Abstract
The physiological functions of man exposed for 6 hours (9.00-12.00 and 13.00-16.00) to 200 ppm concentration of toluene gas were polygraphically investigated to obtain the data substantiating the maximum allowable concentration in industrial hygiene.Subjects consisted of volunteers of healthy 10 male students (age : 18-22). They were divided into 2 groups (controls : 5 and those exposed to the gas : 5), they laid on the bet 6 hours a day, for consecutive two days and only on the 2nd day the exposure group was exposed to 200 ppm concentration of toluene gas. The functions in each subject during the last 1 hour on both days were compared, and the tendency of the phenomena for 2nd days was compared between 2 groups.Results thus obtained were as follows : 1) Evoked and spontaneous galvanic skin reflex : Any change was not observed.2) Evoked vasoconstriction by finger-plethysmography : Any change was not observed.3) Heart rate : The toluene-gas group had a tendency of statistically significant rise.4) Respiration rate : The toluene-gas group had a tendency of rise, but it was not significant statistically.5) Cerebral activity from EEG : The toluene-gas group had a tendency of rise in cerebral activity, but this was not significant statistically.
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