排序方式: 共有108条查询结果,搜索用时 15 毫秒
31.
Cramer JT Beck TW Housh TJ Massey LL Marek SM Danglemeier S Purkayastha S Culbertson JY Fitz KA Egan AD 《Journal of sports sciences》2007,25(6):687-698
The aims of this study were to examine the acute effects of static stretching on peak torque, work, the joint angle at peak torque, acceleration time, isokinetic range of motion, mechanomyographic amplitude, and electromyographic amplitude of the rectus femoris during maximal concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1) in men and women. Ten women (mean +/- s: age 23.0 +/- 2.9 years, stature 1.61 +/- 0.12 m, mass 63.3 +/- 9.9 kg) and eight men (age 21.4 +/- 3.0 years, stature 1.83 +/- 0.11 m, mass 83.1 +/- 15.2 kg) performed maximal voluntary concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1). Following the initial isokinetic tests, the dominant leg extensors were stretched using four static stretching exercises. After the stretching, the isokinetic tests were repeated. Peak torque, acceleration time, and electromyographic amplitude decreased (P< or = 0.05) from pre- to post-stretching at 1.04 and 5.23 rad . s(-1); there were no changes (P > 0.05) in work, joint angle at peak torque, isokinetic range of motion, or mechanomyographic amplitude. These findings indicate no stretching-related changes in the area under the angle - torque curve (work), but a significant decrease in peak torque, which suggests that static stretching may cause a "flattening" of the angle - torque curve that reduces peak strength but allows for greater force production at other joint angles. These findings, in conjunction with the increased limb acceleration rates (decreased acceleration time) observed in the present study, provide tentative support for the hypothesis that static stretching alters the angle - torque relationship and/or sarcomere shortening velocity. 相似文献
32.
33.
Travis Weiland 《Teaching Statistics》2017,39(1):20-25
Context is at the core of any statistical investigation, yet many statistics tasks barely require students to go beyond superficial consideration of the contexts the tasks are situated in. In this article, I discuss a framework for evaluating the level of interaction with context a task requires of students and how to modify tasks to increase the levels of interaction required. 相似文献
34.
Haines TL McBride JM Triplett NT Skinner JW Fairbrother KR Kirby TJ 《Journal of sports sciences》2011,29(13):1435-1442
The purpose of this investigation was to compare valgus/varus knee angles during various jumps and lower body strength between males and females relative to body mass. Seventeen recreationally active females (age: 21.94 ± 2.59 years; height: 1.67 ± 0.05 m; mass: 64.42 ± 8.39 kg; percent body fat: 26.89 ± 6.26%; squat one-repetition maximum: 66.18 ± 19.47 kg; squat to body mass ratio: 1.03 ± 0.28) and 13 recreationally active males (age: 21.69 ± 1.65 years; height: 1.77 ± 0.07 m; mass: 72.39 ± 9.23 kg; percent body fat: 13.15 ± 5.18%; squat one-repetition maximum: 115.77 ± 30.40 kg; squat to body mass ratio: 1.59 ± 0.31) performed a one-repetition maximum in the squat and three of each of the following jumps: countermovement jump, 30 cm drop jump, 45 cm drop jump, and 60 cm drop jump. Knee angles were analysed using videography and body composition was analysed by dual-energy X-ray absorptiometry to allow for squat to body mass ratio and squat to fat free mass ratio to be calculated. Significant differences (P ≤ 0.05) were found between male and female one-repetition maximum, male and female squat to body mass ratio, and male and female squat to fat free mass ratio. Significant differences were found between male and female varus/valgus knee positions during maximum flexion of the right and left leg in the countermovement jump, drop jump from 30 cm, drop jump from 45 cm, and drop jump from 60 cm. Correlations between varus/valgus knee angles and squat to body mass ratio for all jumps displayed moderate, non-significant relationships (countermovement jump: r = 0.445; drop jump from 30 cm: r = 0.448; drop jump from 45 cm: r = 0.449; drop jump from 60 cm: r = 0.439). In conclusion, males and females have significantly different lower body strength and varus/valgus knee position when landing from jumps. 相似文献
35.
Tatum Adiningrum Sean Sturm Barbara Kensington-Miller 《International Journal for Academic Development》2019,24(2):109-121
ABSTRACTEmploying part-time and casual academics is now a widely accepted practice in higher education globally. We explored the issue of the identity of part-time academics in Indonesian higher education through interviews with 14 part-time and 11 full-time academics. Both groups identified more strongly with their teaching roles than with other roles. However, they differed in their perceptions of opportunities to enact their chosen academic roles and of the kind of academic development they needed. The current standardised model of academic development needs to be rethought to offer more flexibility and to invite departments’ participation in the development of their academics. 相似文献
36.
37.
John Henry Katherine Neal Sokhieng Au Gabrielle M. O'Sullivan John Forge Rosemary Robins Stephen Healy Mark Rix James Tabery Katie Vann Carl Windhorst Katherine Neal Peter Neushul Gail Clements Ingo Brigandt Nicolas Rasmussen Anthony S. Travis Lloyd Ackert Simon Knell Claire Hooker 《Metascience》2002,11(2):201-268
38.
Web 2.0 offers a new type of interactive technology that may change the focus and approach of formal education in ways we
are just beginning to comprehend. The new and unique qualities of Web 2.0 can be compounded in traditional educational settings
by the fact that students often times have far more experience with and understanding the new technology than the teachers
who are developing curriculums and setting educational goals. At the same time, Web 2.0 has become so pervasive in such a
short time that it makes little sense to ignore it in educational settings. This current article suggests blogging may be
the most “education friendly” of the new interactive tools. Blog posts offer students the opportunity to develop their own
voice in the classroom, while commentary serves as an important reinforcement for self-reflection and continued participation.
The difficulty for teachers is in understanding how to integrate, use and maintain course blogs so that they are a strong
and positive educational force in the classroom. At the core of using blogs is the development of blog management strategies.
Based on the authors’ use of blogs in undergraduate courses, the current paper outlines an approach to blog management. 相似文献
39.
The client's perception of the therapy relationship is an essential component of modern theoretical orientations. To date, there is a lack of quantitative research examining how the therapeutic bond affects therapy outcomes in college counseling. This study used path analysis to examine longitudinal therapy outcomes with 423 college students. Having a stronger therapeutic bond predicted decreased symptoms of depression, social anxiety, and academic distress. Findings support continued attention to developing a working relationship. 相似文献
40.
For more than 20 years, two courses, History, Education, and Guidance of the Deaf/Hard of Hearing and Introduction to Instructional Methods for the Deaf/Hard of Hearing, have been taught at Bloomsburg University of Pennsylvania using a traditional lecture format. A state grant provided funding to explore the use of technology to teach online courses to college-age learners who are deaf, hard of hearing, or hearing. Saba Centra software was used as the online tool for the synchronous presentation of course content, which included PowerPoint lecture material, text chat opportunities, sign language-interpreted video, and other forms of class participation (e.g., signaling for questions raised, responding in a "yes/no" format). The present article covers recent successes and challenges in offering online courses in a "virtual classroom" format to deaf and hard of hearing learners, as well as hearing learners, from a qualitative research perspective. 相似文献