Study on air traffic controller’s workload

31 male and female air-traffic controllers (ATCs) were investigated during their work shift (24 hours continuously). The index of heart rate mathematical analysis, blood pressure, simple reaction time and CFF test during working shift were measured. Some questionnaires were given to subjects as well. The obtained results (systolic blood pressure, CFF,  and strain index, simple reaction time) showed changes in comparison with that before work. The rate of some subjective symptoms such as eye irritation, headache, dry and sore throat, whole body fatigue, pain in shoulders and low back, etc were rather high. Specific work conditions and working duration were the main reasons of work strain in ATCs.

Occupational burden of circus

Circus is a specific work demanding high physical effort and emotional strain. Using monitoring ECG, the survey was conducted on 12 young male and female circus actors, aged 14-21 years during their training performance. The aim of the survey was to evaluate circus workload on cardio-vascular system. The obtained results showed that circus could be considered as extreme heavy work according to the Christensen's classification. Their average heart rate (RH) during the performance was 163 beats/min (heart rate at rest was 76.6 beats/mn). The momentary maximal HR was 255 beats/min for swinging performance on altitude and 198 beats/min for jumping and marking loops in the net. Their minute HR variations were 35-130 beats/min and 10-58 beats/min accordingly. The benefit of the monitoring ECG in studying some specific occupations was confirmed.

Occupational stress and mental health of operator

Results of the study on 84 operators showed that automatic working conditions affected on operator's health considerably: 31% of workers suffering from emotional disorder were founded out by questionnaires and psychological tests. Among them, there were 5 cases of anxiety-depression, 17 cases of simple depression and 4 cases of simple anxiety. These results corresponded to the analysis of operator's socio-economic and their working conditions. Some recommendations were suggested to eliminate the negative effects of automatic work.

Cloth material and their impacts on user in hot and wet environment

A survey was conducted on 3 subjects groups (wearing 100% plain silk, 100% satin silk, and 100% polyester shirt). All participants walked ten minutes on treadmill in hot (32-34oC) and humidity (72-75%) environment. The aim of the survey was to compare the fabric advantages for users working in hot and humid ambient environment. Obtained results showed there were no significant differences neither in skin temperature nor heart rate of subjects wearing shirt made of pure silk or pure polyester fibbers. However the subjective irritating sensations were dominant in subjects wearing 100% polyester shirt, while less ratio of that was observed for subjects wearing 100% silk shirt. The average amount of sweat remained in the 100% polyester shirt was higher than that in the silk one.

Study on ralationship between muscle strain and arm positions

Study was conducted in laboratory condition for investagating the relationship between muscle strain and arm positions. Rerults showed that: the bio-potential of brachioradialis, deltoid and trapezius muscles were significant higher when the arms were elevated at haft-arm length. The trapezius had highest bio-potential than the other left. The subjective shoulder pain occurred after 15-17 mimutes of experiment. When was higher hio-potential, that the muscle pain was more obvious. The accumulation of pain can be considered as reason of that called Neck-Shoulder Disorders.