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Biomedical subjects

W Rohmert

Publications and source records attributed to W Rohmert.

At least 37 records · Page 2Linked to original sources
PubMed1982

Ergonomics investigations of work-places in a police command-control centre equipped with TV displays.

Ergonomics experiments were performed in a police command-control centre using computer controlled text processing systems with three alternative input devices: function keys, a light pen and a touch panel. A group of 14 operators was examined while using the alternative devices. Significant differences were found between the devices in terms of the following: sensory and motor activities, local muscular strain, transgressions of tolerance limits for 4-hour work sessions, and increases in heart rate. Suggestions for redesigning the control centre are given using anthropometric analysis. The paper also shows the relation between the sub-optimal design of a work system and the resulting strain.

Journal Article↗
PubMed1980

[Investigation of demands in data and text processing by an ergonomic job description questionnaire (DT-EIJDQ) (author's transl)].

A questionnaire for Ergonomic Job Description is developed for the area of text and data processing. The contents and structure of the method are described and its applicability is demonstrated in a field study. To interprete the data, methods of cluster, profile, and factor analyses are used. The jobs for which the data have been collected are classified according to their specific demands by the use of factor analysis. Further applications of the method are outlined.

Ergonomics↗
PubMed1980

Occupational health studies on airport transport workers. II. Muscle strength of airport transport workers.

Airport transport workers do manual work in loading and unloading the cargo space of passenger airplanes. In several types of airplanes the work has to be carried out in narrow spaces and in cramped positions. The present study describes the isometric strength of some muscle groups in 70 airport transport workers. Trunk extensors, trunk flexors, muscles involved in bimanual vertical lifting, elbow extensors, and elbow flexors were measured. A method with fixed positions and strictly isometric contractions was used. The strengths of the different muscle groups correlated with each other and with body weight; those of lifting, trunk flexors and biceps also with stature. The absolute strength of the muscle groups declined with advancing age at rates from 0.3% to 1.5% per year, the relative strength (N/kg body weight) by 0.9%-2.0% per year.

Adult↗
PubMed1980

[Bioelectrode jellies for long-term monitoring (author's transl)].

The properties of 18 electrode jellies were investigated: electrical conductivity, ionic content, pH, skin irritation, and skin impedance reduction with different skin preparations, motion artifact, electrochemical noise with different electrode material, susceptibility to drying, ease of handling, and cost. There were significant differences of performance. Skin compatibility after 8 h ranged from "no irritation" to "severely irritating". A skin irritation most likely occurred with decornifying skin preparation. The specific skin impedance 24 min after the application ranged from 15 k omega . cm2 to 125 k omega . cm2. The motion artifacts differed up to 250%. All jellies produced negligible noise with Ag/AgCl and stainless steel electrodes. However, with gold and silver electrodes the noise amounted to 19 and 23 mu V. The NaCl content was correlated to the skin irritation and the impedance reduction. The impedance reduction correlated inversely to the skin compatibility and the motion artifact. Guidelines for the selection of an appropriate jelly in ergonomic long-term monitoring are given.

Cost-Benefit Analysis↗
PubMed1980

[Methods for the unlimited measurement of the kinetics of power operated handles discussed by means of bicycle ergometer pedals (author's transl)].

For the unlimited measurement of the kinetics of symmetrical power operated handles a measuring device was installed on a bicycle ergometer. The two-dimensional deflection of the pedal cranks is measured and amplified by strain gauges, slip rings and operation-amplifiers. An analog voltage proportional to the position of the cranks is made by an angular potentiometer installed in the bottom chain. An exemplary course of the forces is given in function of the pedal angular.

Electronics, Medical↗
PubMed1980

[Job analysis applied to the disabled (author's transl)].

Job analysis data are helpful in solving a wide range of rehabilitation and ergonomic problems. The ergonomic job analysis procedure for the disabled is based on a universal procedure, called AET (Arbeitswissenschaftliches Erhebungsverfahren zur Tätigkeitsanalyse). To this basic procedure a supplement for the analysis of jobs for the disabled has been developed. The idea of supplementing a basic job analysis procedure for special purposes enables us not only to compare (cluster analysis) basic data of a wide range of jobs but also to analyse groups of jobs in more detail. This paper describes structure and contents of the supplement for the disabled. Examples for application are given.

Disability Evaluation↗
PubMed1979

[Evaluation of human strain during interrupted exposure to vibration (author's transl)].

The psychophysical reactions to stochastic vibrations transmitted in vertical direction to sitting man are investigated in simulated experiments under laboratory conditions. In the framework of an appropriate concept of assessment, indicators related to bottleneck situations in functional systems of the organism for activity and strain measurements allow the evaluation of the recreation efficiency of interruptions in exposure time. The special meaning of the distribution and thus the frequency rate of the interruptions can be illustrated particularly by the variance in time of the strain processes of selected muscles. Between the degree of muscle fatigue and the period of uninterrupted exposure time (expressed in "exposition-interruption-distribution") a significant correlation results so that numerous interruptions of vibration exposure should be considered as a profitable guideline for work design with respect to ergonomics.

Adult↗
PubMed1979

Systematic selection of shift plans for continuous production with the aid of work-physiological criteria.

Taking into account the numerous theoretically possible shift systems, we chose sensible shift systems with the aid of objective work-physiological criteria, eg, the duration of the daily working time, the positioning and duration of sleep and recreation time. With an agreed 40 h week shift, systems with a weekly working time of 42 h are more advantageous. If the shifts are equally attended over 24 h the following shift systems are recommended: when you have 8 h shifts the relation between the number of working days and the number of free days should be "3 n/n", whereby n must be larger than 1, within one shift rota. In the exceptional case of a 12 h shift the corresponding relation should be "2 n/n". Further unsuitable and recommended shift plan examples are demonstrated for these shift systems.

Journal Article↗
PubMed1978

[Performance- and strain-compensation with informatory work].

With results from literature it is shown that eye-blinking-rate is negative significant correlated with physiologic performance ability. Experiments with an abstract tracking task presented in this paper confirm that eye-blinking-rate is an indicator for activation. Taking in the indicator for activation (blinking-rate), tracking performance and central-physiological strain, phases of performance- and strain-compensation (stability, effort, fatigue, performance break-down) are defined in an hierarchical concept of stability. The compensatory processes of the human operator are discussed on the background of a stress-strain-concept taking account of the principle of feed-back.

Eyelids↗