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Clark R Dickerson, Talia Alenabi, Bernard J Martin, Don B Chaffin
This study aimed to compare the activity of four shoulder muscles in individuals with low back pain (LBP), spinal cord injuries (SCI) and a control group, during one-handed load transfer trials. Nine individuals with minimum one-year of LBP, eleven with thoracic/lumbar SCI and nine healthy controls participated in this study. The activations of anterior deltoid, upper trapezius, infraspinatus and pectoralis major were recorded by surface EMG during one-handed transferring of a cylinder from a home shelve to six spatially distributed target shelves...
March 8, 2018: Ergonomics
Mareike Heinzen, Eugenia Cacciatori, Frank A Zoller, Roman Boutellier
Although several studies have examined the impact of open workspaces, there is still an on-going debate about its advantages and disadvantages. Our paper contributes to this debate by shedding light on three issues: the effect of open workspaces on (1) the flow of communication along and across hierarchical lines; (2) the content of communication; and (3) the specificities of open integrated laboratories. Our findings derive from a longitudinal case in a large pharmaceutical company that has relocated some R&D teams from enclosed to multi-space offices and labs...
March 6, 2018: Ergonomics
Fiona Wixted, Mark Shevlin, Leonard W O' Sullivan
As a result of changes in manufacturing including an upward trend in automation and the advent of the fourth industrial revolution, the requirement for supervisory monitoring and consequently, cognitive demand has increased in automated manufacturing. The incidence of musculoskeletal disorders has also increased in the manufacturing sector. A model was developed based on survey data to test if distress and worry mediate the relationship between psychosocial factors (job control, cognitive demand, social isolation and skill discretion), stress states and symptoms of upper body musculoskeletal disorders in highly automated manufacturing companies (n=235)...
March 5, 2018: Ergonomics
Jeannette Østergaard Penny, Merete Brink Speedtsberg, Thomas Kallemose, Jesper Bencke
The study sought to investigate whether an orthotic stiletto could modulate the pressure and comfort under the forefoot, arch and heel that stiletto wearers experience. Twenty-two women participated. We measured the peak pressure and pressure-time integral for orthotic stilettos with built-in metatarsal pad, heel cup and arch support; standard stilettos without inlays; and trainers. Comfort was recorded during 3x3 working days. The orthotic stiletto exhibited lower metatarsal head1 (MTH) and MTH2+3 and heel pressures than the standard stiletto (p < ...
March 2, 2018: Ergonomics
Michelle Bedolla
No abstract text is available yet for this article.
February 28, 2018: Ergonomics
Daniel Martin, Jim Nixon
Controllers and pilots must work together to ensure safe and efficient helicopter flight within the London control zone. Subjective ratings of pilot perception of controller responsibility for five key flight tasks were obtained from thirty helicopter pilots. Three types of airspace were investigated. Results indicate that there is variation in pilot understanding of controller responsibility compared to the formal regulations that define controller responsibility. Significant differences in the perception of controller responsibility were found for the task of aircraft separation in class D airspace and along helicopter routes...
February 21, 2018: Ergonomics
Kannan Anil Kumar, Matthew B Parkinson
When designing products and environments, detailed data on body size and shape are seldom available for the specific user population. One way to mitigate this issue is to reweight available data such that they provide an accurate estimate of the target population of interest. This is done by assigning a statistical weight to each individual in the reference data, increasing or decreasing their influence on statistical models of the whole. This paper presents a new approach to reweighting these data. Instead of stratified sampling, the proposed method uses a clustering algorithm to identify relationships between the detailed and reference populations using their height, mass, and body mass index (BMI)...
February 20, 2018: Ergonomics
Ella-Mae Hubbard
No abstract text is available yet for this article.
February 20, 2018: Ergonomics
Amir Baghdadi, Fadel M Megahed, Ehsan T Esfahani, Lora A Cavuoto
The purpose of this study is to provide a method for classifying non-fatigued versus fatigued states following manual material handling. A method of template matching pattern recognition for feature extraction (1$ Recognizer) along with the support vector machine (SVM) model for classification were applied on the kinematics of gait cycles segmented by our stepwise search-based segmentation algorithm. A single inertial measurement unit (IMU) on the ankle was used, providing a minimally intrusive and inexpensive tool for monitoring...
February 16, 2018: Ergonomics
Julia L Wright, Jessie Y C Chen, Michael J Barnes
In a human-automation interaction study, automation assistance level (AL) was investigated for its effects on operator performance in a dynamic, multi-tasking environment. Participants supervised a convoy of manned and unmanned vehicles traversing a simulated environment in three AL conditions, while maintaining situation awareness and identifying targets. Operators' situation awareness, target detection performance, workload, and individual differences were evaluated. Results show increasing AL generally improved task performance and decreased perceived workload, however differential effects due to operator spatial ability and perceived attentional control were found...
