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Tyler Quinn, Yongsuk Seo, Patrick Yorio, Ali Aljaroudi, Aitor Coca, Jung-Hyun Kim, Raymond J Roberge, W Jon Williams
This study aimed to determine if trunk posture during walking is related to increases in rectal temperature (Tre ). 24 males treadmill walked in one of four conditions (1: thirty minutes at 3.0 mph and 0% grade, 20°C and 50% relative humidity (RH), wearing healthcare worker (HCW) PPE; 2: thirty minutes at 3.0 mph and 0% grade, 27.5°C and 60% RH, HCW PPE; 3: thirty minutes at 3.0 mph and 0% grade, 32.5°C and 70% RH, HCW PPE; and 4: forty minutes at 40% VO2 max, 30°C and 70% RH, wearing firefighter PPE)...
July 17, 2018: Ergonomics
Jordan Navarro, Louis Heuveline, Eugénie Avril, Julien Cegarra
A seminal work by Sheridan and Verplank (1978) depicted ten levels of automation, ranging from no automation to an automation that acts completely autonomously without human support. These levels of automation were later complemented with a four-stage model of human information processing (Parasuraman, Sheridan, and Wickens 2000). Next, human-machine cooperation centred models and associated cooperation modes were introduced (Hoc, Young, and Blosseville 2009). The objective of the experiment was to test which human-machine theories describe automation use better...
July 16, 2018: Ergonomics
Chiara P Ryffel, Celine M Muehlethaler, Sandro M Huber, Achim Elfering
Upset Prevention and Recovery Training (UPRT) is intended to improve the ability of pilots to recognize and avoid situations that can lead to airplane upsets and to improve their ability to recover control of an airplane that has exceeded the normal flight envelope. To this end, a set of different training contents - from theoretical knowledge of aerodynamics and human factors to practice-based flight training - is necessary. In order to support the debriefing with an objective feedback, and because visual scanning is a core competence, two studies on subjective evaluation of aviation pilots - one conducted in a flight simulator and the other one in-flight - focused on the practical application of eye tracking as a debriefing tool in UPRT...
July 16, 2018: Ergonomics
Yu Tian, Yifei Huang, Jibo He, Kunlin Wei
Texting on a cell phone disrupts walkers' gait performance. The performance decrement has been attributed to increased motor demand, decreased visual information and increased cognitive load. However, relative contributions of motor, visual and cognitive factors are poorly understood. Here we quantitatively estimated the relative contributions of these factors by comparing multiple walking conditions. Thirty-two adults walked for 20m, with or without a dual task on the phone. The dual task was either a cognitively-demanding digit ordering task or a casual tapping task...
July 16, 2018: Ergonomics
Suman K Chowdhury, Ashish D Nimbarte, Hongwei Hsiao, Bhaskaran Gopalakrishnan, Majid Jaridi
Work-related shoulder joint disorders contribute considerably to absenteeism in the workplace. To identify the tasks that are stressful to the shoulder joint, a strain index was formulated based on the concept of concavity compression - a shoulder stabilizing mechanism. The magnitude and direction of the shoulder joint reaction forces were used in formulating the strain index. A two phase experiment was conducted. In phase 1, participants performed 30 different manual handling tasks. The tasks were categorized into low, medium, and high strain tasks based on their strain index values...
July 12, 2018: Ergonomics
Wonsup Lee, Xiaopeng Yang, Hayoung Jung, Ilgeun Bok, Chulwoo Kim, Ochae Kwon, Heecheon You
The present study measured 25 dimensions of the ear including the concha and ear canal for ergonomic design of ear products and compared with existing ear measurement studies. Scanning and casting methods were employed to produce 3D ear images for 230 Koreans and 96 Caucasians and measurements of the ear dimensions were obtained by identifying 21 landmarks on individual ear scan image. The Korean ear measurements were found significantly larger (mean difference [Formula: see text] = 0.4 ∼ 3.7 mm) and more varied (ratio of SDs = 1...
