Improving energy expenditure estimates from wearable devices: A machine learning approach

ABSTRACT

A means of quantifying continuous, free-living energy expenditure (EE) would advance the study of bioenergetics. The aim of this study was to apply a non-linear, machine learning algorithm (random forest) to predict minute level EE for a range of activities using acceleration, physiological signals (e.g., heart rate, body temperature, galvanic skin response), and participant characteristics (e.g., sex, age, height, weight, body composition) collected from wearable devices (Fitbit charge 2, Polar H7, SenseWear Armband Mini and Actigraph GT3-x) as potential inputs. By utilising a leave-one-out cross-validation approach in 59 subjects, we investigated the predictive accuracy in sedentary, ambulatory, household, and cycling activities compared to indirect calorimetry (Vyntus CPX). Over all activities, correlations of at least r = 0.85 were achieved by the models. Root mean squared error ranged from 1 to 1.37 METs and all overall models were statistically equivalent to the criterion measure. Significantly lower error was observed for Actigraph and Sensewear models, when compared to the manufacturer provided estimates of the Sensewear Armband (p < 0.05). A high degree of accuracy in EE estimation was achieved by applying non-linear models to wearable devices which may offer a means to capture the energy cost of free-living activities.     

Dialed In: Continuous Response Measures in Televised Political Debates and Their Effect on Viewers

As a result of emerging debate formats and technological advancements over the years, the media started using continuous response measures (CRMs) in the form of on-screen trackers, allowing select audiences to rate candidate performances in political debates in 2004. Given the limited amount of scholarly research that has tackled this issue, this study aims to investigate the effect of CRMs on college students’ voting choices and perceptions of political candidates. This experimental study has found that these trackers did influence the participants’ evaluations of the political candidates shown in the debate regardless of previously stated political affiliation.     

The Structure of Phonological Processing and Its Relationship to Basic Reading

We investigated various structural models of phonological processing and the relationship of phonological processing abilities to basic reading. Data were collected on 116 kindergarten and first grade students. The specific ability model, which included phonological awareness, phonological memory, and rapid automatized naming as separate abilities, had the strongest fit to the data. Of the specific phonological processing abilities, rapid automatized naming was least associated with a second-order factor. Phonological awareness and rapid automatized naming accounted for variance in word reading, although the latter demonstrated limited practical utility. Theoretical and practical implications are discussed.     

Educational services for mentally handicapped children in Northern Ireland: A survey of provision

Abstract

Until April 1987 mentally handicapped children were legally excluded from education in Northern Ireland. Provision was made instead in special care schools administered by social services authorities. This contrasts with the position in the rest of the UK where all children have been educated in schools administered by education authorities since the early 1970s. A survey was conducted to investigate aspects of provision in special care schools. Comparative samples of special schools for children with mental handicap in England, and special schools for other categories of children with special needs in Northern Ireland were also surveyed.

Results show that the special care school pupils were disadvantaged often seriously, compared with the other samples. Staffing ratios were inferior in most respects of provision. Other resources were often criticized by head teachers as inadequate. The special care school transport system was also shown to be seriously deficient, causing the length of the school day to be reduced for a very large proportion of pupils. The inadequacies identified impinged particularly on severely and profoundly handicapped pupils, despite earlier Government arguments that the interests of this group could be damaged in a transfer to education.

Nearly one fifth of the special care school population were aged 19 and over, and nearly one third of the profoundly handicapped pupils were 19 or over. In many cases adults and children shared the same facilities.

These results are compared and contrasted with Government documents which claimed parity of provision in special care schools and special schools in England, and which adopted a stated policy of normalization in the development of services for the mentally handicapped.     

Place,matters of concern,and pedagogy: Making impactful connections with our planet

Neoliberalism, capitalist ideas, and the disastrous human-induced state of the environment are evidence of the lack of connection between humans and the earth, calling for a rethinking of the relationships between humans and the planet. As early childhood educators, we wonder about our role in rethinking these relationships and in particular, the relationship between children and planet. In this article, we articulate the actions and positioning of teachers in three different research studies and various contexts (Victoria, AUS; Oregon, USA; California, USA) utilizing Latour’s (2004) ‘matters of concern’ as a framework to rethink engagement and relationality. Each project considers how place can be a provocation that makes visible the entanglement of children, families, teachers, and the more-than-human as a way to rethink pedagogy. The limitations, tensions, and possibilities that occur within and across these entanglements are explored, highlighting how the enacted practices could disrupt dominant early childhood discourses and practices.     

The Hopkins gasolene-engine dynamometer and speedometer

It is not ordinarily a simple operation to determine the power continuously delivered by an internal combustion engine. The apparatus here described is designed to reduce the operation to the simplicity of reading the horsepower from a dial and esentially consists of a current meter whose readings are proportional to the product of the speed of rotation and the temperature of the gases within the cylinder.