The influence of noise and vibration upon creatine kinase activity in blood serum.

The investigations comprised part of the workers employed in a factory of prefabricated concrete elements. The creatine kinase (CK) activity was determined before and after a day's work in the following groups of workers: I-exposed to noise and vibration exceeding the allowed norm, II- exposed to noise, performing the same hard physical work as group I and exposed to vibration not exceeding 79dB in particular octave bands, III- practising physical work a group I and II but in environment free from noise and vibration, and a control group of persons (C) not exposed to any of the tested factors (vibration, noise, work). The obtained results indicate that the determination of the CK activity may serve as a test of exposure to vibration and noise.