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Applied Ergonomics

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https://www.readbyqxmd.com/read/28601190/psychological-and-physiological-human-responses-to-simulated-and-real-environments-a-comparison-between-photographs-360%C3%A2-panoramas-and-virtual-reality
#1
Juan Luis Higuera-Trujillo, Juan López-Tarruella Maldonado, Carmen Llinares Millán
Psychological research into human factors frequently uses simulations to study the relationship between human behaviour and the environment. Their validity depends on their similarity with the physical environments. This paper aims to validate three environmental-simulation display formats: photographs, 360° panoramas, and virtual reality. To do this we compared the psychological and physiological responses evoked by simulated environments set-ups to those from a physical environment setup; we also assessed the users' sense of presence...
June 7, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28599798/determination-of-optimal-shoe-fitting-for-children-tennis-players-effects-of-inner-shoe-volume-and-upper-stiffness
#2
Alexis Herbaut, Maxime Roux, Nils Guéguen, Pascale Chavet, Franck Barbier, Emilie Simoneau-Buessinger
The purpose of this study was to determine the optimal inner-shoe volume for children tennis players. Sixteen participants, aged from 8 to 12 years old assessed comfort of 6 shoes, which were a combination of 3 lasts (thin, medium and wide) and 2 upper constructions (flexible and stiff), while a sock equipped with textile sensors was measuring the pressure applied on their foot. The thin last was based on the proportion of an adult last. The widest shoes produced the lowest pressure on the 1st and 5th metatarsal heads, the medial midfoot and the medial and lateral heel (p < 0...
June 6, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28528627/physical-risk-factors-identification-based-on-body-sensor-network-combined-to-videotaping
#3
Nicolas Vignais, Fabien Bernard, Gérard Touvenot, Jean-Claude Sagot
The aim of this study was to perform an ergonomic analysis of a material handling task by combining a subtask video analysis and a RULA computation, implemented continuously through a motion capture system combining inertial sensors and electrogoniometers. Five workers participated to the experiment. Seven inertial measurement units, placed on the worker's upper body (pelvis, thorax, head, arms, forearms), were implemented through a biomechanical model of the upper body to continuously provide trunk, neck, shoulder and elbow joint angles...
May 18, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28499555/evaluating-biomechanics-of-user-selected-sitting-and-standing-computer-workstation
#4
Michael Y Lin, Ana Barbir, Jack T Dennerlein
A standing computer workstation has now become a popular modern work place intervention to reduce sedentary behavior at work. However, user's interaction related to a standing computer workstation and its differences with a sitting workstation need to be understood to assist in developing recommendations for use and set up. The study compared the differences in upper extremity posture and muscle activity between user-selected sitting and standing workstation setups. Twenty participants (10 females, 10 males) volunteered for the study...
May 9, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28483058/experimental-evaluation-of-a-novel-robotic-hospital-bed-mover-with-omni-directional-mobility
#5
Zhao Guo, Rachael Bei Yee, Kyung-Ryoul Mun, Haoyong Yu
Bed pushing during patient transfer is one of the most physically demanding and yet common tasks in the hospital setting. Powered bed movers have been increasingly introduced to hospitals to reduce physiological strains on the users. This study introduces and quantifies the manpower efficiency and health benefits of a novel robotic-assisted omni-directional hospital bed transporter (SESTO Bed Mover) in comparison with a conventional manual transport stretcher (Stryker Trauma Stretcher 1037) and a powered transport stretcher (HOSPIMEK HMPT 740), which has a fifth powered wheel providing power assistance only in the forward direction...
May 5, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28477843/development-and-validation-of-an-easy-to-use-risk-assessment-tool-for-cumulative-low-back-loading-the-lifting-fatigue-failure-tool-lifft
#6
Sean Gallagher, Richard F Sesek, Mark C Schall, Rong Huangfu
Recent evidence suggests that musculoskeletal disorders (MSDs) may be the result of a fatigue failure process in affected tissues. This paper describes a new low back exposure assessment tool (the Lifting Fatigue Failure Tool [LiFFT]), which estimates a "daily dose" of cumulative loading on the low back using fatigue failure principles. Only three variables are necessary to derive the cumulative load associated with a lifting task: the weight of the load, the maximum horizontal distance from the spine to the load, and the number of repetitions for tasks performed during the workday...
