| Abstract: | Static work (welding at a ship-yard) was studied by means of quantitative electromyography. Overhead welding by experienced and inexperienced welders was compared to less arduous working situations. EMG from muscles of the shoulder was recorded on tape. The myoelectric spectral developments indicated that localized muscle fatigue was common in prolonged overhead work in the inexperienced group, whereas experienced welders showed signs of fatigue in the supraspinatus muscle only. Melting of several subsequent welding electrodes overhead entailed a progressive increase in muscular reaction, also seen in experienced working men. |