February 16, 2018: Ergonomics
Franziska Hartwich, Matthias Beggiato, Josef F Krems
Automated driving has the potential to improve the safety and efficiency of future traffic and to extend elderly peoples' driving life, provided it is perceived as comfortable and joyful and is accepted by drivers. Driving comfort could be enhanced by familiar automated driving styles based on drivers' manual driving styles. In a two-stage driving simulator study, effects of driving automation and driving style familiarity on driving comfort, enjoyment, and system acceptance were examined. Twenty younger and twenty older drivers performed a manual and four automated drives of different driving style familiarity...
February 16, 2018: Ergonomics
Roger Haslam, Andrew Thatcher
No abstract text is available yet for this article.
February 8, 2018: Ergonomics
Nicole E Werner, Anna F Jolliff, Gail Casper, Thomas Martell, Kevin Ponto
Managing chronic illness requires personal health information management (PHIM) to be performed by lay individuals. Paramount to understanding the PHIM process is understanding the sociotechnical system in which it frequently occurs: the home environment. We combined distributed cognition theory and the patient work system model to investigate how characteristics of the home interact with the cognitive work of PHIM. We used a 3D virtual reality CAVE that enabled participants who had been diagnosed with diabetes (N=20) to describe how they would perform PHIM in the home context...
February 6, 2018: Ergonomics
M C Emre Simsekler, James R Ward, P John Clarkson
Current risk identification practices applied to patient safety in healthcare are insufficient. The situation can be improved, however, by studying systems approaches broadly and successfully utilised in other safety-critical industries, such as aviation and chemical industries. To illustrate this, this paper first investigates current risk identification practices in the healthcare field, and then examines the potential of systems approaches. A systems-based approach, called the Risk Identification Framework (RID Framework), is then developed to enhance improvement in risk identification...
February 2, 2018: Ergonomics
Richelle Baker, Pieter Coenen, Erin Howie, Jeremy Lee, Ann Williamson, Leon Straker
Due to concerns about excessive sedentary exposure for office workers, alternate work positions such as standing are being trialled. However, prolonged standing may have health and productivity impacts, which this study assessed. Twenty adult participants undertook two hours of laboratory-based standing computer work to investigate changes in discomfort and cognitive function, along with muscle fatigue, movement, lower limb swelling and mental state. Over time, discomfort increased in all body areas (total body IRR[95% confidence interval]: 1...
February 1, 2018: Ergonomics
Giulia Patelli, Miyuki Morioka, Michael J Griffin
The frequency content of a mechanical shock is not confined to its fundamental frequency, so it was hypothesized that the frequency-dependence of discomfort caused by shocks with defined fundamental frequencies will differ from the frequency-dependence of sinusoidal vibration. Subjects experienced vertical vibration and vertical shocks with fundamental frequencies from 0.5 to 16 Hz and magnitudes from ±0.7 to ±9.5 ms-2. The rate of growth of discomfort with increasing magnitude of motion decreased with increasing frequency of both motions, so the frequency-dependence of discomfort varied with the magnitudes of both motions and no single frequency weighting will be ideal for all magnitudes...
January 17, 2018: Ergonomics
Shabboo Valipoor, Debajyoti Pati, Matt S Stock, Doug Bazuin
A vast majority of patient fall events in hospitals involve the elderly. In inpatient care settings, despite the risk of fall, patients are encouraged to leave their bed, move around their room, and sit on their chair to progress in their healing. Despite the vital role of patient chair design in improving recovery, few studies have examined the ergonomic requirements of safe patient chairs. This study examined the impact of manipulating horizontal and vertical positions of armrests in a test chair on required physical effort during Stand-to-Sit-to-Stand (St-Si-St) transitions among fifteen elderly women...
January 11, 2018: Ergonomics
Andreas Gregoriades, Alistair Sutcliffe
Situation awareness (SA) constitutes a critical factor in road safety, strongly related to accidents. This paper describes the evaluation of a proposed SA enhancement system (SAES) that exploits augmented reality through a head-up display. Two SAES designs were evaluation (information rich v. minimal information) using a custom-made simulator and the Situation Awareness Global Assessment Technique (SAGAT) with performance and EEG measures. The paper describes the process of assessing the SA of drivers using the SAES, through a series of experiments with participants in a Cave Automatic Virtual Environment (CAVE)...
January 11, 2018: Ergonomics
Yue Wei, Jiayue Zheng, Richard H Y So
Visually induced motion sickness (VIMS) is a common discomfort response associated with vection-provoking stimuli. It is suggested that VIMS susceptibility depends on the ability to regulate visual performance during vection. To test this, in total 29 participants, with VIMS susceptibility assessed by Motion Sickness Susceptibility Questionnaire, were recruited in three successive experiments to perform sustained attention to response tests (SARTs) while watching dot pattern stimuli known to provoke roll-vection...
January 11, 2018: Ergonomics
Linda M Rose, Catherine A A Beauchemin, W Patrick Neumann
This study's objective was to develop models of endurance time (ET), as a function of load level (LL), and of resumption time (RT) after loading as a function of both LL and loading time (LT) for repeated loadings. Ten male participants with experience in construction work each performed fifteen different one-handed repetaed pushing tasks at shoulder height with varied exerted force and duration. This data was used to create regression models predicting ET and RT. It is concluded that power law relationships are most appropriate to use when modelling ET and RT...
January 11, 2018: Ergonomics
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