Biomechanics in Sports》2002,1(2):157-166

The purpose of this study was to determine whether there is a significant difference in the co-efficient of friction (Fc) between old versus new wrestling shoes and mats and to investigate the effect of perspiration. Fc was measured by dragging a weighted shoe over a wrestling mat surface and measuring the vertical and horizontal forces produced. Three different shoe conditions were assessed over two mat types for both wet and dry conditions for a total of 12 conditions. To simulate the wet condition, saline solution was smeared over the surface of the mat. There was a significant effect of shoe, mat, and wet/dry conditions. In addition, significant interactions of shoe by mat, shoe by dry/wet, and mat by dry/wet were observed. Overall, Fc was 36% higher for the new wrestling mat compared to the old wrestling mat. Application of the saline solution reduced Fc by 14% compared to the dry condition. Comparison of the mean Fc for all three shoe types revealed the Fc for the older design shoe was 23% to 28% lower than the brand new shoe and the worn newer design, respectively. A high Fc, such as in the new mat/new shoe combination, has the potential to increase the risk of knee and ankle injuries by fixing the foot more securely to the ground.  相似文献   

The US National Library of Medicine in the 21st century: expanding collections,nontraditional formats,new audiences     

Lacroix EM  Mehnert R 《Health information and libraries journal》2002,19(3):126-132

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Children's motivation in elementary physical education: an expectancy-value model of achievement choice     

Xiang P  McBride R  Guan J  Solmon M 《Research quarterly for exercise and sport》2003,74(1):25-35

This study examined children's motivation in elementary physical education within an expectancy-value model developed by Eccles and her colleagues. Four hundred fourteen students in second and fourth grades completed questionnaires assessing their expectancy-related beliefs, subjective task values, and intention for future participation in physical education. Results indicated that expectancy-related beliefs and subjective task values were clearly distinguishable from one another across physical education and throwing. The two constructs were related to each other positively. Children's intention for future participation in physical education was positively associated with their subjective task values and/or expectancy-related beliefs. Younger children had higher motivation for learning in physical education than older children. Gender differences emerged and the findings provided empirical evidence supporting the validity of the expectancy-value model in elementary physical education.  相似文献   

Science and cycling: current knowledge and future directions for research     

Atkinson G  Davison R  Jeukendrup A  Passfield L 《Journal of sports sciences》2003,21(9):767-787

In this holistic review of cycling science, the objectives are: (1) to identify the various human and environmental factors that influence cycling power output and velocity; (2) to discuss, with the aid of a schematic model, the often complex interrelationships between these factors; and (3) to suggest future directions for research to help clarify how cycling performance can be optimized, given different race disciplines, environments and riders. Most successful cyclists, irrespective of the race discipline, have a high maximal aerobic power output measured from an incremental test, and an ability to work at relatively high power outputs for long periods. The relationship between these characteristics and inherent physiological factors such as muscle capilliarization and muscle fibre type is complicated by inter-individual differences in selecting cadence for different race conditions. More research is needed on high-class professional riders, since they probably represent the pinnacle of natural selection for, and physiological adaptation to, endurance exercise. Recent advances in mathematical modelling and bicycle-mounted strain gauges, which can measure power directly in races, are starting to help unravel the interrelationships between the various resistive forces on the bicycle (e.g. air and rolling resistance, gravity). Interventions on rider position to optimize aerodynamics should also consider the impact on power output of the rider. All-terrain bicycle (ATB) racing is a neglected discipline in terms of the characterization of power outputs in race conditions and the modelling of the effects of the different design of bicycle frame and components on the magnitude of resistive forces. A direct application of mathematical models of cycling velocity has been in identifying optimal pacing strategies for different race conditions. Such data should, nevertheless, be considered alongside physiological optimization of power output in a race. An even distribution of power output is both physiologically and biophysically optimal for longer ( > 4 km) time-trials held in conditions of unvarying wind and gradient. For shorter races (e.g. a 1 km time-trial), an 'all out' effort from the start is advised to 'save' time during the initial phase that contributes most to total race time and to optimize the contribution of kinetic energy to race velocity. From a biophysical standpoint, the optimum pacing strategy for road time-trials may involve increasing power in headwinds and uphill sections and decreasing power in tailwinds and when travelling downhill. More research, using models and direct power measurement, is needed to elucidate fully how much such a pacing strategy might save time in a real race and how much a variable power output can be tolerated by a rider. The cyclist's diet is a multifactorial issue in itself and many researchers have tried to examine aspects of cycling nutrition (e.g. timing, amount, composition) in isolation. Only recently have researchers attempted to analyse interrelationships between dietary factors (e.g. the link between pre-race and in-race dietary effects on performance). The thermal environment is a mediating factor in choice of diet, since there may be competing interests of replacing lost fluid and depleted glycogen during and after a race. Given the prevalence of stage racing in professional cycling, more research into the influence of nutrition on repeated bouts of exercise performance and training is required.  相似文献