Electromyographic and subjective evaluation of a wrist rest for VDT operators

1998 ◽  
Vol 1 (4) ◽  
pp. 239-257
Author(s):  
Erwin Keller ◽  
Helmut Strasser
Keyword(s):  
Experimental Investigation ◽  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Physiological Data ◽  
Physiological Cost ◽  
Working Posture ◽  
Finger Touch ◽  
Muscle Groups ◽  
Vdt Operators ◽  
Objectively Measured

This study assessed the effects of a wrist rest for VDT operators based on an experimental investigation. Muscular strain associated with the working posture was measured continuously via electromyographic activities (EA) of 8 muscle groups which were involved in the working tasks. The electromyographic measurements yielded a clear systematical effect of the wrist rest while entering text using the 10-finger touch system. Values of the EA, as an indicator of physiological cost were essentially lower with the wrist rest. Working without the wrist rest is at least two times more strenuous than working with it. The differences are statistically highly significant. Less positive and less consistent results were found while working on the prefixed mouse pad of the wrist rest. Considering the influence of the working aid on entering text, the results of the subjective assessment after the tests corresponded well with the objectively measured physiological data. Whereas the working aid for entering text was assessed quite positively overall, the integrated mouse pad earned a clearly negative rating.

Assessment of the ergonomic quality of file handles using electromyographic and subjective methods

2004 ◽  
Vol 4 (2) ◽  
pp. 133-142
Author(s):  
Karsten Kluth ◽  
Horst G. Kellermann ◽  
Helmut Strasser
Keyword(s):  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Comparative Investigation ◽  
Measuring System ◽  
Physiological Data ◽  
Objective Data ◽  
Muscle Strain ◽  
Laboratory Device ◽  
Left And Right

In a comparative investigation 3 file handles were evaluated with regard to their ergonomic quality. By means of a mobile measuring system for the recording of peripheral-physiological data, the muscle strain of 9 muscles of the left and right hand-arm-shoulder system was quantified with surface electromyography. A special laboratory device facilitated the standardized execution of the tests. A specific bipolar questionnaire had enabled the subjective assessment of the design, surface material, general usability, avoidance of pressure marks and blisters, suitability for the exertion of the necessary pressure and pushing forces, and the suitability during hand perspiration. Also, the assessment of more or less favorable body positions to various filing directions was made. From substantial differences in the objective data and the subjective evaluation, the inference has to be drawn that only the combination of subjective surveys and objective measurements represent the opportunity to assess the ergonomic quality of working tools adequately.

Threat of premature birth: psycho-social aspects

2016 ◽  
pp. 86-89
Author(s):  
S. Zhuk ◽  
◽  
O. Schurevska ◽  
Keyword(s):  
Pregnant Women ◽  
Physical Functioning ◽  
Premature Birth ◽  
Defense Mechanisms ◽  
Subjective Evaluation ◽  
Clinical Signs ◽  
Subjective Assessment ◽  
Psychological Status ◽  
Stress Load ◽  
Mandatory Participation

The objective: to study the psychological characteristics of women’s status in one of the most common complications of pregnancy - the threat of termination of pregnancy, depending on the level of stress load. Patients and methods. We have studied the psychological status (the Holmes-Rahe level of psychosocial stress, the Spielberg-Hanin level of anxiety, V.I.Dobryakov’s related to a pregnancy test, diagnosis of psychological defense mechanisms, assessment of quality of life) 60 pregnant women with threat of premature birth in the third trimester of pregnancy. Surveyed women were divided into 2 groups: group 1 included 30 pregnant women – forced migrant of Donetsk and Lugansk area and 2 group – 30 pregnant women who resided in Kiev. Results. At the same clinical picture of the threat of premature birth we detected discrepancy between the subjective assessment of their condition in women – forced migrants: a high level of situational and personal anxiety, decrease in physical (physical functioning, role-physical functioning) and psychological (social functioning, role emotional functioning) health, doubtful and pathological subtypes of gestational dominant. This creates prerequisites for complications of pregnancy, childbirth and postpartum future period and requires the participation of psychologists in the work with this category of patients. Conclusion. So, revealed a discrepancy between the objective clinical signs similar obstetric pathology (on the example of threatened abortion) in pregnant women with different levels of stress load and their subjective evaluation of their condition that affects their psychological status. This should be reflected in individually tailored therapy and be mainstreamed into the work of obstetricians and gynecologists with these patients, and requires mandatory participation of psychologists in the work with this category of patients. Key words: pregnancy, the threat of premature birth, stress, psychological status.

scholarly journals Influence of design of dentist’s chairs on body posture for dentists with different working experience

