Papers/PMID:29527137
Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.
Journal of the International Society of Sports Nutrition2018The record
2 findings drawn from this paper, on 1 compound across 2 endpoints, 1 of them null.
What it reported
How to read these marksWhat moved
1 finding
caffeine — increases upper-body muscular strength (pooled composite)
LikelyGrade B, Likely. Human evidence, limited replication or design limits.Findingreplicated ×1“A subgroup analysis indicated that caffeine significantly improves upper (SMD = 0.21; 95% CI: 0.02, 0.39; p = 0.026; Fig. 3) but not lower body strength (SMD = 0.15; 95% CI: -0.05, 0.34; p = 0.147; Fig. 4).”
Quoted verbatim from Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.. - Study
- meta-analysis
- Dose
- Acute pre-exercise ingestion (capsule, liquid or gel), mean 4.7 mg/kg, range 0.9-6 mg/kg, 45-60 min before testing
- Population
- Healthy adolescent and young-adult participants, trained and untrained, of both sexes; UPPER-BODY SUBGROUP of the pooled 1RM maximal-strength analysis, not the overall estimate. Constituent tests: bench press, machine bench press, lat pulldown.
Effect 0.21 standardised mean difference, 95% CI 0.02 to 0.39
Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.2018PMID:29527137
What did not
1 finding
caffeine — no detected effect on lower-body muscular strength (pooled composite)
LikelyGrade B, Likely. Human evidence, limited replication or design limits.FindingNull resultreplicated ×1“A subgroup analysis indicated that caffeine significantly improves upper (SMD = 0.21; 95% CI: 0.02, 0.39; p = 0.026; Fig. 3) but not lower body strength (SMD = 0.15; 95% CI: -0.05, 0.34; p = 0.147; Fig. 4).”
Quoted verbatim from Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.. - Study
- meta-analysis
- Dose
- Acute pre-exercise ingestion (capsule, liquid or gel), mean 4.8 mg/kg, range 0.9-6 mg/kg, 45-60 min before testing
- Population
- Healthy adolescent and young-adult participants, trained and untrained, of both sexes; LOWER-BODY SUBGROUP of the pooled 1RM maximal-strength analysis, not the overall estimate. Constituent tests: back squat, leg press.
Effect 0.15 standardised mean difference, 95% CI -0.05 to 0.34
Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.2018PMID:29527137