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141.
Nicholas Tam Jordan Santos-Concejero Ross Tucker Robert P. Lamberts Lisa K. Micklesfield 《Journal of sports sciences》2018,36(4):456-461
Impact loading in athletes participating in various sports has been positively associated with increased bone mineral density (BMD), but this has not been investigated in elite Kenyan runners. Body composition and site-specific BMD measures quantified with dual x-ray absorptiometry were measured in 15 elite male Kenyan runners and 23 apparently healthy South African males of different ethnicities. Training load and biomechanical variables associated with impact loading, such as joint stiffness, were determined in the elite Kenyan runners. Greater proximal femur (PF) BMD (g · cm?2) was higher (P = 0.001, ES = 1.24) in the elite Kenyan runners compared with the controls. Six of the 15 (40%) Kenyan runners exhibited lumbar spine (LS) Z-Scores below ?2.0 SD, whereas this was not found in the apparently healthy controls. PFBMD was associated with training load (r = 0.560, P = 0.003) and ankle (r = 0.710, P = 0.004) and knee (r = 0.546, P = 0.043) joint stiffness. Elite Kenyan runners exhibit greater PFBMD than healthy controls, which is associated with higher training load and higher joint stiffness. Our results reaffirm the benefits of impact loading on BMD at a weight-bearing site, while a high prevalence of low LSBMD in the elite Kenyan runners is hypothesised to be the result of a mismatch between energy intake and high training load. Future research investigating energy availability in Kenyan runners and the possible association with musculoskeletal injury should be investigated. 相似文献
142.
Cristine Agresta Christian R. Ward W. Geoffrey Wright Carole A. Tucker 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(2):206-215
Many field sports involve equipment that restricts one or both arms from moving while running. Arm swing during running has been examined from a biomechanical and physiologic perspective but not from an injury perspective. Moreover, only bilateral arm swing suppression has been studied with respect to running. The purpose of this study was to determine the influence of running with one arm restrained on lower extremity mechanics associated with running or sport-related injury. Fifteen healthy participants ran at a self-selected speed with typical arm swing, with one arm restrained and with both arms restrained. Lower extremity kinematics and spatiotemporal measures were analysed for all arm swing conditions. Running with one arm restrained resulted in increased frontal plane knee and hip angles, decreased foot strike angle, and decreased centre of mass vertical displacement compared to typical arm swing or bilateral arm swing restriction. Stride length was decreased and step frequency increased when running with one or both arms restrained. Unilateral arm swing restriction induces changes in lower extremity kinematics that are not similar to running with bilateral arm swing restriction or typical arm swing motion. Running with one arm restrained increases frontal plane mechanics associated with risk of knee injury. 相似文献
143.
Tarkington J. Newman Melissa Kim Anita R. Tucker M. Antonio G. Alvarez 《Physical Education & Sport Pedagogy》2018,23(3):280-293
Background: Participation in youth sport is often associated with a variety of positive development outcomes. In order to effectively utilize sport as a context of learning and development, the sport must be intentionally designed and programed. One often-used approach is known as sport-based positive youth development (PYD). Recently, to further enhance the intentionality of a sport-based PYD approach, several researchers have posited the potential benefits of applying experiential learning theory to youth sport programing. Through utilizing experiential learning within a sport-based PYD approach, it is believed youth sport can be designed to intentionally promote desired PYD outcomes.Purpose: Experiential learning theory offers a deep understanding and history of effective youth programing. However, within the field of experiential learning, many different pedagogical approaches exist. To date, sport-based PYD has yet to identify a specific pedagogical approach within experiential learning. In order to be accessible and applicable for youth sport leaders, a more definitive pedagogical approach is needed. One specific application of experiential learning which offers specific programing techniques that are compatible with a sport-based PYD approach is adventure pedagogy.Conclusions: Adventure pedagogy draws from adventure-based learning and adventure-based groupwork. Thus, adventure pedagogy is defined as a participant-centered approach consisting of intentionally designed and sequenced challenging group activities, which, when processed and debriefed, can lead to a shared opportunity for growth and development related to the intrapersonal development and interpersonal skills. Specifically, to enhance the programing and practices of the youth sport leader, this paper identifies key tenets of adventure pedagogy and highlights their applicability within a sport-based PYD approach. These tenets include the promotion of PYD outcomes, physical and emotional safety, intentionally designed activities, sequencing of prescribed activities, a novel learning experiences, intentional facilitation, challenging group activities, real and immediate consequences, and debriefing to transfer learning. Through the integration of adventure and sport-based PYD, youth sport leaders can effectively program and facilitate youth sport to promote desired PYD outcomes. 相似文献
144.
145.
