Papers/PMID:34072182
Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.
International journal of environmental research and public health2021The record
3 findings drawn from this paper, on 1 compound across 3 endpoints, 1 of them null.
What it reported
How to read these marksWhat moved
2 findings
caffeine — increases one-repetition maximum strength
LikelyGrade B, Likely. Human evidence, limited replication or design limits.Finding“In the main meta-analysis that considered data from 6 included studies, there was a significant ergogenic effect of caffeine on 1RM strength (SMD: 0.18; 95% CI: 0.10, 0.25; p < 0.001; I2 = 0%; Figure 3).”
Quoted verbatim from Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.. - Study
- meta-analysis
- Population
- Healthy adult women; overall meta-analysis of 6 placebo-controlled crossover trials of 1RM strength
Effect 0.18 standardised mean difference, 95% CI 0.1 to 0.25
Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.2021PMID:34072182
caffeine — increases upper-body muscular strength (pooled composite)
LikelyGrade B, Likely. Human evidence, limited replication or design limits.Findingreplicated ×1“In a subgroup analysis that considered only upper-body 1RM tests, there was a significant ergogenic effect of caffeine (SMD: 0.17; 95% CI: 0.09, 0.26; p < 0.001; I2 = 0%).”
Quoted verbatim from Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.. - Study
- meta-analysis
- Population
- Healthy adult women; subgroup analysis restricted to upper-body 1RM tests (bench press, bicep curl, lat pull-down, shoulder press, row), not the overall estimate
Effect 0.17 standardised mean difference, 95% CI 0.09 to 0.26
Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.2021PMID:34072182
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“In a subgroup analysis that considered only lower-body 1RM tests, there was no significant difference between caffeine and placebo (SMD: 0.16; 95% CI: −0.03, 0.35; p = 0.109; I2 = 0%).”
Quoted verbatim from Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.. - Study
- meta-analysis
- Population
- Healthy adult women; subgroup analysis restricted to lower-body 1RM tests (squat, leg press, knee extension), not the overall estimate
Effect 0.16 standardised mean difference, 95% CI -0.03 to 0.35
Ergogenic Effects of Acute Caffeine Intake on Muscular Endurance and Muscular Strength in Women: A Meta-Analysis.2021PMID:34072182