Wyniki wyszukiwania - BazTech

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Development and testing of a wearable passive lower-limb support exoskeleton to support industrial workers

Yan Zefeng, Han Bin, Du Zihao, Huang Tiantian, Bai Ou, Peng Ansi

Biocybernetics and Biomedical Engineering

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2021

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Vol. 41, no. 1

221--238

EN

A custom-designed, wearable, lightweight, and passive exoskeleton was proposed to provide gravity support for industrial workers to reduce prevalence of musculoskeletal disorders, joint injures, and arthritis caused by repeatedly or persistently squatting task. The designed exoskeleton can act as a wearable chair to allow workers to squat for an extended period when performing prolonged tasks. The exoskeleton employs torsion springs to store energy harvested from the squatting motion, and the stored energy is released to help the workers stand up. Dimensions optimization designs based on the finite element analysis program were implemented for a lightweight of the device. Besides, the exoskeleton effectiveness was investigated by performing an ergonomic assessmenton muscular activity, plantar pressure, endurance time, and comfort. The plantar pressure and electromyography of rectus femoris, biceps femoris, vastus medialis, and vastus laterals were measured in a simulated assembly task with the knee bend for three different angles (60°, 90°, 120°) under two conditions of with and without the exoskeleton. The endurance time was recorded in three different static squatting tasks. The comfort with the exoskeleton was recorded. Under the condition of wearing the exoskeleton, the average reduction of muscle activity was 44.8–71.5%, and the plantar pressure was 58.5–64.2%. The exoskeleton contributed to an increase in endurance time from 2.76 to 13.58 min. Moreover, 70% of the subjects exhibited a comprehensive exoskeleton comfort score of higher than 70. The experimental results demonstrated that this exoskeleton has good potential to reduce physical workload and increase endurance time during industrial assembly tasks.

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Ocena aktywności wybranej grupy mięśni na podstawie pomiaru zmian temperatury powierzchni ciała

Anwajler J., Dudek K.

Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna

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2009

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Vol. 15, nr 1

20-22

PL

W pracy analizowano możliwość oceny aktywności mięśni na podstawie pomiaru zmian temperatury bezpośrednio nad powierzchnią pracujących mięśni. Przedstawiono wyniki pomiaru zmian temperatury na powierzchni skóry nad grupą mięśni zginających przedramię po ćwiczeniach czynnych z oporem, wykonywanych asymetrycznie. Określono optymalne warunki rejestracji termograficznej zmian temperatury skóry nad mięśniem dwugłowym ramienia oraz zależność tych zmian od intensywności ćwiczeń.

EN

The aim of this work was to analyse the possibility of evaluating muscular activity on the basis of temperature changes measured directly over the surface of working muscles. Temperature changes on the skin surface over the group of muscles responsible for flexing the forearm after active exercises with resistance carried out asymmetrically, were measured. The following parameters were determined: optimal conditions for thermal recording of the temperature changes of the skin's surface over the biceps muscle of forearm and the influence of the exercises intensity on temperature distribution.

3

A Comparison of Muscular Activity Involved in the Use of Two Different Types of Computer Mouse

Kumar R., Kumar S.

International Journal of Occupational Safety and Ergonomics

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2008

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Vol. 14, No. 3

305--311

EN

Two types of computer input devices, a conventional mouse and a roller bar one, were studied in terms of muscular activitiy in m. trapezius dexter, m. deltoideus anterior dexter and m. extensor digitorum dexter, and comfort rating. Fifteen university students and employees participated in this study. The order of the devices was random. While a task was performed, electromyography (EMG) data were recorded for each test. Muscular activity was found to be significantly lower for the roller bar mouse than for the conventional one. Comfort rating indicated there was a significant difference in moving a cursor with the conventional mouse compared to the roller bar one. It is concluded that a roller bar mouse allowed the subjects to work closer to the body compared to the conventional one, thus the former can be recommended as a general means of reducing upper extremity musculoskeletal disorders.