Favorable movements of the hand-arm system in the horizontal plane assessed by electromyographic investigations and subjective rating

摘要: Abstract A study was carried out in order to analyze the influence of different movement directions on muscular strain hand–arm system when handling light weights. 11 female subjects had perform a one-handed lifting task horizontal plane, moving repetitively objects approximately 0 kg and 1 kg table. Thirteen frontal area been provided. Electromyographic activity (EA) continuously recorded from 8 muscles left hand–arm–shoulder upper trunk. All data were standardized by arising under maximum voluntary contractions (MVC). The EA-values separated into static dynamic components. Before test, assess their preference each direction. After working direction actually felt rated scale. Both components show strong dependence around 30° (measured body plane) cause less than half load comparison with between 90° 160°, which are often found real work situations. When weight up 30% EA found. According these findings relevant muscle groups dependent is not neglectable. nearly weightless object also essential. pure arm seems be already responsible for relatively high during this kind work. subjective ratings before tests differed considerably physiological findings. after however, corresponded measured some important represent bottlenecks repetitive manual movements. Relevance industry weights industrial workplaces, as example supermarket checkouts assembly-lines. layout workplaces normally refers anthropometric dynamics Especially movements an parameter strain. Almost considerable part can reduced if reconstructed according study.