Study note • PMID 32681596
Caffeine increases strength and power performance in resistance-trained females during early follicular phase.
Worth trying if it fits your goal and context.
ELI5
In plain language
The effects of 4 mg.kg(-1) caffeine ingestion on strength and power were investigated for the first time, in resistance-trained females during the early follicular phase utilizing a randomized, double-blind,… (randomized trial; n=3 trained athletes).
The abstract doesn’t indicate a clear change in Time-trial performance, Time to exhaustion under the tested conditions. Treat this as a signal, not a guarantee; confirm methods and context in the full paper.
Takeaways
What the abstract suggests
- • Study question: The effects of 4 mg.kg(-1) caffeine ingestion on strength and power were investigated for the first time, in resistance-trained females during the early follicular phase utilizing a randomized, double-blind,…
- • The abstract doesn’t indicate a clear change in Time-trial performance, Time to exhaustion under the tested conditions.
- • Population: n=3 trained athletes.
- • Protocol cues (title/abstract): 4 mg • 60 minutes • 72 hours.
Protocol
Protocol (as reported)
- • Intervention/exposure: caffeine (vs placebo).
- • Dose/time/duration cues in abstract/title: 4 mg • 60 minutes • 72 hours.
- • Outcomes: Time-trial performance, Time to exhaustion.
- • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.
Fit
Who it helps, and who should skip it
Who it helps
- • Athletes similar to the study population (n=3 trained athletes) working on supplements.
- • Athletes who can measure Time-trial performance, Time to exhaustion with a repeatable workout or time-trial effort.
Who should skip
- • If you have symptoms or conditions that make the intervention risky, get professional guidance.
- • If you’re near race day and can’t safely test, defer the experiment.
Methods
What the study actually did
- • Design: randomized trial (double-blind, placebo-controlled).
- • Population: n=3 trained athletes.
- • Comparator: placebo.
- • Outcomes measured: Time-trial performance, Time to exhaustion.
- • Protocol cues mentioned: 4 mg • 60 minutes • 72 hours.
- • Source: PubMed PMID 32681596 (2020) — Scandinavian journal of medicine & science in sports.
Results excerpt
What the abstract reports
“Caffeine significantly improved squat (4.5 +/- 1.9%, effect size [ES]: 0.25) and bench press 1RM (3.3 +/- 1.4%, ES: 0.20), and squat (15.9 +/- 17.9%, ES: 0.31) and bench press RTF (9.8 +/- 13.6%, ES: 0.31), compared to placebo.”
Note: excerpts are short; for full context, read the paper.
Limits
Limitations & bias
- • Abstract-only summaries can miss critical details (population, protocol, adherence, and context).
- • Single studies often don’t generalize to your event, history, and training load; treat results as a starting point.
- • If your context differs (elite vs recreational; cycling vs running), adjust expectations and be conservative.
- • This is performance information, not medical advice.
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