Electromyographic activity (EMG) from m. flexor carpi radialis (FCR) and m. extensor carpi radialis longus (ECRL) of the right forearm was recorded together with wrist angles in the flexion/extension and radial/ulnar plane in 20 healthy automobile assembly line workers during work. Eleven of these were randomly recruited from assembly stations with a low prevalence of subjective wrist/forearm symptoms (LPS), while the rest came from stations with a high prevalence of symptoms (HPS). The main EMG finding was a clear difference in activation pattern between flexors and extensors. ECRL was activated more statically, while FCR had a more dynamic pattern with more pauses but also higher peak loads. The main wrist angle finding was a difference in angle distribution as well as absolute angular velocity in the radial/ulnar plane between LPS and HPS work stations. Workers in HPS stations worked longer times in a more ulnar deviated hand position and had higher absolute deviation angular velocity compared to LPS workers, indicating ulnar deviation as a risk factor. Generally, ulnar deviation from a neutral position was more frequent than angular displacement in the flexion/extension plane.
Forearm muscular load and wrist angle among automobile assembly line workers in relation to symptoms
Applied Ergonomics ; 28 , 1 ; 41-47
1997
7 Seiten, 7 Bilder, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
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