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1. It is known that, in rats, hypoxia stimulates adrenal steroidogenesis, but our understanding of the hypoxic effect on the glandular parameters remains incomplete. 2. Adrenals were collected and analysed from rats that had been exposed to hypoxic conditions for 3 weeks. 3. The results reveal increased adrenal concentrations of corticosterone, free cholesterol and total cholesterol without a change in glandular weight and protein concentration. The increased total cholesterol is primarily associated with enriched cholesteryl adrenate (CE22: 4), cholesteryl arachidonate (CE20: 4) and cholesteryl oleate (CE18: 1).