Key result
Acute caffeine intake significantly increases systolic blood pressure for 3 hours in normotensive and hypertensive men.
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Caffeine is known to raise blood pressure (BP). We examined a single oral dose of caffeine (3.3 mg/kg, equivalent to 2 to 3 cups of coffee) on BP in 18 hypertensive (HTN) and 12 age-matched, normotensive (NT) men for 3 h. Systolic BPs were significantly higher after caffeine for both groups (P < .001) for the entire 3 h. The HTN group showed persistent elevation in diastolic BP for 3 h, whereas the increment of diastolic BP became smaller in the NT group 90 min after caffeine ingestion. Our results suggest that caffeine consumption may affect both diagnosis and treatment of hypertension and abstinence from caffeine may be beneficial, especially for hypertensive individuals.
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Sung et al. (1994) studied Mild hypertension (n=30). Oral caffeine vs. Normotensive men / baseline was evaluated on Systolic and diastolic blood pressure over 3 hours (p=< .001). A single oral dose of caffeine increased systolic blood pressure for 3 hours in both mildly hypertensive and normotensive men.
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