More than 80% of the population in the USA consume coffee each day. However there not many studies on change of heart rate variability and placebo effects after consumption of coffee. In our study we aim to test the following hypotheses: 1. Habitual caffeinated espresso coffee drinkers show an increase in blood pressure, heart rate variability and parasympathetic activity (high frequency band) of the heart. 2. Non-habitual caffeinated espresso coffee drinkers show an increase of blood pressure. The heart rate variability and the parasympathetic activity of the heart will decrease. 3. Caffeinated or decaffeinated espresso induces comparable changes in habitual or non-habitual coffee drinkers.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
TRIPLE
Enrollment
77
habitual coffee drinker provided with water
habitual coffee drinkers given decaffeinated espresso
habitual coffee drinkers given caffeinated espresso
non-habitual coffee drinkers given water
non-habitual coffee drinkers given decaffeinated espresso
non-habitual coffee drinkers given caffeinated espresso
Department of Psychosomatic Medicine and Psychotherapy, Charité University
Berlin, Germany
Heart rate variability
Time frame: 70 minutes
blood pressure
Time frame: 70 min.
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