Four groups of rats were exposed to unavoidable tone-shock presentations for either 1 hr., 24 hr., 5 days, or 24 days. Upon termination of each stress-duration period, adrenal ascorbic acid (AAA) determinations were made and stomachs were inspected for ulcers. The AAA response manifested the typical adaptation function. Ulcers were not observed in any of the 4 stress-duration groups. Previous similar research was re-evaluated in the light of the present research findings.
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