Latent class derived patterns of musculoskeletal disorders in sedentary workers and chair ergonomic design

2021 ◽  
pp. 1-20
Author(s):  
Sara Karimi Zeverdegani ◽  
Maryam Yazdi ◽  
Amir Hossein MollaAghaBabaee
Keyword(s):  
Musculoskeletal Disorders ◽  
Latent Class ◽  
Ergonomic Design

scholarly journals User-centered approach for design and development of industrial workplace

2020 ◽  
Author(s):  
Dario Panariello ◽  
Stanislao Grazioso ◽  
Teodorico Caporaso ◽  
Giuseppe Di Gironimo ◽  
Antonio Lanzotti
Keyword(s):  
Musculoskeletal Disorders ◽  
Objective Measures ◽  
Ergonomic Design ◽  
Design And Development ◽  
User Centered

Abstract In this paper, we propose a user-centered approach for the design of ergonomic workplaces. The method is based on the evaluation of subjective opinions and objective measures from the worker, while performing the industrial tasks. The ergonomic design of industrial workplaces will have impact in reducing the musculoskeletal disorders of workers.

scholarly journals Ergonomics in Dentistry-designing your Work

2014 ◽  
Vol 1 (1) ◽  
pp. 45
Author(s):  
Sowmya Pendyala ◽  
P. Karunakar
Keyword(s):  
Musculoskeletal Disorders ◽  
Medical Profession ◽  
Dental Hygienists ◽  
Ergonomic Design ◽  
Work Related ◽  
The People ◽  
Work Related Musculoskeletal Disorders ◽  
Overall Performance ◽  
Dental Assistants

In recent years, there is a reported increase in the number of people suffering from work related musculoskeletal disorders; though all the people related to medical profession are included, there has been an increase incidence in dentists, dental hygienists, dental assistants. Maintaining one's own health is important for overall performance and understanding the principles of ergonomics helps to achieve this goal. Ergonomics is the science of designing jobs, equipments and workplaces to fit workers. Proper ergonomic design is necessary to prevent work related musculoskeletal disorders and the conditions which might lead to it, thereby increasing the performance of the dentist.

scholarly journals The Ergonomic Design of Bent-Handled Wok for Female Cooks’ Wok Flipping Task

2015 ◽  
Vol 5 (1) ◽  
pp. 58
Author(s):  
Swei-Pi Wu ◽  
Chien-Chung Jen ◽  
Chien-Hsin Yang ◽  
Te-Hong Chien ◽  
Chia-Hui Lin
Keyword(s):  
Upper Extremity ◽  
Musculoskeletal Disorders ◽  
Random Order ◽  
Subjective Rating ◽  
Illusion Effect ◽  
Ergonomic Design ◽  
Independent Variables ◽  
Upper Extremity Musculoskeletal Disorders ◽  
Weight Illusion ◽  
Psychophysical Approach

Conventional straight-handled woks and the ergonomic bent-handled woks under different wok sizes were evaluated using the psychophysical approach. Twelve female subjects were tested using 15 different woks in a random order. The independent variables were the wok handle angle (with two angles of 25˚, 10˚ for traditional wok, and three angles of -5˚, -20˚ and -35˚ for bent-handled wok) and the wok size (with three diameters of 33 cm, 36 cm and 39 cm). The criterion measures included maximum acceptable weight of flipping (MAWF), wrist angle and subjective rating. The results showed both the handle angle and wok size significantly affected the maximum acceptable weight of flipping, wrist angle and subjective rating. The bent-handled wok is superior to the straight-handled wok, and the size-weight illusion effect is significant. In general, a small wok (33 cm diameter) with an ergonomic bent handle (-35˚) is ideal for females to decrease the risk of upper extremity musculoskeletal disorders when performing the flipping task.

Zur Anwendung der CES-D bei älteren Menschen: Dimensionsstruktur und Meßartefakte

Diagnostica ◽  
2000 ◽  
Vol 46 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Herbert Matschinger ◽  
Astrid Schork ◽  
Steffi G. Riedel-Heller ◽  
Matthias C. Angermeyer
Keyword(s):  
Mental State ◽  
Latent Class ◽  
Mini Mental State Examination ◽  
Depression Scale ◽  
Epidemiological Studies ◽  
Partial Credit ◽  
Examination Score ◽  
State Examination

Zusammenfassung. Beim Einsatz der Center for Epidemiological Studies Depression Scale (CES-D) stellt sich das Problem der Dimensionalität des Instruments, dessen Lösung durch die Konfundierung eines Teilkonstruktes (“Wohlbefinden”) mit Besonderheiten der Itemformulierung Schwierigkeiten bereitet, da Antwortartefakte zu erwarten sind. Dimensionsstruktur und Eignung der CES-D zur Erfassung der Depression bei älteren Menschen wurden an einer Stichprobe von 663 über 75-jährigen Teilnehmern der “Leipziger Langzeitstudie in der Altenbevölkerung” untersucht. Da sich die Annahme der Gültigkeit eines partial-credit-Rasch-Modells sowohl für die Gesamtstichprobe als auch für eine Teilpopulation als zu restriktiv erwies, wurde ein 3- bzw. 4-Klassen-latent-class-Modell für geordnete Kategorien berechnet und die 4-Klassen-Lösung als den Daten angemessen interpretiert: Drei Klassen zeigten sich im Sinne des Konstrukts “Depression” geordnet, eine Klasse enthielt jene Respondenten, deren Antwortmuster auf ein Antwortartefakt hinwiesen. In dieser Befragtenklasse wird der Depressionsgrad offensichtlich überschätzt. Zusammenhänge mit Alter und Mini-Mental-State-Examination-Score werden dargestellt. Nach unseren Ergebnissen muß die CES-D in einer Altenbevölkerung mit Vorsicht eingesetzt werden, der Summenscore sollte nicht verwendet werden.

New Evidence on the Construct Validity of the ASI-3 and the Dimensional Conceptualization of Trait Anxiety Sensitivity From IRT Modeling

2017 ◽  
Vol 33 (3) ◽  
pp. 181-189 ◽  
Author(s):  
Christoph J. Kemper ◽  
Michael Hock
Keyword(s):  
Construct Validity ◽  
Anxiety Sensitivity ◽  
Latent Class ◽  
Dimensional Structure ◽  
Sensitivity Index ◽  
Response Scale ◽  
Established Risk Factor ◽  
Irt Models ◽  
Level Data ◽  
Extreme Response

Abstract. Anxiety Sensitivity (AS) denotes the tendency to fear anxiety-related sensations. Trait AS is an established risk factor for anxiety pathology. The Anxiety Sensitivity Index-3 (ASI-3) is a widely used measure of AS and its three most robust dimensions with well-established construct validity. At present, the dimensional conceptualization of AS, and thus, the construct validity of the ASI-3 is challenged. A latent class structure with two distinct and qualitatively different forms, an adaptive form (normative AS) and a maladaptive form (AS taxon, predisposing for anxiety pathology) was postulated. Item Response Theory (IRT) models were applied to item-level data of the ASI-3 in an attempt to replicate previous findings in a large nonclinical sample (N = 2,603) and to examine possible interpretations for the latent discontinuity observed. Two latent classes with a pattern of distinct responses to ASI-3 items were found. However, classes were indicative of participant’s differential use of the response scale (midpoint and extreme response style) rather than differing in AS content (adaptive and maladaptive AS forms). A dimensional structure of AS and the construct validity of the ASI-3 was supported.

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