The Claim
The ergogenic effect of caffeine on cycling performance is not mediated by differences in serum caffeine concentration between morning and evening trials, as serum caffeine concentrations were statistically similar regardless of time of day.
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.
Caffeine improves cycling performance equally in the morning and evening, and this effect is not due to differences in how much caffeine is in the blood at those times.
See the scientific wording
Caffeine’s ergogenic effect on cycling performance is not explained by differences in serum caffeine concentration between morning and evening trials, as levels were similar regardless of time of day.
Caffeine blocks a natural chemical in the body that slows down muscle signaling, allowing muscles to contract more efficiently during prolonged cycling, especially when the effort is steady and not all-out.
What the research says
1 studyThe study gave people the same amount of caffeine in the morning and evening, and they performed better at different times — even though the caffeine in their blood was probably the same. So the difference in performance must be because of their body’s internal clock or how tired they were, not how much caffeine was in their system.
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.