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Applied Ergonomics

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https://www.readbyqxmd.com/read/28528627/physical-risk-factors-identification-based-on-body-sensor-network-combined-to-videotaping
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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/28318502/efficacy-of-virtual-reality-in-pedestrian-safety-research
#9
Shuchisnigdha Deb, Daniel W Carruth, Richard Sween, Lesley Strawderman, Teena M Garrison
Advances in virtual reality technology present new opportunities for human factors research in areas that are dangerous, difficult, or expensive to study in the real world. The authors developed a new pedestrian simulator using the HTC Vive head mounted display and Unity software. Pedestrian head position and orientation were tracked as participants attempted to safely cross a virtual signalized intersection (5.5 m). In 10% of 60 trials, a vehicle violated the traffic signal and in 10.84% of these trials, a collision between the vehicle and the pedestrian was observed...
March 16, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28318503/sociotechnical-systems-as-a-framework-for-regulatory-system-design-and-evaluation-using-work-domain-analysis-to-examine-a-new-regulatory-system
#10
Tony Carden, Natassia Goode, Gemma J M Read, Paul M Salmon
Like most work systems, the domain of adventure activities has seen a series of serious incidents and subsequent calls to improve regulation. Safety regulation systems aim to promote safety and reduce accidents. However, there is scant evidence they have led to improved safety outcomes. In fact there is some evidence that the poor integration of regulatory system components has led to adverse safety outcomes in some contexts. Despite this, there is an absence of methods for evaluating regulatory and compliance systems...
March 15, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28284701/visualizing-stressful-aspects-of-repetitive-motion-tasks-and-opportunities-for-ergonomic-improvements-using-computer-vision
#11
Runyu L Greene, David P Azari, Yu Hen Hu, Robert G Radwin
Patterns of physical stress exposure are often difficult to measure, and the metrics of variation and techniques for identifying them is underdeveloped in the practice of occupational ergonomics. Computer vision has previously been used for evaluating repetitive motion tasks for hand activity level (HAL) utilizing conventional 2D videos. The approach was made practical by relaxing the need for high precision, and by adopting a semi-automatic approach for measuring spatiotemporal characteristics of the repetitive task...
March 9, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28283174/real-time-rula-assessment-using-kinect-v2-sensor
#12
Vito Modesto Manghisi, Antonio Emmanuele Uva, Michele Fiorentino, Vitoantonio Bevilacqua, Gianpaolo Francesco Trotta, Giuseppe Monno
The evaluation of the exposure to risk factors in workplaces and their subsequent redesign represent one of the practices to lessen the frequency of work-related musculoskeletal disorders. In this paper we present K2RULA, a semi-automatic RULA evaluation software based on the Microsoft Kinect v2 depth camera, aimed at detecting awkward postures in real time, but also in off-line analysis. We validated our tool with two experiments. In the first one, we compared the K2RULA grand-scores with those obtained with a reference optical motion capture system and we found a statistical perfect match according to the Landis and Koch scale (proportion agreement index = 0...
March 7, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28274467/an-iphone-application-for-upper-arm-posture-and-movement-measurements
#13
Liyun Yang, Wilhelmus J A Grooten, Mikael Forsman
There is a need for objective methods for upper arm elevation measurements for accurate and convenient risk assessments. The aims of this study were (i) to compare a newly developed iOS application (iOS) for measuring upper arm elevation and angular velocity with a reference optical tracking system (OTS), and (ii) to compare the accuracy of the iOS incorporating a gyroscope and an accelerometer with using only an accelerometer, which is standard for inclinometry. The iOS-OTS limits of agreement for static postures (9 subjects) were -4...
March 6, 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28259238/a-data-driven-approach-to-modeling-physical-fatigue-in-the-workplace-using-wearable-sensors
#14
Zahra Sedighi Maman, Mohammad Ali Alamdar Yazdi, Lora A Cavuoto, Fadel M Megahed
Wearable sensors are currently being used to manage fatigue in professional athletics, transportation and mining industries. In manufacturing, physical fatigue is a challenging ergonomic/safety "issue" since it lowers productivity and increases the incidence of accidents. Therefore, physical fatigue must be managed. There are two main goals for this study. First, we examine the use of wearable sensors to detect physical fatigue occurrence in simulated manufacturing tasks. The second goal is to estimate the physical fatigue level over time...
March 1, 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
#15
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
#16
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
https://www.readbyqxmd.com/read/28502410/performance-awareness-predicting-cognitive-performance-during-simulated-shiftwork-using-chronobiological-measures
#17
Drew M Morris, June J Pilcher, Joseph B Mulvihill, Melissa A Vander Wood
Physiological tracers of circadian rhythms and a performance awareness index were examined as predictors of cognitive performance during two sleep deprivation conditions common to occupational shiftwork. Study 1: Thirty-three sleep-deprived participants completed a simulated nightshift. Study 2: Thirty-two partially sleep-deprived participants completed a simulated dayshift. A standardized logic test was used to measure cognitive performance. Body temperature and heart rate were measured as chronobiological indices of endogenous circadian rhythms...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28502409/field-evaluation-of-a-wearable-multimodal-soldier-navigation-system
#18
Iina Aaltonen, Jari Laarni
Challenging environments pose difficulties for terrain navigation, and therefore wearable and multimodal navigation systems have been proposed to overcome these difficulties. Few such navigation systems, however, have been evaluated in field conditions. We evaluated how a multimodal system can aid in navigating in a forest in the context of a military exercise. The system included a head-mounted display, headphones, and a tactile vibrating vest. Visual, auditory, and tactile modalities were tested and evaluated using unimodal, bimodal, and trimodal conditions...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28502408/combined-effect-of-low-back-muscle-fatigue-and-passive-tissue-elongation-on-the-flexion-relaxation-response
#19
Sangeun Jin, Gary A Mirka
Previous literature has documented the alterations in the flexion-relaxation response of the lumbar extensor musculature to passive tissue elongation (PTE) and muscle fatigue (MF). There is no study, however, that has explored this response as a function of the combined effect of both PTE and MF, which is often seen in occupational settings. Twelve participants performed three experimental protocols on three different days to achieve (1) PTE, (2) MF and (3) PTE&MF (combined). Trunk kinematics and muscle activities were monitored to assess the effects of these protocols on the peak lumbar flexion angle and the lumbar angle of the flexion-relaxation of the trunk extensor muscles...
September 2017: Applied Ergonomics
https://www.readbyqxmd.com/read/28502407/i-spy-with-my-little-eye-analysis-of-airline-pilots-gaze-patterns-in-a-manual-instrument-flight-scenario
#20
Andreas Haslbeck, Bo Zhang
The aim of this study was to analyze pilots' visual scanning in a manual approach and landing scenario. Manual flying skills suffer from increasing use of automation. In addition, predominantly long-haul pilots with only a few opportunities to practice these skills experience this decline. Airline pilots representing different levels of practice (short-haul vs. long-haul) had to perform a manual raw data precision approach while their visual scanning was recorded by an eye-tracking device. The analysis of gaze patterns, which are based on predominant saccades, revealed one main group of saccades among long-haul pilots...
September 2017: Applied Ergonomics
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