Temat: cycle work - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Upper Limb Load as a Function of Repetitive Task Parameters: Part 1 - A Model of Upper Limb Load
Autorzy:: Roman-Liu, D.
Powiązania:: https://bibliotekanauki.pl/articles/90123.pdf
Data publikacji:: 2005
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: external load
upper limb
handgrip force
cycle work
repetitive task parameters
praca powtarzalna
obciążenie fizyczne
kończyna górna
siła mięśni
obciążenie pracą
Opis:: The aim of the study was to develop a theoretical indicator of upper limb musculoskeletal load based on repetitive task parameters. As such the dimensionless parameter, Integrated Cycle Load (ICL) was accepted. It expresses upper limb load which occurs during 1 cycle. The indicator is based on a model of a repetitive task, which consists of a model of the upper limb, a model of basic types of upper limb forces and a model of parameters of a repetitive task such as length of the cycle, length of periods of the cycle and external force exerted during each of the periods of the cycle. Calculations of the ICL parameter were performed for 12 different variants of external load characterized by different values of repetitive task parameters. A comparison of ICL, which expresses external load with a physiological indicator of upper limb load, is presented in Part 2 of the paper.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 93-102
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Electromyographic Analysis of a Repetitive Hand Gripping Task
Autorzy:: Cook, T.
Rosecrance, J.
Zimmermann, C.
Gerleman, D.
Ludewig, P.
Powiązania:: https://bibliotekanauki.pl/articles/91061.pdf
Data publikacji:: 1998
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: electromyography
cumulative trauma disorders
work-rest cycle
muscle force
hand gripping
elektromiografia
siła mięśni
cykl pracy
kończyna górna
Opis:: Electromyography (EMG) has been proposed as a method for determining muscle effort in repetitive upper limb tasks, which are often related to cumulative trauma disorders. EMG activity of the finger flexor musculature was investigated during a repetitive hand gripping task having 5 different cycle durations (2 to 6 s), various percentage of work time (and rest) within the work cycle (20% to 80%), and 3 different grip force levels. Thirty healthy adult participants each performed 27 randomly ordered 30-s repetitive hand gripping trials as well as 3 isometric contractions, which were used to normalize data from the hand gripping trials. There was a significant decrease in mean EMG as the duration of the work-rest cycle time increased. At each force level, EMG increased as the percentage of work time within the work-rest cycle increased, but to a greater extent at the highest force level. The results of this study suggest that overall muscle effort, and perhaps muscle fatigue, can be reduced most effectively by modifying the force requirements of the repetitive task. Other variables, such as the percentage of work time within a cycle and overall work cycle time have less effect on the EMG activity level. The results of this study have implications for developing strategies to reduce muscle fatigue during repetitive hand gripping tasks in an effort to reduce the effects of cumulative trauma disorders.
Źródło:: International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 185-198
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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