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Original Articles

Caffeine may potentiate adrenocortical stress responses in hypertension-prone men.

W R Lovallo, G A Pincomb, B H Sung, R B Passey, K P Sausen, M F Wilson
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https://doi.org/10.1161/01.HYP.14.2.170
Hypertension. 1989;14:170-176
Originally published August 1, 1989
W R Lovallo
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G A Pincomb
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B H Sung
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R B Passey
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K P Sausen
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M F Wilson
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Abstract

The effect of caffeine on blood cortisol levels and blood pressures was examined during rest and in response to a challenging psychomotor task in men with a low versus high risk of essential hypertension. Thirty-four healthy men ages 21-35 years were selected such that 17 were at high risk for hypertension (positive parental history and screening blood pressures of 135/85-155/95 mm Hg) and 17 were at low risk (negative parental history and no pressures above 132/84 mm Hg). Testing consisted of quiet rest (20 minutes); oral placebo (grapefruit juice) or caffeine administration (3.3 mg/kg in grapefruit juice); rest during a postdrug absorption period (40 minutes); work on an unsignalled simple reaction time task (15 minutes); and quiet rest (20 minutes). Blood pressures were recorded at 2-minute intervals, and blood samples were withdrawn via an indwelling catheter at the end of the baseline, drug absorption, task, and recovery periods. The combination of task plus caffeine produced the highest blood pressures in men at risk for hypertension. Cortisol levels were found to be sustained during rest in members of the high risk group after they had consumed caffeine, whereas members of the low risk group showed a modest decline. The high risk subjects also showed a significant rise in cortisol during (+3.7 micrograms/dl) and after (+4.0 micrograms/dl) work on the reaction time task after caffeine consumption.(ABSTRACT TRUNCATED AT 250 WORDS)

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Hypertension
August 1989, Volume 14, Issue 2
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    Caffeine may potentiate adrenocortical stress responses in hypertension-prone men.
    W R Lovallo, G A Pincomb, B H Sung, R B Passey, K P Sausen and M F Wilson
    Hypertension. 1989;14:170-176, originally published August 1, 1989
    https://doi.org/10.1161/01.HYP.14.2.170

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    Caffeine may potentiate adrenocortical stress responses in hypertension-prone men.
    W R Lovallo, G A Pincomb, B H Sung, R B Passey, K P Sausen and M F Wilson
    Hypertension. 1989;14:170-176, originally published August 1, 1989
    https://doi.org/10.1161/01.HYP.14.2.170
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