MILAN, Italy – Chronic coffee consuption has been reported to be associated with a modest but significant increase in blood pressure (BP), although some recent studies have shown the opposite. These data, however, largely refer to clinic BP and virtually no study evaluated cross-sectionally the association between chronic coffee consuption, out-of-office BP and BP variability.
The effect of coffee on blood pressure
In 2045 subjects belonging to the population of the Pressioni Arteriose Monitorate E Loro Associazioni (PAMELA) study, have been analyzed cross-sectionally the association between clinic, 24-hour, home BP and BP variability and level of chronic coffee consumption.
Results show that when adjusted for confounders (age, gender, body mass index, cigarette smoking, physical activity and alcohol drinking) chronic coffee consumption does not appear to have any major lowering effect on BP values, particulary when they are assessed via 24-hour ambulatory (0 Cup/day: 118.5±0.7/72.8±0.4 mmHg vs 3 cups/day: 120.2±0.4/74.8±0.3 mmHg, P=NS) or home BP monitoring (0 cup/day: 124.1±1.2/75.4±0.7 mmHg vs 3 cups/day: 123.3±0.6/76.4±0.36 mmHg, P=NS).
However, daytime BP was significantly higher in coffee consumers (about 2 mmHg), suggesting some pressor effects of coffee which vanish during nighttime. Both BP and HR 24-hour HR variability were unaffected.
Thus chronic coffee consumption does not appear to have any major lowering effect either on absolute BP values, particulary when they are assessed via 24-hour ambulatory or home BP monitoring, or on 24-hour BP variability.