[Analysis of the sound-insulation effects of control rooms in workshops with noise].

Objective: To study the main factors affecting sound-insulation effects of control rooms in workshops with noise, so as to improve the protection.

Methods: The sound-insulation effects of 467 control rooms were determined, and different building materials, structures of door and window, airtight states etc. were analyzed.

Cardiac arrhythmia in women performing heavy physical work.

The objective of this work was to determine the response of the circulatory system to heavy physical work (the average energy expenditure was about 5000 kJ/shift). The tests were performed on a group of 35 women aged between 24 and 50 years, employed at a printing office as printing machine operators. The average length of employment for the group was 17 years (3-28 years).