July 10, 2018: Ergonomics
Bochen Jia, Maury A Nussbaum
Continuous seated postures may increase the risk of adverse health outcomes such as low-back pain, and this risk may be influenced by several modifying influences. In the present study, we aimed to quantify the effects of continuous sitting and psychosocial stress under an unsupported sitting condition. Fourteen participants completed continuous, 40-min. periods of computer-based tasks, involving both low and higher levels of psychosocial stress, while using a laptop computer without a desk. Continuous sitting significantly increased perceived discomfort (particularly in the upper and lower back), trunk flexion, and metrics of localized muscle fatigue...
July 9, 2018: Ergonomics
Yumeng Yao, Subhash Rakheja, Chantal Gauvin, Pierre Marcotte, Karim Hamouda
The purpose of this study was to evaluate the effects of anti-vibration gloves on manual dexterity and explore factors affecting the manual dexterity. The manual dexterity of ten different gloves was investigated with 15 adult male subjects via performing two different dexterity tests, namely, ASTM F2010 standard test and Two-Hand Turning and Placing Minnesota test. Two-factor repeated-measures analysis of variance was conducted to evaluate the main effects of glove type, test method, and their interaction effect on manual dexterity...
July 8, 2018: Ergonomics
Sajad Zare, Rasoul Hemmatjo, Teimour Allahyari, Mohammad Hajaghazadeh, Abdollah Hajivandi, Mandana Aghabeigi, Reza Kazemi
This study examined the impact of various types of firefighting activities on firefighters' physiological responses and cognitive function. Each firefighter was engaged in three conditions: (1) Live-fire activities (LFA), (2) Typical firefighting activities (TFA), and (3) Rescue operations at height (ROH). The effects of various types of firefighting activities on the physiological responses and cognitive function were evaluated by heart rate (HR), temporal artery temperature (TT), and the correct response (CR) on a cognitive test...
July 3, 2018: Ergonomics
Boyi Hu, Chong Kim, Xiaopeng Ning, Xu Xu
Low back pain (LBP) remains one of the most prevalent musculoskeletal disorders, while algorithms that able to recognise LBP patients from healthy population using balance performance data are rarely seen. In this study, human balance and body sway performance during standing trials were utilised to recognise chronic LBP populations using deep neural networks. To be specific, 44 chronic LBP and healthy individuals performed static standing tasks, while their spine kinematics and centre of pressure were recorded...
July 3, 2018: Ergonomics
Iman Shojaei, Cazmon Suri, Babak Bazrgari
Backpacks with ergonomic features are recommended to mitigate the risk of developing low back pain due to carrying a heavy school backpack. A repeated measure study was conducted on forty college age students to investigate the immediate changes in magnitude and timing aspects of lumbo-pelvic coordination when carrying a modified vs. a normal backpack relative to no backpack condition during trunk forward bending and backward return tasks. We found a smaller reduction in the thoracic range of rotation, an increase vs...
June 28, 2018: Ergonomics
Carolin P Burmeister, Johannes Moskaliuk, Ulrike Cress
Due to ubiquitous computing, knowledge workers do not only work in typical work-associated environments (e.g., the office) but also wherever it best suits their schedule or preferences (e.g., the park). In two experiments using laboratory and field methods, we compared decision making in work and non-work environments. We hypothesised that participants make riskier work-related decisions when in work-associated environments and riskier non-work-related decisions in non-work-associated environments. Therefore, if environment (work vs...
June 28, 2018: Ergonomics
Peter Kearney, Wen-Chin Li, Chung-San Yu, Graham Braithwaite
This research investigated controller' situation awareness by comparing COOPANS's acoustic alerts with newly designed semantic alerts. The results demonstrate that ATCOs' visual scan patterns had significant differences between acoustic and semantic designs. ATCOs established different eye movement patterns on fixations number, fixation duration and saccade velocity. Effective decision support systems require human-centred design with effective stimuli to direct ATCO's attention to critical events. It is necessary to provide ATCOs with specific alerting information to reflect the nature of of the critical situation in order to minimize the side-effects of startle and inattentional deafness...
