Abstract
The effects of 90 dB(A) noise exposure and/or a calculation task on plasma cyclic AMP concentrations (physiological index) and STAI-A-State scores (psychological index) in normal subjects are compared. Neither the plasma cyclic AMP concentration nor the STAI-A-State scores showed any significant change in response to the calculation task. STAI-A-State scores increased significantly only in response to 90 dB(A) noise exposure, while both the indices showed significant increases under the effects of both noise exposure and the calculation task. The sensitivity of the rate of increase in plasma cyclic AMP caused by noise exposure plus the calculation task was higher than that of the rate of increase in scores on the A-State scale caused by this noise exposure/task combination. The physiological effect in human subjects of noise exposure became larger when a psychological stress (calculation task) was added.
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