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
F. Huppert ◽  
W. Betz ◽  
C. Maurer-Grubinger ◽  
F. Holzgreve ◽  
L. Fraeulin ◽  
...  
Keyword(s):  
Work Experience ◽  
Dental Treatment ◽  
Subjective Assessment ◽  
Body Posture ◽  
Control Group ◽  
Sitting Position ◽  
Ergonomic Design ◽  
Sitting Posture ◽  
Working Posture ◽  
Working Postures

Abstract Background Musculoskeletal disorders (MSD) are a common health problem among dentists. Dental treatment is mainly performed in a sitting position. The aim of the study was to quantify the effect of different ergonomic chairs on the sitting position. In addition, it was tested if the sitting position of experienced workers is different from a non-dental group. Methods A total of 59 (28 m/31f) subjects, divided into two dentist groups according to their work experience (students and dentists (9 m/11f) < 10 years, dentists (9 m/10f) ≥ 10 years) and a control group (10 m/10f) were measured. A three-dimensional back scanner captured the bare back of all subjects sitting on six dentist’s chairs of different design. Initially, inter-group comparisons per chair, firstly in the habitual and secondly in the working postures, were carried out. Furthermore, inter-chair comparison was conducted for the habitual as well as for the working postures of all subjects and for each group. Finally, a comparison between the habitual sitting posture and the working posture for each respective chair (intra-chair comparison) was conducted (for all subjects and for each group). In addition, a subjective assessment of each chair was made. For the statistical analysis, non-parametric tests were conducted and the level of significance was set at 5%. Results When comparing the three subject groups, all chairs caused a more pronounced spinal kyphosis in experienced dentists. In both conditions (habitual and working postures), a symmetrical sitting position was assumed on each chair. The inter-chair comparisons showed no differences regarding the ergonomic design of the chairs. The significances found in the inter-chair comparisons were all within the measurementerror and could, therefore, be classified as clinically irrelevant. The intra-chair comparison (habitual sitting position vs. working sitting position) illustrated position-related changes in the sagittal, but not in the transverse, plane. These changes were only position-related (forward leaned working posture) and were not influenced by the ergonomic sitting design of the respective chair. There are no differences between the groups in the subjective assessment of each chair. Conclusions Regardless of the group or the dental experience, the ergonomic design of the dentist’s chair had only a marginal influence on the upper body posture in both the habitual and working sitting postures. Consequently, the focus of the dentist’s chair, in order to minimize MSD, should concentrate on adopting a symmetrical sitting posture rather than on its ergonomic design.

scholarly journals An analysis of the objective and subjective evaluation of the results of surgical treatment of morbid obesity

2015 ◽  
Vol 12 (3) ◽  
pp. 26-30
Author(s):  
Valeriy Nikolaevich Egiev ◽  
Yuliya Borisovna Mayorova ◽  
Evgeniy Aleksandrovich Zorin ◽  
Anastasiya Vladimirovna Мелеshko ◽  
Ekaterina Sergeevna Orlovskaya
Keyword(s):  
Bariatric Surgery ◽  
Morbid Obesity ◽  
Body Weight ◽  
Surgical Treatment ◽  
Treatment Effectiveness ◽  
Minimum Weight ◽  
Subjective Evaluation ◽  
Objective Assessment ◽  
Subjective Assessment ◽  
Excess Body Weight

The results of surgical treatment of morbid obesity usually considers a variety of factors and the main attention is paid to the dynamics of body weight after surgery. It is generally accepted that in the absence of reducing excess body weight or with minimum weight loss (a few kilograms), the result is considered unsatisfactory. The aim of the work was to compare an objective assessment of gastric bypass (GBS) and gastric banding (GB) and the subjective evaluation of treatment effectiveness by patients themselves. The study included 457 (69.7%) patients that underwent GB and 198 (30.3%) patients after GBS. At the late postoperative period 243 patients (53.2%) were available after the GB and 112 (56.6%) patients after GBS. The frequency of matches between objective and subjective assessment of outcomes of surgery usually did not exceed 50%. Given this, there is a need for a comprehensive analysis of the results of bariatric surgery. Developed multicomponent scale allows to evaluate the effectiveness of any bariatric surgery.

scholarly journals A Subjective Evaluation of a Nasal Dilator on Sleep & Snoring

1994 ◽  
Vol 73 (6) ◽  
pp. 395-401 ◽  
Author(s):  
Martin B. Scharf ◽  
Michael McDannold
Keyword(s):  
Sleep Quality ◽  
Daytime Sleepiness ◽  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Open Label ◽  
Open Label Study ◽  
Label Study ◽  
History Of ◽  
Stanford Sleepiness Scale ◽  
Sleep Questionnaires

