Adolescent physical activity levels: discrepancies with accelerometer data analysis     

Greig R.M. Logan  Scott Duncan  Nigel K. Harris  Erica A. Hinckson  Grant Schofield 《Journal of sports sciences》2016,34(21):2047-2053

This study investigated the effects of epoch length and cut point selection on adolescent physical activity intensity quantification using vertical axis and vector magnitude (VM) measurement with the ActiGraph GT3X+ accelerometer. Four hundred and nine adolescents (211 males; 198 females) aged 12–16 years of age wore accelerometers during waking hours. The GT3X+ acceleration counts were reintegrated into 1, 5, 15, 30 and 60 s epoch lengths for both vertical axis and VM counts. One cut point was applied to vertical axis counts and three different cut points were applied to VM counts for each epoch length. Significant differences (P < 0.01) in mean total counts per day were observed between vertical axis and VM counts, and between epoch lengths for VM only. Differences in physical activity levels were observed between vertical and VM cut points, and between epoch lengths across all activity intensities. Our findings illustrate the magnitude of differences in physical activity outcomes that occur between axis measurement, cut points and epoch length. The magnitude of difference across epoch length must be considered in the interpretation of accelerometer data and seen as a confounding variable when comparing physical activity levels between studies.  相似文献   

Effects of increasing and decreasing physiological arousal on anticipation timing performance during competition and practice     

Michael J. Duncan  Mike Smith  Elizabeth Bryant  Emma Eyre  Kathryn Cook  Joanne Hankey 《European Journal of Sport Science》2016,16(1):27-35

The aim of this study was to investigate if the effects of changes in physiological arousal on timing performance can be accurately predicted by the catastrophe model. Eighteen young adults (8 males, 10 females) volunteered to participate in the study following ethical approval. After familiarisation, coincidence anticipation was measured using the Bassin Anticipation Timer under four incremental exercise conditions: Increasing exercise intensity and low cognitive anxiety, increasing exercise intensity and high cognitive anxiety, decreasing exercise intensity and low cognitive anxiety and decreasing exercise intensity and high cognitive anxiety. Incremental exercise was performed on a treadmill at intensities of 30%, 50%, 70% and 90% heart rate reserve (HRR) respectively. Ratings of cognitive anxiety were taken at each intensity using the Mental Readiness Form 3 (MRF3) followed by performance of coincidence anticipation trials at speeds of 3 and 8 mph. Results indicated significant condition × intensity interactions for absolute error (AE; p = .0001) and MRF cognitive anxiety intensity scores (p = .05). Post hoc analysis indicated that there were no statistically significant differences in AE across exercise intensities in low–cognitive anxiety conditions. In high–cognitive anxiety conditions, timing performance AE was significantly poorer and cognitive anxiety higher at 90% HRR, compared to the other exercise intensities. There was no difference in timing responses at 90% HRR during competitive trials, irrespective of whether exercise intensity was increasing or decreasing. This study suggests that anticipation timing performance is negatively affected when physiological arousal and cognitive anxiety are high.  相似文献   

Using generational theory to rethink teaching in higher education     

Allison A. Buskirk-Cohen  Tisha A. Duncan  Margaret Levicoff 《Teaching in Higher Education》2016,21(1):25-36

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Book Discussion     

Charles E. Merriam's Book  Henry P. Chandler  S. J. Duncan‐Clark  Louis L. Mann 《Religious education (Chicago, Ill.)》2013,108(8)

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The Mediation of Spectator Sport     

Margaret Carlisle Duncan  Barry Brummett 《Research quarterly for exercise and sport》2013,84(2):168-177

Abstract

This study employs the theory of “media logic” and the method of hermeneutical criticism to demonstrate some effects of a major social institution, television, on the “text” of experiencing spectator sports. The study finds that the medium of television makes spectator sports into an experience which incorporates narrative, intimacy, commodification, and rigid time segmentation. The conventions imposed by television on spectator sports are presented here as powerfully affecting the meanings which televised sports have for their audiences.  相似文献   

How Much Walking Is Needed To Improve Cardiorespiratory Fitness? An Examination of the 2008 Physical Activity Guidelines for Americans     

Stephen D. Anton  Glenn E. Duncan  Marian C. Limacher  Anthony D. Martin  Michael G. Perri 《Research quarterly for exercise and sport》2013,84(2):365-370

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Diversity and Design: Understanding Hidden Consequences     

Krista Aldrich 《Technical Communication Quarterly》2019,28(1):95-98

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Making memories available: a framework for preserving rural heritage through community knowledge management (cKM)     

Duncan?ShawEmail author  Graham?McGregor 《知识管理研究与实践》2010,8(2):121-134

While most of the research in Knowledge Management (KM) has focused on business communities, there is a breadth of potential applications of KM theory and practice to wider society. This paper explores the potential of KM for rural communities, specifically for those that want to preserve their social history and collective memories (what we call heritage) to enrich the lives of others. In KM terms, this is a task of accumulating and recording knowledge (using KM techniques such as story-telling and communities of practice) to enable its retention for future use (by interested people perhaps through KM systems). We report a case study of Cardrona, a valley of approximately 120 people in New Zealand's South Island. Realising that time would erode knowledge of their community a small, motivated group of residents initiated a KM programme to create a legacy for a wider community including younger generations, tourists and scholars. This paper applies KM principles to rural communities that want to harness their collective knowledge for wider societal gain, and develops a community-based framework to inform such initiatives. As a result, we call for a wider conceptualisation of KM to include motives for managing knowledge beyond business performance to accommodate community (cKM).  相似文献   

A scotsman listens to Americans     

John M. Duncan 《Quarterly Journal of Speech》2013,99(4)

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The University: Industry Interface in the Generation of Intellectual Property     

John F. Pickering  Duncan N. Matthews  Caroline Wilson  & John Kirkland 《Higher Education Quarterly》1999,53(1):6-28

This involves effective relations with the corporate sector, within an adaptive, evolving, bargaining framework. Based on an extensive interview programme, this paper explores the nature of that relationship in the context of the organisation and objectives of both partners and in the light of the developing competitive environment. It identifies the key elements on which bargaining tends to be focused and, in the light of organisational and market analysis which is ultimately developed into a bargaining model, offers predictions as to the likely outcomes of the bargaining.  相似文献