STUDY OF ADRENOCORTICAL PHYSIOLOGY IN JET FLYING

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Abstract
A statistically significant eosinopenia occurred on days on which jet aircraft were flown in the mornings. The difference between experimental and control days was more marked in the early part of the afternoon than in the later part. The absolute values for urinary corticoid excretion were not shown to be significantly different on experimental days by comparison with control days, but when expressed in terms of corticoid excretion/body surface area they were seen to be significantly greater on the mornings of experimental days by comparison with control days. Corticoid/body surface area was not constant for different individuals. Salivary electrolyte concentration did not differ significantly on experimental days as compared with control days, but the late afternoon hour at which the single specimen was collected may have missed any change occurring earlier.