this study consists of assessments of the thermal environment and physiological
strain in tasks associated with airport, construction, and metal jobs.
The number of male and female participants was 108. Environmental heat
stress was evaluated with the WBGT index. Physiological strain was evaluated
by the relative cardiovascular load (%CVL) based on the measurements of
heart rate. Also the increase of body temperature, weight loss, and perceived
discomfort were determinated. At work sites the assessments lasted for 2 to
4 hrs for each participant. The mean physiological strain exceeded the level
of 30%CVL. Severe peaks (over 60%CVL) were observed in specific tasks
being in agreement with perceived discomfort ratings. The increase of body
temperature and weight loss in most cases remained within acceptable limits.
For the most strenuous tasks, various ergonomic improvements were developed
in consultation with workers and managers