May 3, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28420483/an-evaluation-of-wearable-sensors-and-their-placements-for-analyzing-construction-worker-s-trunk-posture-in-laboratory-conditions
#7
Wonil Lee, Edmund Seto, Ken-Yu Lin, Giovanni C Migliaccio
This study investigates the effect of sensor placement on the analysis of trunk posture for construction activities using two off-the-shelf systems. Experiments were performed using a single-parameter monitoring wearable sensor (SPMWS), the ActiGraph GT9X Link, which was worn at six locations on the body, and a multi-parameter monitoring wearable sensor (MPMWS), the Zephyr BioHarness™3, which was worn at two body positions. One healthy male was recruited and conducted 10 experiment sessions to repeat measurements of trunk posture within our study...
April 15, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28420482/detection-of-driver-drowsiness-using-wearable-devices-a-feasibility-study-of-the-proximity-sensor
#8
Jibo He, William Choi, Yan Yang, Junshi Lu, Xiaohui Wu, Kaiping Peng
BACKGROUND: Drowsiness is one of the major factors that cause crashes in the transportation industry. Drowsiness detection systems can alert drowsy operators and potentially reduce the risk of crashes. In this study, a Google-Glass-based drowsiness detection system was developed and validated. METHODS: The proximity sensor of Google Glass was used to monitor eye blink frequency. A simulated driving study was carried out to validate the system. Driving performance and eye blinks were compared between the two states of alertness and drowsiness while driving...
April 15, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28395855/assessing-the-use-of-immersive-virtual-reality-mouse-and-touchscreen-in-pointing-and-dragging-and-dropping-tasks-among-young-middle-aged-and-older-adults
#9
Jiayin Chen, Calvin Or
This study assessed the use of an immersive virtual reality (VR), a mouse and a touchscreen for one-directional pointing, multi-directional pointing, and dragging-and-dropping tasks involving targets of smaller and larger widths by young (n = 18; 18-30 years), middle-aged (n = 18; 40-55 years) and older adults (n = 18; 65-75 years). A three-way, mixed-factorial design was used for data collection. The dependent variables were the movement time required and the error rate. Our main findings were that the participants took more time and made more errors in using the VR input interface than in using the mouse or the touchscreen...
April 7, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28395854/using-the-microsoft-kinect%C3%A2-to-assess-3-d-shoulder-kinematics-during-computer-use
#10
Xu Xu, Michelle Robertson, Karen B Chen, Jia-Hua Lin, Raymond W McGorry
Shoulder joint kinematics has been used as a representative indicator to investigate musculoskeletal symptoms among computer users for office ergonomics studies. The traditional measurement of shoulder kinematics normally requires a laboratory-based motion tracking system which limits the field studies. In the current study, a portable, low cost, and marker-less Microsoft Kinect™ sensor was examined for its feasibility on shoulder kinematics measurement during computer tasks. Eleven healthy participants performed a standardized computer task, and their shoulder kinematics data were measured by a Kinect sensor and a motion tracking system concurrently...
April 7, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610816/egocentric-distance-perception-and-performance-of-direct-pointing-in-stereoscopic-displays
#11
Chiuhsiang J Lin, Bereket H Woldegiorgis
In this study, the interaction performances and spatial perceptions in stereoscopic environments were investigated. The experiment compared direct user interactions during pointing at a target, which was continuously visible or presented briefly and disappeared, in both stereoscopic and real environments, at three parallax/depth levels. The position data, collected by a motion system, were used to compute accuracy, signed error, movement time, and throughput. The results showed inaccurate egocentric distance judgment in stereoscopic displays and accurate perceptions in the real world...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610815/corrigendum-to-kansei-engineering-as-a-tool-for-the-design-of-in-vehicle-rubber-keypads-appl-ergon-61c-2017-01-11
#12
Joana Vieira, Joana Maria A Osório, Sandra Mouta, Pedro Delgado, Aníbal Portinha, José Filipe Meireles, Jorge Almeida Santos
No abstract text is available yet for this article.
