Validity of the activPAL and Height-Adjusted Curvilinear Cadence-METs Equations in Healthy Adults

ABSTRACT

The activPAL is a widely-used measure of sedentary time but few studies have evaluated its ability to estimate physical activity intensity. This study determined the accuracy of the algorithm used by the activPAL to predict metabolic equivalents (METs) from cadence and a curvilinear cadence-METs equation individualized for height. Thirty-six healthy adults (25 ± 6 years) completed a progressive walking protocol. Stepping cadence was video recorded and METs were determined via indirect calorimetry. Manually-counted cadence was input into the activPAL and curvilinear equations. The internal activPAL equation overpredicted METs at slower cadences (<120 steps/minute) but underpredicted METs at faster cadences (>120 step/minute) (proportional bias, p < .001). Conversely, the curvilinear equation exhibited neither fixed (p = .37) nor proportional bias (p = .07), and a lower absolute MET difference [0.87 ± 0.65 (range:0.0–3.2) vs. 0.56 ± 0.45 (range:0.0–2.7) METs]. The linear activPAL equation poorly estimates METs from stepping cadence but these inaccuracies may be lessened through the use of an individualized curvilinear equation.     

Stepping Out of the Box: Rethinking the Failure of ICT to Transform Schools

Despite initial certainty ofpolitical purpose and considerable optimismregarding its effects on teaching and learning,the evidence of school inspector reports in theUSA, Scotland and England suggests thatinformation and communications technology (ICT)remains, at the beginning of the 21stCentury, a marginal force in the education of5–12 year-olds. Explanations for this havetypically been sought in analyses, byresearchers working in the `mainstream' ofschools and teacher education adopting anessentially rational or hyper-rational approachand focusing on inadequacies in resourcing,curriculum policy and training. Yet, othercurriculum changes have taken place despitecomparable barriers; teachers have made themwork. Consequently, it is not possible toexclude the potential for explanation which maylie beyond the essentially rational, systematicand structural arguments offered so far.Alternative avenues explored here include thesocial anthropological concepts of symbol,language, ideology, ritual and myth applied to20th-Century cycles of educational change, thesociological concept of subculture and humancomputer interaction (HCI) theory and models oftechnology acceptance.     

The IDEA Model as a Best Practice for Effective Instructional Risk and Crisis Communication

This study presents the IDEA (internalization, distribution, explanation, action) model as an easy-to-use and situationally generalizable framework for quickly developing effective messages instructing people on how to protect themselves before and during high-risk events, crises, disasters, and other emergencies. The model consists of four elements: helping message recipients internalize the potential impact of the risk or crisis event, identifying appropriate channels and strategies for distributing the risk or crisis event messages, offering a brief and intelligible explanation of the nature of the risk or crisis, and providing specific self-protective action steps for people to take. The model may be used to design messages in any risk, crisis, or emergency context. Through a posttest-only quasi-experimental cross-sectional research experiment, this study measured the perceived message effectiveness, cognitive understanding, and behavioral intentions of those viewing a television news story about a crisis situation employing the IDEA model compared to those viewing a similar story replicating typical crisis event news stories delivered to general publics. This comparative examination revealed that the message designed according to the IDEA model was significantly more effective than the status quo message and resulted in greater behavioral intentions to engage in appropriate self-protective actions in the event of an acute risk or crisis situation. Strategies for implementing the model are also provided.     

The relationship between game-based performance indicators and developmental level in junior Australian football: Implications for coaching

Identifying performance differences between juniors at different stages of a talent pathway may assist with the development of prospective talent. This study investigated the relationship between game-based performance indicators and developmental level in junior Australian football (AF). Players were categorised into 2 groups according to developmental level; U16 and U18. Physical and technical skill performance indicators were collated for all U16 (n = 200) and U18 (n = 244) participants of their respective 2014 national championships. Data were acquired from all 28 games (12 U16, 16 U18); resulting in 1360 player observations (568 U16, 792 U18). Microtechnology and a commercial provider facilitated the quantification of 15 performance indicators. Generalised estimating equations (GEEs) modelled the extent to which these performance indicators were associated with developmental level. The GEE model revealed that “contested marks” and “contested possessions” had the strongest association with the U16 level, while “total marks” and “clearances” had the strongest association with the U18 level. The remaining performance indicators were not developmentally discriminant. These results indicate that there are distinctive features of gameplay more associated with the U16 and U18 levels in AF. Coaches may wish to consider these results when constructing training drills designed to minimise developmental gaps.     

How changes in work structure influence employees’ perceptions of CSR: millionaire managers and locked-out laborers

Corporate social responsibility (CSR) is widely understood as the various activities corporations engage in to meet stakeholder demands and demonstrate fit in society. Often employees are positioned as the beneficiaries of corporate largesse and worker recruitment and retention are offered as rationale for CSR activities. The voice of the employee, however, is noticeably missing from the CSR literature. This study uses a case study approach to explore how locked-out union workers define CSR. We conducted 51 semi-structured interviews and analyzed 27 secondary data sources. The results suggest that workers fuse together economic and ethical responsibilities to develop a portrait of their employer's CSR. Workers defined CSR as an economic/ethical responsibility that is intimately tied to a set of explicitly and implicitly communicated values. Our analysis exposed four additional dimensions that informed employees’ understanding of CSR: reciprocity, fair treatment, economic justice, and organizational structure. Propositions for future research and practical implications are offered based on the findings.