The Study
Effects of caffeine on early morning physical and cognitive performance
This study looked at whether drinking coffee in the morning helps people do better on tests and physical tasks. But we don’t know if the people were randomly assigned to drink coffee or not, so we can’t say coffee definitely caused any changes — it might just be a coincidence.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study tested if drinking caffeine in the morning helps young men perform better in physical tasks like jumping and gripping, and mental tasks like focusing, compared to not having caffeine.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 527 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Not specified in abstract
- 2Not specified in abstract
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Graduate Journal of Sports Science, Coaching, Management, & Rehabilitation
Year
2024
Authors
Michael Chadwick
Related Content
Claims (4)
Drinking caffeine in the morning increases core body temperature and enhances physical performance. Regular caffeine use over time does not affect muscle growth because the body adapts to its presence.
In healthy young adult males, consuming caffeine at 7:00 a.m. is linked to improved performance in tests of explosive strength and agility compared to not consuming caffeine.
In healthy young adult males, consuming caffeine at 7:00 a.m. is associated with measurable changes in attention and executive function during the Stroop test compared to not consuming caffeine.
Healthy young men perform worse on strength and power tasks in the early morning compared to the evening, and consuming caffeine can improve morning performance to match evening levels.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.