The Claim
In healthy young adults, a 170mg caffeine dose administered during the 10–20 minute post-exercise recovery window produces a medium effect size (d=0.59–0.70) on SDNN and LF, indicating a moderate enhancement of autonomic modulation.
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 170mg dose of caffeine taken after moderate exercise increases the variability of heart rate and low-frequency heart rate oscillations during the first 20 minutes of recovery, indicating a measurable change in autonomic nervous system activity.
See the scientific wording
In healthy young adults, a 170mg caffeine dose produces a medium effect size (d=0.59–0.70) on SDNN and LF during the 10–20 minute post-exercise recovery window, suggesting a moderate enhancement of overall autonomic modulation after moderate exercise.
Caffeine blocks a natural calming signal in the brain and heart, which lets the nervous system slow the heart down faster after exercise, making heart rhythms more balanced.
What the research says
1 studyAfter exercising, people who chewed a caffeine gum with about 170mg of caffeine had more balanced heart rhythms during recovery than those who chewed a placebo. This means their heart and nervous system returned to calm faster and more smoothly.
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.