A noninvasive external nasal dilator device was used by 20 subjects with a history of mild snoring in a 2 week open label study. The baseline assessments were obtained during the first week. Treatment effects were evaluated during the second week. Subjects were evaluated using: pre- and post-sleep questionnaires; Stanford Sleepiness Scales completed at breakfast, lunch and dinner; and post-sleep bed partner questionnnaires. All twenty subjects completed the study. A significant number of subjects’ scores improved for sleepiness. Mean scores for the subjective assessment for ease of breathing during sleep improved compared to baseline by 25.6%, snoring loudness improved by 34%, sleep quality improved by 21.8%, and the Stanford Sleepiness Scale revealed a 26% reduction in daytime sleepiness.

Comparison of objective and subjective evaluation of breast symmetrization results in patients with Poland syndrome

2018 ◽  
Vol 90 (1) ◽  
pp. 25-28
Author(s):  
Anna Kasielska-Trojan ◽  
Tomasz Zieliński ◽  
Paweł Pisera ◽  
Bogusław Antoszewski
Keyword(s):  
3D Imaging ◽  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Poland Syndrome ◽  
Breast Asymmetry ◽  
Patients Satisfaction ◽  
Aesthetic Results ◽  
The Difference ◽  
High Level ◽  
Objective And Subjective Evaluation

Introduction: There are many methods of analyzing the appearance of the breasts, but most of them are based on the patient’s subjective assessment or on the opinion of a specialist panel. Anthropometric measurements enable objective breast evaluation. The aim of the study was to compare the objective and subjective evaluation of aesthetic results of breast symmetrization in patients with Poland syndrome. Material and methods: The analysis of the results of the treatment was performed in 7 patients treated surgically due to unilateral breast underdevelopment in Poland syndrome. In the postoperative assessment, the following features were considered: 1 - breast volume, symmetry of: 2 – nipple areola-complexes (NAC), 3 - inframammary folds (IMF), 4 – upper poles (UP). The subjective assessment performed by the patient included each of the listed features and the overall satisfaction with the results of symmetrization on the 10-point Likert scale. Then, objective metric breast analysis was performed. Results: Overall assessment of postoperative breast asymmetry (mean 8.1) indicates a high level of patients’ satisfaction with breasts symmetrization. An objective analysis showed that the average breasts’ difference in volume was about 36 cc and the difference in NAC location was about 1.2 cm. Conclusion: 3D imaging is helpful in planning breast symmetrization procedures, especially in breast prostheses’ selection. Combination of this method with clinical experience results in good postoperative effects.

Relationship between Objective and Subjective Methods in Evaluating Static Discomfort of Car Driver Seat

2012 ◽  
Vol 433-440 ◽  
pp. 4997-5003 ◽  
Author(s):  
D.D.I Daruis ◽  
B.M. Deros ◽  
M.J.M. Nor ◽  
M. Hosseini Fouladi
Keyword(s):  
Pressure Distribution ◽  
Subjective Evaluation ◽  
Multiple Linear Regression Model ◽  
Static Condition ◽  
Subjective Assessment ◽  
Static Characteristic ◽  
Sitting Time ◽  
Body Parts ◽  
Distribution Method ◽  
Lower Back

Objective method alone is insufficient in measuring discomfort of car seats. It is indirect and does not truly convey the perception and feeling of the sitter. A combination of both objective and subjective method gives better evaluation on discomfort. Seat pressure distribution method was adopted to investigate the static characteristic of a seat. The method was found to be statistically repeatable in measuring sitting of fourteen male subjects in static condition. Subjective discomfort through subjective assessment using a valid and reliable self-established questionnaire together with a body pressure map (BPM) showed increasing discomfort as sitting time increase; which is expected. The short term seat pressure distribution was used to be correlated with subjective assessment. Significant and moderate correlation was observed between four local body parts namely the seat pan bolster, thighs, upper back and lower back with overall seat average pressure BPM used in the subjective evaluation. Multiple linear regression model were established; overall discomfort from averaged pressure from BPM can be predicted from right & left buttock, right & left thigh and upper back & lower back. It was found that R-Sq=93.5%, R-Sq (adj) = 83.7% with moderately adequate predictive ability with predicted R-Sq= 46.77%.

