The Claim
Caffeine at a dose of 162 mg does not produce a statistically significant change in systolic or diastolic blood pressure in healthy young men, despite causing a statistically significant decrease in heart rate.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
A 162 mg dose of caffeine does not change systolic or diastolic blood pressure in healthy young men, but it does lower heart rate.
See the scientific wording
Caffeine (162 mg) does not produce a statistically significant change in systolic or diastolic blood pressure in healthy young men, despite a significant decrease in heart rate, suggesting dissociation between autonomic and vascular responses.
Caffeine blocks adenosine receptors in the brain and heart, which reduces signals that normally speed up the heart, causing the heart to beat slower. At the same time, blood vessels do not tighten or loosen because caffeine does not change the signals that control their size, so blood pressure stays the same.
What the research says
1 studyAfter drinking caffeine, the study found that guys' hearts slowed down, but their blood pressure didn't change much — meaning caffeine affects heart rhythm and blood vessels in different ways.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.