Use of EMG in a kinesiological study in industry.
Appl Ergon 1984 Dec; 15(4):297-301
The magnitude of fatigue after certain physical tasks was studied in factory workers. Two male factory workers who were healthy and middle aged participated in the study. The workers operated an embossing machine. The physical tasks consisted of subjecting the workers to various degrees of fatigue in the lower back muscles by leaning forward at the waist while performing their work. Muscular fatigue was measured by electromyography. The tasks involved reaching a distance of either 32 or 36 inches. The integrated electromyographic amplitude was determined for the lean recording by inputting the signals into an alternating voltmeter. Percent of signal power in the 4 to 30 Hertz frequency band was determined for each static recording by computer analysis. The recordings were made over the course of each work day. The final static recording of subject 1 increased 100 percent over the initial value whereas that of subject 2 rose 47 percent. The final electromyographic amplitude increased 263 and 83 percent for subjects 1 and 2, respectively. Percent of signal power in the 4 to 30 Hertz band for each day of the static electromyographic recordings did not change significantly. The author concludes that it is necessary to reduce maximum tasks required in the operation of embossing machines. Such measures will ensure worker safety and health.
NIOSH-Author; Ergonomics; Analytical-methods; Factory-workers; Physical-capacity; Industrial-environment; Electronic-equipment; Occupational-hazards; Work-capacity; Physiological-response