Rohit Shah and Amanda Sinclair
Edited by Tricia Hubbard
Column-editor : R. Barry Dale
Jeff G. Konin, Nicole Beil and Greg Werner
Column-editor : Jeff G. Konin
Karin G.M. Gerritsen, Anton J. van den Bogert, Manuel Hulliger and Ronald F. Zernicke
The purpose of this study was to investigate, theoretically, to what extent muscle properties could contribute to recovery from perturbations during locomotion. Four models with different actuator properties were created: the FLVT model, which encompassed force-length (FL) and force-velocity (FV) characteristics of human muscles as well as muscle stimulation inputs as functions of time (T); the FLT model, which had muscles without force-velocity characteristics; the FVT model, which had muscles without specific force-length characteristics; and the MT model, which had no muscles but was driven by joint moments (M) as a function of time. Each model was exposed to static and dynamic perturbations and its response was examined. FLVT showed good resistance to both static and dynamic perturbations. FLT was resistant to static perturbation but could not counteract dynamic perturbation, whereas the opposite was found for FVT. MT could not counteract either of the perturbations. Based on the results of the simulations, skeletal muscle force-length-velocity properties, although interactively complex, contribute substantially to the dynamic stability of the musculoskeletal system.
Kathleen Benjamin, Nancy Edwards and Wenda Caswell
In 2006, the authors conducted a multisite qualitative study in Ottawa, Ontario, Canada to examine organizational and environmental factors that influence physical activity for long-term-care (LTC) residents. The article describes the results of interviews with 9 administrators from nonprofit and for-profit LTC facilities. A content analysis revealed that despite having positive views about the value of physical activity, the administrators encountered challenges related to funding, human resources, and the built (physical) environment. The intersection of staffing issues and challenges in the built environment created less than optimal conditions for physical activity programs. Findings suggest that until there are adequate human and financial resources, it will be difficult to implement evidence-informed physical activity programs for residents in LTC settings in Ontario. A review of provincial LTC standards for physical activity program requirements and the built environment is warranted.
Laura A. Hayden and Meghan Lynch
Edited by Adam Naylor
Damien Clement, Vanessa R. Shannon and Ian J. Connole
Al Petitpas, Judy Van Raalte and Ted France
Positive youth development (PYD) programs assist youth in acquiring the skills, attitudes, and values that are critical in coping with various risk factors in their communities. The purpose of this paper is to highlight strategies that sport psychology consultants can use to support PYD programs and develop collaboration and consistency of delivery among community youth serving agencies that use sport and physical activity-based experiences to promote positive youth development. In particular, the role of sport psychology consultants within sport and physical activity programs that serve as a catalyst for community youth development (CYD) is examined. Barriers to collaboration among community-based organizations are identified and strategies to overcome these obstacles are proposed. Sport psychology consultants are in a unique position to support PYD and CYD in the athletes and communities they serve.
Evelyn G. Hall and Linda K. Bunker
Thomas Curran and Martyn Standage
Motivation research is central to understanding why certain students exhibit high levels of behavioral, cognitive, and emotional engagement with learning, and why others lack interest, display boredom, and withdraw effort (i.e., are disaffected). In this review, tenets within self-determination theory (SDT) are used to provide a theoretically-informed account of student engagement and disaffection in the context of school physical education (PE). Our review centers on the proposition within SDT that the satisfaction of basic psychological needs (i.e., for autonomy, competence, and relatedness) provide the energizing basis for optimal motivational functioning and wellness. Teacher strategies and class structures are reviewed in the context of whether they satisfy or frustrate these psychological needs. To amalgamate the reviewed literature, a mediated model depicting a ‘student-teacher dialectical’ framework is presented. Several practitioner recommendations for supporting student engagement in PE are then offered. Lastly, findings of past interventions within the school context are presented and discussed.