Clinical Effects of Noise and Mechanical Vibrations of a Turbo-jet Engine on Man

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Abstract
Ten subjects were placed on a concrete deck in various positions on one side of a General Electric 1-16 turbo-jet engine mounted on a steel test stand bolted to the deck. The subjects were exposed to the engine''s vibrations for a total of 20 hrs. over a period of 6 weeks. Various physiological and psychological tests were made on each subject before, during and after the exptl. periods. Ears were protected by special head-phone assemblies. Results were as follows: (a) increase in fatigue and irritability in 7 subjects; (b) early, temporary, sharp decrease in auditory acuity in the "conversational frequency range" of 512-4096 cps.; (c) rise in fasting blood sugar during a 1-hr. exposure and a decrease after a 2-hr. exposure; (d) no changes in blood counts, urinalyses, renal function, bleeding and clotting times, icteric indices, gastro-enteric functions, ecg or eeg. The relation of these data to those of other workers is discussed.

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