What question did this study set out to answer?

This research aims to explore how basal cortisol levels affect hormonal responses to corticotropin-releasing factor (CRF).

Plasma Adrenocorticotropin, Cortisol, and Aldosterone Responses to Corticotropin-Releasing Factor:Modulatory Effect of Basal Cortisol Levels

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Randomized trial examines hormonal responses to CRF in subjects, indicating cortisol levels influence ACTH response.

This research aims to explore how basal cortisol levels affect hormonal responses to corticotropin-releasing factor (CRF).
Administered 200 micrograms of CRF as an IV bolus to 10 normal subjects (5 men, 5 women).
Measured plasma ACTH, cortisol, and aldosterone levels at various time points post-CRF injection.
Analyzed correlations between basal cortisol levels and hormonal responses using Pearson's correlation test.
ACTH levels increased from 27 pg/ml to 63 pg/ml at 30 min post-CRF (P < 0.0005).
Cortisol levels rose from 12.3 micrograms/100 ml to 21.0 micrograms/100 ml at 60 min post-CRF (P < 0.0005).
Aldosterone levels increased from 13 ng/100 ml to 23 ng/100 ml (no specific p-value reported).

Hermus et al. (1984) studied this question.

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