Abstract
The aims of this research were to confirm the results of laboratory experiments which demonstrated that measurable physiological changes occurred in the presence of stressful stimuli and that these physiological parameters correlated very well with the subjective assessment that a person made of the stimulus. Noise and vibration measurements on four ships are discussed. Urine samples were obtained from a limited number of personnel, with a view to studying both 17-ketosteroid excretion and, as a secondary consideration, urinary volumes, both of which are believed to be sensitive to noise-induced stress. A measurable change in physiological parameters was observed on board four oil tankers, but to what part of the environment this can be attributed is not apparent and further evidence is being accumulated.
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