Loren Cordain Alan Tucker Debbie Moon Joel M. Stager 《Research quarterly for exercise and sport》2013,84(1):70-74
Abstract To determine whether respiratory muscle strength is related to pulmonary volume differences in athletes and nonathletes, 11 intercollegiate female swimmers, 11 female cross-country runners, and two nonathletic control groups, matched to the athletes in height and age, were evaluated for pulmonary parameters including maximal inspiratory pressure (Plmax) and maximal expiratory pressure (PEmax). Swimmers exhibited larger (p < .05) vital capacities (VC), residual lung volumes (RV), inspiratory capacities (IC), and functional residual capacities (FRC) than both the runners or the controls but no difference (p > .05) in either Plmax or inspiratory flow (FIV25%-75%). Timed expiratory volumes (FEV Q.5 m and FEV1.0 were significantly (p < .05) lower in the swimmers than in the controls. These data suggest that an adaptational growth may be responsible, in part, for the augmented static lung volumes demonstrated in swimmers 相似文献
146.
Charles O. Tucker 《Communication Studies》2013,64(3):212-221
Given the premise that the university level faculty committee system is an important element of academic policy‐making, this article reports an effort to describe the communication patterns which control the policies which are and are not “made by faculty committees. 相似文献
147.
To determine whether respiratory muscle strength is related to pulmonary volume differences in athletes and nonathletes, 11 intercollegiate female swimmers, 11 female cross-country runners, and two nonathletic control groups, matched to the athletes in height and age, were evaluated for pulmonary parameters including maximal inspiratory pressure (PImax) and maximal expiratory pressure (PEmax). Swimmers exhibited larger (p less than .05) vital capacities (VC), residual lung volumes (RV), inspiratory capacities (IC), and functional residual capacities (FRC) than both the runners or the controls but no difference (p greater than .05) in either PImax or inspiratory flow (FIV 25%-75%). Timed expiratory volumes (FEV 0.5 and FEV 1.0) were significantly (p less than .05) lower in the swimmers than in the controls. These data suggest that an adaptational growth may be responsible, in part, for the augmented static lung volumes demonstrated in swimmers. 相似文献
148.
Nicholas Tucker 《Children‘s Literature in Education》1995,26(4):219-229
Nicholas Tucker taught English in comprehensive schools in London before qualifying as an educational psychologist. He is now a lecturer in developmental psychology at the University of Sussex, with a special interest both in children's reactions to literature and in the history and present-day status of childhood itself. He has written five books for children as well as books about children's literature, includingThe Child and the Book: A Literary and Psychological Exploration, reissued in 1990 by Cambridge University Press in their new Canto “Classics” series. 相似文献
149.
Amudha S. Poobalan Emma Pitchforth Mari Imamura Janet S. Tucker Kate Philip Jenny Spratt 《Sex education》2013,13(3):319-336
The purpose of this paper is to conduct a review of reviews to identify characteristics of effective sex and relationship education (SRE) interventions and/or programmes in young people to improve sexual health and identify barriers and facilitators for implementation. Six bibliographic databases were searched from 1986 to 2006 for systematic reviews that assessed SRE interventions or programmes in participants between 10 and 18 years old and their partners. All outcomes of improvement in sexual health were assessed and 30 systematic reviews were included. Effective interventions and/or programmes tended to be those targeting younger age groups before they become sexually active, focused interventions tailored to the physical and biological development stages, theory based, and abstinence education programmes that incorporate values of relationships and provide skills training and links to contraceptive services. Adequate training of personnel delivering the interventions and culturally sensitive programmes were identified as important facilitators of effectiveness. Future research should explore the appropriate age for initiating sex education and investigate targeting specific behaviour compared with multiple-outcome targeting. Research exploring the reasons for interventions focusing on specific populations (i.e. African and Hispanic origins), even if they were conducted in countries dominated by Caucasians, is warranted. 相似文献
150.
Drawing upon a post-structural ethnography of boys’ constructions of gendered and sexual identities in one South African high school, this paper empirically seeks to theorise how 20 Grade 8 boys, identified as The Jokers, The Achievers, The Outcasts and The Average Ou's, simultaneously seek out spaces in male peer culture to cultivate, police and challenge hegemonic notions of masculinity. The paper illustrates the construction and positioning of masculinities across spaces of conflict, more particularly, the personal and social resources reproduced by boys in the pursuit of ‘desirable’ masculinities across experiences of interpersonal conflict, punishment, friendship and play. Given the nature of these identity struggles in school boy peer culture, this paper highlights the need for fostering and maintaining peer conversational spaces where boys and girls are challenged to actively deconstruct prevailing gendered identities and work towards more expansive definitions of self. 相似文献