Influence of Window Views on the Subjective Evaluation of Discomfort Glare

2010 ◽  
Vol 20 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Geun Young Yun ◽  
Ju Young Shin ◽  
Jeong Tai Kim
Keyword(s):  
Control Systems ◽  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Potential Effect ◽  
Psychological Factor ◽  
Future Design ◽  
Subjective Assessments ◽  
Discomfort Glare ◽  
The Difference

A window is an indispensable element in a building and acts as a view-giving component that keeps occupants in touch with the outside. This study investigated the potential effect of different window views on the subjective assessment of discomfort glare from a simulated window that rendered blank, natural and man-made views from far to close distances. Forty-eight subjects (24 men, 24 women) participated in the experiments. The experimental results confirmed that the subjective evaluation of discomfort glare can vary with the type of window views presented. The results also indicated that there were noticeable variations in the subjective assessments of discomfort glare over the same visual stimuli. A preliminary criterion for classification of subjects’ sensitivity to glare was illustrated and the difference for the ‘‘glare-sensitive’’ and ‘‘glareinsensitive’’ people was statistically significant. This study found that the psychological factor such as window views could be an important factor in the subjective evaluation of discomfort glare. Widely used glare evaluation formulas such as unified glare rating and daylight glare index would not consider psychological factors. Thus, the finding from this study would contribute to a more realistic evaluation of discomfort glare for future design of glare control systems.

scholarly journals Fundamental life motivations and prerequisites for their realization in young men

2018 ◽  
Vol 20 (1) ◽  
pp. 154-159
Author(s):  
I M Ulyukin ◽  
N M Pilnik ◽  
V N Emelyanov ◽  
V N Bolekhan ◽  
E S Orlova ◽  
...  
Keyword(s):  
Subjective Evaluation ◽  
Young Men ◽  
Direct Methods ◽  
Subjective Assessment ◽  
Psychosocial Adaptation ◽  
Existential Crisis ◽  
Professional Health ◽  
Self Transcendence ◽  
The Right

Аbstract. Quality of life of young men in the view of existential compliance is considered. In its most general form, the term «existence» means «specifically human way of being», the main characteristic of which is the freedom of choice, that is the way of being a person, when he is constantly in a situation that asks him: «How does a man will be a person in this situation?». А person’s subjective assessment of his life was investigated by the technique of A. Langle and K. Orgler «Scale of Existence» in 42 practically healthy young men (24,12±1,1 years). Scores diagnosed on such scales as Self-distancing, Self-Transcendence, Freedom, Responsibility, Personality, Existentiality, and Fulfillment testify to the absence of grounds for the development of existential crisis (for a crisis of subjective evaluation of one’s own life). Thus, with the right medical and psychological support of young people, they have the ability to cope with themselves and with the world, and the feasibility of interaction with the internal and external demands and proposals presented to circumstances, correlating with their own values. At the same time, one should keep in mind that a possible conflict can lead to nervous breakdowns, decrease in the level of professional health (a professional fitness). In order to prevent this, it is necessary to identify persons at risk and prevent possible psychosocial adaptation disorders in advance, using direct methods of psychodiagnostic. To this end, both methods of psycho-counseling and solving personal problems through the provision of advice or other assistance are recommended.

scholarly journals Determination of the tactical athlete level of a high-performance tennis team and subjective assessment of the coach

Motricidade ◽  
2018 ◽  
Vol 14 (2-3) ◽  
pp. 32-39
Author(s):  
Layla Maria Campos Aburachid ◽  
Breno Tavares Perdigão Mendes ◽  
Tatiane Mazzardo ◽  
Gabriella Nelli Monteiro ◽  
Nayanne Dias Araújo ◽  
...  
Keyword(s):  
Athletic Performance ◽  
High Performance ◽  
Subjective Evaluation ◽  
Subjective Assessment ◽  
Gender Category ◽  
Tactical Knowledge ◽  
Age Category

The objective of the study was to evaluate the level of tactical knowledge of a high-performance tennis team, considering gender, age, category, and year in the category, years of practice and participation in competitions. There was also a subjective evaluation by two coaches on the level of athletic performance of their athletes, as well as that of the athletes themselves. In the sample, there were 37 athletes, 23 men and 14 women at ages between 11 and 18 years old (14.10 ± 1.90). In order to determine the level of athletic performance of the athletes, the test of declarative tactical knowledge (DTK) in tennis was used. The variables to differentiate the level of tactical performance were gender (female achieved better scores: p=0.004, F = 2.242), the category (better scores for 18 years old compared to 12 years old: p=0.007, F= 4.223) and the experience in state competitions (p = 0.042, F = 3.059). It was observed that 73% of the tennis teams had their level of tactical performance, via DTK, classified as good or very good. In the subjective evaluation, the coach underestimated the tactical level of 48.6% of his athletes, while 75.7% of the athletes overestimated their own knowledge. In this study, it was verified that factors like gender, category and experience in state competitions differentiated the level of tactical performance.  

Sign in / Sign up

Export Citation Format

Share Document