The Claim
Changes in low-frequency power in heart rate variability are correlated with changes in resting state EEG patterns following ingestion of a low-dose caffeine energy supplement in adults.
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.
In adults, changes in heart rate variability at low frequencies are associated with changes in brainwave patterns during rest after consuming a low-dose caffeine energy supplement.
See the scientific wording
Changes in low-frequency (LF) power in heart rate variability are correlated with changes in resting state EEG patterns following ingestion of a low-dose caffeine energy supplement in adults, suggesting a potential link between autonomic and central nervous system responses.
Caffeine blocks a natural calming signal in the brain, making brain cells more active. This increased brain activity sends signals to the brainstem, which turns up the heart's sympathetic response. The heart beats with more variation in the low-frequency range, and this change matches the pattern of brain activity seen on an EEG.
What the research says
1 studyThis study found that when adults took a small-energy drink with a little caffeine, their heart rhythms and brain waves changed together, suggesting the heart and brain respond as a team to caffeine.
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.