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61.
The role of upper torso and pelvis rotation in driving performance during the golf swing 总被引：3，自引：2，他引：1
While the role of the upper torso and pelvis in driving performance is anecdotally appreciated by golf instructors, their actual biomechanical role is unclear. The aims of this study were to describe upper torso and pelvis rotation and velocity during the golf swing and determine their role in ball velocity. One hundred recreational golfers underwent a biomechanical golf swing analysis using their own driver. Upper torso and pelvic rotation and velocity, and torso-pelvic separation and velocity, were measured for each swing. Ball velocity was assessed with a golf launch monitor. Group differences (groups based on ball velocity) and moderate relationships (r > or = 0.50; P < 0.001) were observed between an increase in ball velocity and the following variables: increased torso-pelvic separation at the top of the swing, maximum torso-pelvic separation, maximum upper torso rotation velocity, upper torso rotational velocity at lead arm parallel and last 40 ms before impact, maximum torso-pelvic separation velocity and torso-pelvic separation velocity at both lead arm parallel and at the last 40 ms before impact. Torso-pelvic separation contributes to greater upper torso rotation velocity and torso-pelvic separation velocity during the downswing, ultimately contributing to greater ball velocity. Golf instructors can consider increasing ball velocity by maximizing separation between the upper torso and pelvis at the top of and initiation of the downswing. 相似文献
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Peter C. Rouse Joan L. Duda Nikos Ntoumanis Kate Jolly Geoffrey C. Williams 《European Journal of Sport Science》2016,16(1):106-114
This study describes the development and psychometric characteristics of an observational instrument that examines four aspects of interpersonal support (or lack of) provided during physical activity (PA) promotion consultations (i.e., Autonomy Support, Involvement, Structure and Interpersonal Control), as identified by Self-determination Theory (SDT). The reliability and validity of the Interpersonal Support in Physical Activity Consultations Observational Tool (ISPACOT) were examined within an exploratory randomised control trial. Recorded consultations (N = 42) conducted by qualified PA advisors (N = 14) at 13 leisure centres across the West Midlands (UK) were rated. Intra-class correlation coefficients (ICC) indicated moderate to high inter-rater reliability for overall interpersonal support (0.80), and the Autonomy Support (0.74), Involvement (0.73) and Structure (0.91) dimensions, but low reliability for Interpersonal Control (0.35). The advisors, who conducted PA promotion consultations that were rated as low in their interpersonally supportive features, were perceived by their clients as being less supportive (F(1,10) = 5.0, p <.05). Ratings on the ISPACOT differentiated advisors who were trained in SDT principles and those who were not. Overall, the findings provided preliminary evidence for the reliability and convergent validity of the ISPACOT. 相似文献
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Liz Atkins 《British Journal of Special Education》2016,43(1):6-21
This article explores tensions between the policies and practice of inclusion and the lived experiences of disabled young people in education. Drawing on the narratives of two young men who participated in a small pilot study, it utilises theoretical concepts related to disability, structure and agency, and power and control, as it explores the ways in which inclusion can create subtle (and sometimes not so subtle) forms of exclusion. Focusing on the young men's experiences of further and higher education, it is argued that inclusive practices and policies, however well intentioned, can create new and subtle forms of marginalisation through the structures and discourse intended to address exclusion. I conclude by questioning whether, in a diverse and disparate society, in which all our lives are defined by the extent to which we are more or less equal than others, inclusion can ever be anything other than an illusory concept. 相似文献
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In June of 1970, a group of radio station programmers, record company executives, cartoonists, musicians, poets, political activists, and assorted hippie hangers-on gathered at Goddard College in Plainfield, Vermont for the Alternative Media Conference (AMC). In this article, the authors trace the history of the AMC, from its initial inception in 1970 to the second Alternative Media Conference in 2013, and its role in shaping not only alternative media across the United States but also, more specifically, Free-Form radio. In shedding light on this history, we seek to open previously neglected scholarly discourse on the history of Free-Form FM radio. 相似文献