Evidence map›Paper›PMID 31747465›Full record

Trial reportBritish journal of clinical pharmacology2020

Acute caffeine intake increases performance in the 15-s Wingate test during the menstrual cycle.

Beatriz Lara, Jorge Gutiérrez Hellín, Carlos Ruíz-Moreno, Blanca Romero-Moraleda, Juan Del Coso

Abstract readRandomized Controlled Trial
PubMed Full text at PMC Publisher
In one paragraph

Trial report in British journal of clinical pharmacology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 7 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
36citing papers in PubMed, 7 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

36 citing papers in PubMed, 7 syntheses or guidelines pooled it.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Beatriz LaraExercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain.ORCID 0000-0001-5516-4852
Jorge Gutiérrez HellínExercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain.ORCID 0000-0001-9721-2269
Carlos Ruíz-MorenoExercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain.
Blanca Romero-MoraledaExercise Physiology Laboratory, Camilo José Cela University, Madrid, Spain.
Juan Del CosoCentre for Sport Studies, Rey Juan Carlos University, Fuenlabrada, Spain.ORCID 0000-0002-5785-984X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimsIn male athletes, caffeine is considered an ergogenic aid to increase anaerobic performance during the Wingate anaerobic test (WANT). However, information about the effect of caffeine on WANT performance in female athletes is contradictory. Furthermore, it is unknown whether the ergogenicity of caffeine is present during all the phases of the menstrual cycle. The aim of this study was to investigate the effects of caffeine intake on WANT performance during 3 phases of the menstrual cycle.

methodsThirteen well-trained eumenorrhoeic triathletes participated in a double-blind, placebo-controlled, cross-over experimental trial. On 2 different days in each phase, and in randomized order, participants ingested caffeine (3 mg kg

resultsIn comparison to the placebo, caffeine increased peak power during the WANT in the early follicular (8.6 ± 0.8 vs 8.9 ± 0.9 W/kg, P = .04; effect size [d] = 0.45), preovulatory (8.6 ± 0.9 vs 8.9 ± 0.9 W/kg, P = .04; d = 0.23) and mid-luteal phases (8.6 ± 0.8 vs 8.9 ± 0.9 W/kg, P < .01; d = 0.52).

conclusionThe ergogenic effect of caffeine on WANT peak cycling power was of a similar magnitude in the follicular, preovulatory, and mid-luteal phases. These results suggest that caffeine increases performance in the 15-s Wingate test in women athletes and it might be considered an ergogenic aid to increase anaerobic performance in eumenorrhoeic women during their menstrual cycle.

Indexed as

CaffeinePerformance-Enhancing SubstancesCross-Over StudiesDouble-Blind MethodFemaleHumansMaleMenstrual CycleCaffeinePerformance-Enhancing Substancesergogenicityexercisemenstrual cyclephysical activitysexstimulantwomen

Identifiers

PMID31747465
PMCPMC7098873

What OpenQuestion holds

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.