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Wyświetlanie 1-5 z 5
Tytuł:
Effects of Ergorest Arm Supports on Muscle Strain and Wrist Positions During the Use of the Mouse and Keyboard in Work With Visual Display Units: A Work Site Intervention
Autorzy:
Lintula, M.
Nevala-Puranen, N.
Louhevaara, V.
Powiązania:
https://bibliotekanauki.pl/articles/90210.pdf
Data publikacji:
2001
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
ergonomics
arm support
electromyography
wrist angle
ergonomia
elektromiografia
nadgarstek
Opis:
The effects of Ergorest arm supports on wrist angles and musculoskeletal strain in the neck-shoulder-arm region and electrical activity in the shoulder and arm muscles were studied during typing or the use of the mouse in work with a visual display unit (VDU). Twenty-one women were randomized into 3 groups (1 arm support, 2 arm supports, and control). Measurements were carried out before and after the 6-week intervention. The wrist extension of the mouse hand, the muscle activity of the trapezius muscle, and the subjective discomfort ratings indicated that 2 arm supports were better than 1 in work with a mouse. The Ergorest arm support alleviates muscle and joint strain in VDU work when used for both arms.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2001, 7, 1; 103-116
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexion and Extension Angles of Resting Fingers and Wrist
Autorzy:
Lee, K.-S.
Jung, M.- C.
Powiązania:
https://bibliotekanauki.pl/articles/90396.pdf
Data publikacji:
2014
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
finger
wrist
resting posture
angle
palce
nadgarstek
kąt zgięcia
pozycja odpoczynku
Opis:
This study determined flexion and extension angles of resting fingers and wrist in terms of forearm posture (neutral, pronation and supination) and shoulder flexion (0°, 45°, 90° and 135°). The participants participated in 12 angle measurements for 16 finger joints and wrist. The finger joints flexed more in supination than in neutral posture and pronation and the thumb flexed more than the other fingers because of the gravity and skin tension. This phenomenon became more apparent as the shoulder flexed. The carpometacarpal joint had the largest flexion angle in the thumb joints, whereas the proximal interphalangeal joints had the largest flexion angles in the other finger joints. The resting posture of the wrist extended of ~16° in any forearm postures when the shoulder was at 0°. The results of this study could be useful for rehabilitation tool and product designs.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2014, 20, 1; 91-101
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Grip Force Using Electromyograms in Isometric Isotonic Conditions
Autorzy:
Claudon, L.
Powiązania:
https://bibliotekanauki.pl/articles/91101.pdf
Data publikacji:
1998
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
cumulative trauma disorders
biomechanical stresses
upper limb
kończyna górna
biomechanika
nadgarstek
Opis:
The purpose of this study was to develop a relationship to evaluate the grip force (forcerel) using the electromyogram (EMGrel) of the flexor digitorum superficialis (FDS) and of the extensor digitorum (ED) according to the flexion-extension wrist angle (0t-e) and to the pronation-supination forearm angle (0p-s). Fifteen participants had to exert 3 levels of grip forces in 4 positions of the wrist combined with 3 positions of the forearm. The relationship is: forcerel = 0.0045 • 0t-e • EMGrel(FDS) + 0.48 • EMGrel(FDS)-0.0014 • 0t-e • EMGrel(ED) -0 .0016 • 0p-s • EMGrel(ED) • 0.4- EMGrel(ED) This relationship can be used to estimate grip force for levels of strength lower than 50% of the maximal voluntary contraction.
Źródło:
International Journal of Occupational Safety and Ergonomics; 1998, 4, 2; 169-184
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relevance of the EMG/Grip Relationship in Isometric Anisotonic Conditions
Autorzy:
Claudon, L.
Powiązania:
https://bibliotekanauki.pl/articles/91069.pdf
Data publikacji:
2003
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
cumulative trauma disorders
upper limb
electromyogram (EMG)
force
isometric contraction
anisotonic contraction
schorzenia kończyn górnych
uraz kończyny górnej
kończyna górna
nadgarstek
ręka
Opis:
The aim of the present study was to develop a relationship to evaluate grip force using the electromyogram (EMG) in isometric anisotonic conditions. The EMGs of the flexor digitorum superficialis (FDS) and the extensor digitorum (ED) were recorded in 3 flexion-extension positions of the wrist (30° flexion, 30° extension, and 60° extension) associated with 3 positions of the forearm (70° pronation, prono-supination, and 70° supination). For each position, the participants had to follow linear ramp targets (2 rates of increase and decrease) displayed on an oscilloscope. The results show the best fit is a quadratic type force-EMG relationship. Some aspects such as the rate of force variation and the forearm and wrist positions are then discussed along with the limitations of the relationship.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2003, 9, 2; 121-134
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Professionals and Carpal Tunnel Syndrome (CTS)
Autorzy:
Ali, K. M.
Sathiyasekaran, B. W. C.
Powiązania:
https://bibliotekanauki.pl/articles/90158.pdf
Data publikacji:
2006
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
musculoskeletal disorders
cross-sectional study
occupational disorder
Tinel’s sign
Phalen’s sign
wrist
hand
body mass index
nadgarstek
ręka
praca a choroby
komputer
choroby narządów ruchu
pozycja przy pracy
choroba zawodowa
syndrom cieśni nadgarstka
Opis:
Carpal Tunnel Syndrome (CTS) is an important problem among computer professionals. Hence the prevalence of CTS among computer professionals and risk factors were studied. 648 subjects were selected from 4,276 computer professionals from 21 companies with a simple random sampling method. CTS was diagnosed based on clinical features.The prevalence of CTS was found to be 13.1% (95% CI 10.5–15.7%). Subjects with over 8 years of computer work, over 12 hrs of work per day and system administrators were at a higher risk for CTS (OR 3.3, 4.9 and 2.5 respectively). Flexed or extended hand position had higher risk for CTS. Higher risk for CTS was found with higher exposure to computer work. Ergonomic considerations are important in facilitating proper positioning of hand while working with a computer. Further studies on CTS risk factors among computer professionals are essential for planning prevention.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2006, 12, 3; 319-325
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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