运动员的专门力量训练

前言运动员没有高度的专门身体训练水平,要达到现代的优异运动成绩是不可能的.在任何运动专项中运动员都要发挥出该专项特有的肌力,运动员其他各种身体素质和运动能力的发展和发挥也将取决于     

Postcontraction influences on reaction time

The purpose of this study was to compare reaction time (RT) and fractionated RT components (premotor and motor times) between normal and postcontraction conditions. Twelve participants performed 20 trials each of control and postcontraction RT conditions. For the control condition, participants executed a learned, rapid, knee-extension contraction response to an auditory stimulus. The postcontraction condition was identical to the control condition except that the participants performed a 3-s isometric contraction of the knee extensor muscles prior to an auditory stimulus. Muscle activity was recorded from the quadriceps muscle group. Results indicated that the postcontraction condition was significantly faster than the control condition for the average RT, premotor time, and motor time. It was concluded that reaction time, processing time, and muscle contraction time for a learned task could be significantly reduced following an isometric contraction.     

Interaction of wrestling shoe and competition surface: effects on coefficient of friction with implications for injury

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.     

The ASVIN Project: a study of electronic and printed veterinary science journals in the UK and Ireland

ASVIN was a Research Support for Libraries Programme (RSLP) Funded Project, whose principal aim was to develop better co-operation between nine libraries in the veterinary and animal health field. The project examined a number of library-related areas, such as journal archiving, collection development policies, development of a common Z39.50 catalogue interface, grey literature, and printed and electronic journals. This paper examines the latter, whilst also providing a detailed analysis of printed journals held in partner libraries. Comparisons of the nine partner library collections are undertaken with a range of secondary sources, and an ASVIN core list of veterinary journals was developed. It looks at some of the issues relating to e-journals, expressing the benefits and concerns that many librarians are experiencing, such as licensing arrangements, archiving and general management issues.     

Producing an information leaflet to help patients access high quality drug information on the Internet: a local study

Objectives: To develop a patient information leaflet (PIL) to help local patients meet their drug information needs using the Internet, and to perform a preliminary evaluation of this tool. Methods: Development—a cross‐sectional survey of the drug information needs of local patients using a semi‐structured questionnaire; assessment of websites offering free, consumer‐orientated medicines information using set criteria; identification of consensus criteria to evaluate the quality of health‐related on‐line information; evaluation—views on a draft patient information leaflet from a focus group. Results: Those surveyed felt that being directed to high‐quality websites and being provided with assessment criteria for on‐line information would be useful. The three websites fulfilling most of the set quality criteria were Surgery Door ( www.surgerydoor.co.uk ), InteliHealth ( www.intelihealth.com ) and medline plus ( www.nlm.nih.gov/medlineplus ). The six most frequently cited assessment criteria were currency, authorship, commerciality, relevance, links and attribution. A draft leaflet was constructed listing the above three websites and six criteria along with tips on how to search the Internet effectively. A focus group reacted favourably. Conclusion: The Internet is a source of drug information—an information leaflet may help to guide local patients through its variable information quality.     

Effects of uncontrollability and failure on the development of learned helplessness in perceptual-motor tasks

The aim of this study was to distinguish between the roles of uncontrollability and failure on learned helplessness in a perceptual-motor task. Forty-eight junior high school students were randomly assigned in a 2 x 2 (Controllability: Contingent vs. Yoked Noncontingent Feedback x Type of Outcome: Success vs. Failure) factorial design to complete a gun-shooting task on a moving target using a computer screen. Twelve other participants (control group) simply read a passage. After filling out causal attribution and self-efficacy expectations questionnaires, all participants carried out another gun-shooting task (test task). Results showed that contingency led to higher performances than noncontingency. Success conditions elicited higher self-efficacy expectations than failure conditions. Failure entailed less persistence than success did for participants who had been assigned to the contingency condition. Internalization of failure was negatively correlated with persistence. Comparisons with the control group showed that expectations and performance deficits of learned helplessness were provoked by failure in noncontingent situations; persistence deficits were due to failure in contingent situations. These results reveal that both uncontrollability and failure can be responsible for different forms of learned helplessness.     

对美国社区学院课程演变的考察

美国社区学院的课程直接反映了学生们截然不同的目标。纵观其历史，社区学院已经维持着一种去反映学生抱负模式的变化和地方经济模式改变的课程使命。这正反映着社区学院独有的特点并有可能被当成是其最大的力量。