June 26, 2018: Ergonomics
Radin Zaid Radin Umar, Carolyn M Sommerich, Steve A Lavender, Elizabeth Sanders, Kevin D Evans
Sound workplace ergonomics and safety-related interventions may be resisted by employees, and this may be detrimental to multiple stakeholders. Understanding fundamental aspects of decision-making, behavioural change, and learning cycles may provide insights into pathways influencing employees' acceptance of interventions. This manuscript reviews published literature on thinking processes and other topics relevant to decision making and incorporates the findings into two new conceptual frameworks of the workplace change adoption process...
June 26, 2018: Ergonomics
Cheryl Haslam, Aadil Kazi, Myanna Duncan, Stacy Clemes, Ricardo Twumasi
This article presents longitudinal data from 1120 participants across 10 worksites enrolled in Walking Works Wonders, a tailored intervention designed to increase physical activity and reduce sedentary behaviour. The intervention was evaluated over 2 years, using a quasi-experimental design comprising 3 conditions: tailored information; standard information and control. This study explored the impact of the intervention on objective measures (BMI, %Fat, waist circumference, blood pressure and heart rate) and self-reported measures of physical activity, sedentary behaviour, physical and psychological health...
June 22, 2018: Ergonomics
Aadil Kazi, Cheryl Haslam, Myanna Duncan, Stacy Clemes, Ricardo Twumasi
This article presents baseline data from 1120 employees across 10 worksites enrolled in a workplace physical activity intervention. The study provides new data on physical activity, sedentary behaviour and health and highlights gender, geographical, job type and industrial sector differences. Sitting at work accounted for more than 60% of participants' total daily sitting time on work days. Weekly and monthly hours worked, body mass index (BMI) and waist circumference were significantly higher for workers in the private sector compared to the public sector...
June 21, 2018: Ergonomics
Saman Madinei, Hossein Motabar, Xiaopeng Ning
Sudden loading is a major risk factor for work-related lower back injuries among occupations involving manual material handling (MMH). The current study explored the effects of external weight configuration on trunk biomechanics and trunk rotational stiffness in the sagittal plane during sudden loading. Fifteen asymptomatic volunteers experienced sudden loadings using the same magnitude of weight (9 kg) with two different configurations (medially- or laterally-distributed) at three levels of height (low, middle, and high)...
June 19, 2018: Ergonomics
Jessica A Dobson, Diane L Riddiford-Harland, Alison F Bell, Julie R Steele
No abstract text is available yet for this article.
June 19, 2018: Ergonomics
Yihun Jeong, Suyeon Heo, Giwhyun Lee, Woojin Park
Despite the prevalence of pre-obesity and obesity, the physical capabilities of pre-obese/obese individuals are not well documented. As an effort to address this, this study investigated the pre-obesity and obesity impacts on joint range of motion (RoM) for twenty-two body joint motions. A publicly available passive RoM dataset was analysed. Three BMI groups (normal-weight, pre-obese, and obese [Class I]) were statistically compared in joint RoM. The pre-obese and obese groups were found to have significantly smaller RoM means than the normal-weight for elbow flexion and supination, hip extension and flexion, knee flexion and ankle plantar flexion...
June 19, 2018: Ergonomics
Brendan Ryan, Veli-Pekka Kallberg, Helena Rådbo, Grigore M Havârneanu, Anne Silla, Karoline Lukaschek, Jean-Marie Burkhardt, Jean-Luc Bruyelle, El-Miloudi El-Koursi, Eric Beurskens, Maria Hedqvist
It can be difficult to select from available safety preventative measures, especially where there is limited evidence of effectiveness in different contexts. This paper describes application of a method to identify and evaluate wide-ranging preventative measures for rail suicide and trespass fatalities. Evidence from literature and industry sources was collated and reviewed in a two stage process to achieve consensus among experts on the likely effects of the measures and factors influencing their implementation...
June 8, 2018: Ergonomics
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