Hemodynamic reactions to monotonous work performed in silence and in noise of 70 dB (A).

Hemodynamic parameters (cardiac contraction rate, ejection volume, arterial blood pressure and total vascular peripheral resistance) were evaluated in women during 4-hours' monotonous work, connected with a moderate exercise, or monotonous visual work performed in laboratory conditions. Next, the capacity of noise of 70 dB(A) to modify changes of hemodynamic parameters caused by work was checked. It was found that the noise did not affect work efficiency, but it did result in an increase of ejection volume and a rise in arterial (especially diastolic) blood pressure. Noise of 70 dB(A) brings about an increase of physiological effort of work.