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610814/analyzing-crowdsourced-ratings-of-speech-based-take-over-requests-for-automated-driving
#13
P Bazilinskyy, J C F de Winter
Take-over requests in automated driving should fit the urgency of the traffic situation. The robustness of various published research findings on the valuations of speech-based warning messages is unclear. This research aimed to establish how people value speech-based take-over requests as a function of speech rate, background noise, spoken phrase, and speaker's gender and emotional tone. By means of crowdsourcing, 2669 participants from 95 countries listened to a random 10 out of 140 take-over requests, and rated each take-over request on urgency, commandingness, pleasantness, and ease of understanding...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610813/motor-adaptation-capacity-as-a-function-of-age-in-carrying-out-a-repetitive-assembly-task-at-imposed-work-paces
#14
Martine Annie Gilles, Jean-Charles Guélin, Kévin Desbrosses, Pascal Wild
The working population is getting older. Workers must adapt to changing conditions to respond to the efforts required by the tasks they have to perform. In this laboratory-based study, we investigated the capacities of motor adaptation as a function of age and work pace. Two phases were identified in the task performed: a collection phase, involving dominant use of the lower limbs; and an assembly phase, involving bi-manual motor skills. Results showed that senior workers were mainly limited during the collection phase, whereas they had less difficulty completing the assembly phase...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610812/dimensions-of-vehicle-sounds-perception
#15
Verena Wagner, K Wolfgang Kallus, Ulrich Foehl
Vehicle sounds play an important role concerning customer satisfaction and can show another differentiating factor of brands. With an online survey of 1762 German and American customers, the requirement characteristics of high-quality vehicle sounds were determined. On the basis of these characteristics, a requirement profile was generated for every analyzed sound. These profiles were investigated in a second study with 78 customers using real vehicles. The assessment results of the vehicle sounds can be represented using the dimensions "timbre", "loudness", and "roughness/sharpness"...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610811/human-factors-in-mental-healthcare-a-work-system-analysis-of-a-community-based-program-for-older-adults-with-depression-and-dementia
#16
Siobhan M Heiden, Richard J Holden, Catherine A Alder, Kunal Bodke, Malaz Boustani
Mental healthcare is a critical but largely unexplored application domain for human factors/ergonomics. This paper reports on a work system evaluation of a home-based dementia and depression care program for older adults, the Aging Brain Care program. The Workflow Elements Model was used to guide data collection and analysis of 59 h of observation, supplemented by key informant input. We identified four actors, 37 artifacts across seven types, ten action categories, and ten outcomes including improved health and safety...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610810/developing-a-contributing-factor-classification-scheme-for-rasmussen-s-accimap-reliability-and-validity-evaluation
#17
N Goode, P M Salmon, N Z Taylor, M G Lenné, C F Finch
One factor potentially limiting the uptake of Rasmussen's (1997) Accimap method by practitioners is the lack of a contributing factor classification scheme to guide accident analyses. This article evaluates the intra- and inter-rater reliability and criterion-referenced validity of a classification scheme developed to support the use of Accimap by led outdoor activity (LOA) practitioners. The classification scheme has two levels: the system level describes the actors, artefacts and activity context in terms of 14 codes; the descriptor level breaks the system level codes down into 107 specific contributing factors...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28610809/an-evaluation-of-touchscreen-versus-keyboard-mouse-interaction-for-large-screen-process-control-displays
#18
Benjamin Noah, Jingwen Li, Ling Rothrock
The objectives of this study were to test the effect of interaction device on performance in a process control task (managing a tank farm). The study compared the following two conditions: a) 4K-resolution 55" screen with a 21" touchscreen versus b) 4K-resolution 55″ screen with keyboard/mouse. The touchscreen acted both as an interaction device for data entry and navigation and as an additional source of information. A within-subject experiment was conducted among 20 college engineering students. A primary task of preventing tanks from overfilling as well as a secondary task of manual logging with situation awareness questions were designed for the study...
October 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28502412/computer-based-estimation-of-the-hip-joint-reaction-force-and-hip-flexion-angle-in-three-different-sitting-configurations
#19
J Van Houcke, A Schouten, G Steenackers, D Vandermeulen, C Pattyn, E A Audenaert
Sitting is part of our daily work and leisure activities and can be performed in different configurations. To date, the impact of different sitting configurations on hip joint loading has not been studied. We therefore evaluated the hip joint reaction force (HJRF) and hip flexion angle in a virtual representative male Caucasian population by means of musculoskeletal modelling of three distinct sitting configurations: a simple chair, a car seat and a kneeling chair configuration. The observed median HJRF in relation to body weight and hip flexion angle, respectively, was 22...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28502411/abdominal-bracing-during-lifting-alters-trunk-muscle-activity-and-body-kinematics
#20
Pieter Coenen, Amity Campbell, Kevin Kemp-Smith, Peter O'Sullivan, Leon Straker
We assessed whether participants are able to perform abdominal bracing during lifting, and described its effects on trunk muscle activity and body kinematics. Fourteen participants performed 10 lifts (symmetrical lifting of a 15 kg load from floor level), 5 with abdominal bracing and 5 without. Activity of the lumbar multifidus (LM) and internal oblique (IO) muscles, and trunk and lower body kinematics were obtained. During non-bracing lifting, IO activity did not increase beyond rested standing levels (with average muscle activity ranging between 8...
September 2017: Applied Ergonomics
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