The effect of acute aerobic exercise on central arterial stiffness,wave reflections,and hemodynamics in adults with diabetes: A randomized cross-over design

BackgroundIndividuals with diabetes have greater central arterial stiffness, wave reflections, and hemodynamics, all of which promote the accelerated cardiovascular pathology seen in this population. Acute aerobic exercise has been shown to be an effective strategy for reducing central arterial stiffness, wave reflections, and hemodynamics in healthy individuals; however, the effects of acute aerobic exercise in reducing these outcomes is not well established in people with diabetes. Recently, implementation of high-intensity interval exercise (HIIE) has shown superior improvements in cardiovascular health outcomes when compared to traditional aerobic exercise. Yet, the effect of HIIE on the aforementioned outcomes in people with diabetes is not known. The purpose of this study was to (i) describe the central arterial stiffness, wave reflections, and hemodynamic responses to a bout of HIIE and moderate-intensity continuous exercise (MICE) in adults with diabetes; and (ii) compare the effects of HIIE and MICE on the aforementioned outcomes.MethodsA total of 24 adult men and women (aged 29–59 years old) with type 1 (n = 12) and type 2 (n = 12) diabetes participated in a randomized cross-over study. All participants completed the following protocols: (i) HIIE: cycling for 4 × 4 min at 85%–95% of heart rate peak (HR_peak), interspersed with 3 min of active recovery at 60%–70%HR_peak; (ii) MICE: 33 min of continuous cycling at 60%–70%HR_peak; and (iii) control (CON): lying quietly in a supine position for 30 min.ResultsA significant group × time effect was found for changes in central systolic blood pressure (F = 3.20, p = 0.01) with a transient reduction for the HIIE group but not for the MICE or CON groups. There was a significant group × time effect for changes in augmentation index at a heart rate of 75 beats/min (F = 2.32, p = 0.04) with a decrease following for HIIE and MICE but not for CON. For all other measures of central arterial stiffness and hemodynamics, no significant changes were observed (p > 0.05).ConclusionA bout of HIIE appears to lead to a greater transient reduction in central systolic blood pressure than the reduction observed following MICE; however, both HIIE and MICE improved augmentation index at a heart rate of 75 beats/min in people with diabetes. There was no significant difference in response to HIIE and MICE in all outcomes. This provides preliminary evidence on the role of HIIE on such outcomes in people with diabetes.     

Cognitive development of intellectually gifted: A Piagetian perspective

This article explores some of the materials prepared for parents of gifted children and examines the explanatory language and concepts used in terms of their potential for shaping parental attitudes and affecting the adjustment of gifted children. The author argues that the conceptual frameworks used to explain giftedness, nongiftedness and the nature of differences have powerful effects on societal and educational attitudes, including the willingness to provide differentiated services for gifted children. A strong plea is made for professional sensitivity and responsibility in describing giftedness in ways that do not isolate gifted children or their parents and which potentiate shared advocacy with other educational advocacy groups.     

A conceptual change approach to staff development: A model for programme design

With the rapid expansion in tertiary education in the past decade, coupled with the rising emphasis on accountability, teaching quality has become an important issue in higher education worldwide. The increasing emphasis on quality has placed new demands on staff development, in particular to find promising models and methodologies that will guide development approaches. The paper describes an innovative approach to staff development that was synthesized from four theories about conceptual change or change in general. This conceptual change approach is based on the hypothesis that changing teachers' conceptions of teaching towards more elaborated levels will bring about improvement in their teaching practices. A short course derived from this model is outlined.     

Complicity and control in the workplace: a critical case study of TQM,learning, and the management of knowledge

This article analyses how a Total Quality Management process with an embedded workplace literacy programme was implemented in an industrial manufacturing plant. Designed as an insider/outsider team research project, data were collected through interviews with management personnel, education and training providers, and hourly workers. Findings reveal that the Total Quality Management process and the literacy programme were implemented under the guise of providing education and training for workers, but were driven by corporate policy to reduce labour costs. The study also examines the way in which adult education was complicit in controlling workplace knowledge.