The Claim
Caffeine ingestion increases plasma caffeine concentration to a similar extent in the morning and afternoon in resistance-trained males, while tympanic temperature remains consistently lower in the morning compared to the afternoon irrespective of caffeine intake.
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 resistance-trained men, drinking caffeine raises blood caffeine levels equally in the morning and afternoon, but body temperature in the ear is lower in the morning than in the afternoon regardless of whether caffeine is consumed.
See the scientific wording
Caffeine ingestion increases plasma caffeine concentration similarly in the morning and afternoon in resistance-trained males, but morning tympanic temperature remains lower than afternoon temperature regardless of caffeine intake.
When someone drinks caffeine, it enters the bloodstream and reaches the same level in the body no matter what time of day it is. But the body's internal temperature stays lower in the morning and higher in the afternoon regardless of caffeine, because the body's daily rhythm controls temperature independently of caffeine.
What the research says
1 studyStudy: Improvements on neuromuscular performance with caffeine ingestion depend on the time-of-day.
When men who lift weights take caffeine, their blood caffeine levels go up the same whether they take it in the morning or afternoon. But their body temperature stays cooler in the morning no matter when they take the 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.