Developing a framework for assessing muscle effort and postures during computer work in the field: the effect of computer activities on neck/shoulder muscle effort and postures

The present study, a part of the PROOF (PRedicting Occupational biomechanics in OFfice workers) study, aimed to determine whether trapezius muscle effort was different across computer activities in a field study of computer workers, and also investigated whether head and shoulder postures were different across computer activities. One hundred twenty participants were measured continuously for two hours each while performing their own computer work. Keyboard activities were associated with the highest intensity of left and right trapezius muscle efforts, and mouse activities were associated with the smallest variability in left and right trapezius muscle efforts. Corresponding trends in head and shoulder postures included that the greatest head flexion and left and right shoulder internal rotation was observed during keyboard activities, and that the smallest variability in head flexion, head lateral tilt, and right shoulder internal rotation was observed during mouse activities. Identifying which muscle efforts and postures are different across computer activities is the first essential step for developing prediction rules for muscle efforts and postures, which can be used to link muscle efforts and postures to musculoskeletal symptoms in epidemiological studies.     

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Abstract

Beth Ashmore reviews The Purpose-Based Library: Finding Your Path to Survival, Success and Growth; Scott Johnson reviews Metaliteracy in Practice; Catherine Johnson reviews Teaching Information Literacy Reframed: 50+ Framework-Based Exercises for Creating Information-Literate Learners; Adolfo G. Prieto reviews Dynamic Research Support for Academic Libraries.     

Life satisfaction and desire to emigrate: What does the cross-national analysis show?

Few articles explain how life satisfaction and happiness influence intention to migrate to another country. This study fills the gap by investigating the desire to emigrate in relation to individual life satisfaction while testing for moderation effects of national life satisfaction scores, the Human Development Index and Gender Inequality Index at country level. The empirical analysis is based on the unique Gallup World Poll data for 127 countries in 2017. In line with previous research, the findings confirm a negative association between life satisfaction (both individual and country level) and the desire to emigrate. Furthermore, results point to mean country life satisfaction, human development and gender inequality levels acting as moderators of individual-level life satisfaction on the desire to emigrate. Higher aggregate life satisfaction levels act as counter-forces to individual life satisfaction, performing as enablers of stay versus move. In countries with lower human development and higher gender inequality, individual life satisfaction will act as an enabler to move. A comprehensive discussion includes findings for gender and age groups and those born or not born in the country.     

The role of source and the factors audiences rely on in evaluating credibility of health information

In the wake of public relations crises of credibility such as FEMA's staged press conference in response to the California wildfires, source credibility merits increased scholarly and practitioner scrutiny in order to maximize the effectiveness of the information practitioners release, particularly when the objective is to promote action vital to public health and well-being. Through a random national telephone survey (n = 400), this research analyzes how the source itself moderates credibility as well as the criteria important to audience evaluations of credibility. Results indicate practitioners are perceived as credible sources of health information and that audiences take a rather mindful route in their evaluations of source credibility.     

The identification of recreational counties in nonmetropolitan areas of the USA

Nonmetropolitan counties in the USA with significant concentrations of recreational activity are identified using a combination of quantitative and contextual indicators. The 285 counties identified as recreational encompass 12 percent of the nonmetropolitan counties and 15 percent of the 1990 nonmetropolitan population. Population growth in such counties has consistently exceeded that in other nonmetropolitan areas as well as that in metropolitan areas. Net migration accounted for most of the population growth in such counties during the 24 years considered. The revenue and expenditure patterns of local governments in recreational counties differs from those elsewhere suggesting significant policy concerns.     

Growing Diversity among America's Children and Youth: Spatial and Temporal Dimensions

This study documents the changing racial and ethnic mix of America's children. Specifically, we focus on the unusually rapid shifts in the composition and changing spatial distribution of America's young people between 2000 and 2008. Minorities grew to 43 percent of all children and youth, up from 38.5 percent only eight years earlier. In 1990, this figure stood at 33 percent. Among 0–4‐year‐olds, 47 percent of all children were minority in 2008. Changes in racial and ethnic composition are driven by two powerful demographic forces. The first is the rapid increase since 2000 in the number of minority children—with Hispanics accounting for 80 percent of the growth. The second is the absolute decline in the number of non‐Hispanic white children and youth. The growth of minority children and racial diversity is distributed unevenly over geographical space. Over 500 (or roughly 1 in 6) counties now have majority‐minority youth populations. Broad geographic areas of America nevertheless remain mono‐racial, where only small shares of minorities live.     

Newborn Body Perception: Sensitivity to Spatial Congruency

Studies on adults have demonstrated that the perception our own body can be manipulated by varying both temporal and spatial properties of multisensory information. While human newborns are capable of detecting the temporal synchrony of visuo‐tactile body‐related cues, it remains unknown whether they also utilise spatial information for body perception. Twenty newborns were presented with a video of an infant's face touched with a paintbrush, while their own face was touched either in the spatially congruent, or an incongruent, location. We found that newborns show a visual preference for spatially congruent synchronous events, supporting the view that newborns have a rudimentary sense of their own body.     

The structure of a micro-bat community in relation to gradients of environmental variation in a tropical urban area

We investigated patterns of community structure (species composition, foraging activity, and nightly foraging patterns) of bats in relation to gradients of environmental variation in a tropical urban area. A total of 32 sites spread equally across eight habitat types were sampled in the city of Townsville, North Queensland, Australia. Each site was sampled on 3 non-consecutive occasions using automated AnaBat systems. Eleven species were confidently identified while a possible four more were identified only to the genus level. Ordination of environmental variables measured at these sites identified two distinct environmental gradients reflecting the degree of urbanisation and foliage density. With increasing urbanisation there was a decline in species richness and total foraging activity. We used regression trees to characterise foraging preferences of each species. This analysis suggested that only one species of Mormopterus was able to exploit the resources provided by urbanisation. This species foraged in areas with higher numbers of white streetlights. The remaining species of bats preferred to forage within close proximity to natural vegetation and with low numbers of streetlights. The density of vegetation in long-established suburbs did not substantially reverse the trend for urban areas to have fewer bat species than original habitats.     

Doing Gender,Doing Surveys? Women's Gatekeeping and Men's Non‐Participation in Multi‐Actor Reproductive Surveys

Gender differences in research participation have been documented in both quantitative and qualitative studies, a pattern that is particularly pronounced in studies of reproduction. We use the National Survey of Fertility Barriers to analyze three reasons frequently used to explain men's non‐participation in reproductive research: (1) Reproduction is a sensitive subject for men, (2) reproduction is women's domain, and (3) men's unavailability due to seemingly pragmatic reasons (e.g., work schedule). Using binary logistic regression, we test these three explanations across two different models: women's gatekeeping (denying researcher access to partners) (n = 1,637) and men's own non‐response (n = 1,454). A substantial minority of women (12.8 percent), engaged in gatekeeping, but the dominant mechanism of men's non‐participation was their own non‐response once women granted researcher access to partners. Consistent with prior studies on general survey non‐response, several demographic variables were associated with men's participation. Additionally, findings suggest that the notion of reproduction as women's domain received the strongest support, though specific variables within this construct differed for models predicting women's gatekeeping versus men's non‐response of their own accord.