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This study was carried out in order to determine the effect of physical disability (paraplegia) and sensory disability (deafness) on motor skills of the upper limbs. Studies were distinguished by two parameters: the nature of the control curve (sine or random) and the magnitude of the isometric force exerted on the lever (10 N, 20 N, 40 N, 80 N). A comparison of the quality of manual force control...
The aim of this study was to assess handgrip and 5 other types of force in 52 women and to determine if handgrip force reflected general upper limb force capabilities correlated with age. The women were divided into subgroups according to age: 20–25, 45–50 and 55–65 years. Maximum forces of the right upper limb were measured in 6 types of force activities. In most tests the values of force showed...
The aim of this study was to analyse postural load during tasks related to milking cows of 2 farmers on 2 different farms (one with a manual milk transport system, the other with a fully automated milk transport system) as a case study. The participants were full-time farmers, they were both healthy and experienced in their job. The Ovako Working Posture Analyzing System (OWAS) was used to evaluate...
The aim of this study was to analyse the electromyographic (EMG) power spectrum indicating differences in the frequency bands of the spectrum resulting from differences in muscle type and force level for the extensor digitorum (ED), palmaris longus (PL) and biceps brachii (BB) muscles. The study was performed on 12 young men as 2 tests different in terms of the type of exerted force (30, 15 and 5%...
The aim of the study was to compare the theoretical indicator of upper limb load with the physiological indicator of musculoskeletal load, which is present while performing a repetitive task (a normalized electromyography [EMG] amplitude recorded from the muscles of the upper limb involved in the performed task). In an experimental study of a repetitive task, the EMG signal from 5 main muscles of...
The purpose of the study was to analyse the influence of the precision of a task on tension and fatigue of the trapezius and deltoid muscles. Ten young men took part in experiments. Different levels of force and different frequencies of pressing a button defined the precision of the task. Surface electromyography (EMG) was used. Muscle tension and fatigue were reflected by 2 parameters of the EMG...
Designing objective and subjective methods of studying the abilities of disabled people is one of the most important things to be done before employing them. That is why new assessment methods are proposed. Evaluation as a testing procedure used for defining the abilities of disabled people - general capacity, range, and strength of the main groups of muscles and extremities, psychological tests,...
The goal of the study was to check, with regard to ergonomics, workstations equipped with visual display terminals in selected enterprises. Over 180 workstations were tested in 3 enterprises. Most workstations were equipped with computers. The ergonomics of both the parameters of the basic components of the workstation (i.e., a chair and a desk, and the position of the computer at the workstation...
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