Evidence map›Paper›PMID 33781269›Full record

Trial reportJournal of the International Society of Sports Nutrition2021

The effects of different doses of caffeine on maximal strength and strength-endurance in women habituated to caffeine.

Aleksandra Filip-Stachnik, Michal Wilk, Michal Krzysztofik, Ewelina Lulińska, James J Tufano, Adam Zajac, Petr Stastny, Juan Del Coso

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

Trial report in Journal of the International Society of Sports Nutrition, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers, 6 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed, 6 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

29 citing papers in PubMed, 6 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

8 authors.

Aleksandra Filip-StachnikInstitute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, ul. Mikolowska 72a, 40-065, Katowice, Poland.
Michal WilkInstitute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, ul. Mikolowska 72a, 40-065, Katowice, Poland. m.wilk@awf.katowice.pl.
Michal KrzysztofikInstitute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, ul. Mikolowska 72a, 40-065, Katowice, Poland.
Ewelina LulińskaFaculty of Physical Education, Gdansk University of Physical Education and Sport, 80-336, Gdansk, Poland.
James J TufanoFaculty of Physical Education and Sport, Charles University, Prague, Czech Republic.
Adam ZajacInstitute of Sport Sciences, The Jerzy Kukuczka Academy of Physical Education in Katowice, ul. Mikolowska 72a, 40-065, Katowice, Poland.
Petr StastnyFaculty of Physical Education and Sport, Charles University, Prague, Czech Republic.
Juan Del CosoCentre for Sport Studies, Rey Juan Carlos University, Fuenlabrada, Spain.

Funding

Charles University UNCE/HUM/032
6 · The paper itself

Abstract

purposeThe main goal of this study was to assess the acute effects of 3 and 6 mg of caffeine intake per kg of body mass (b.m.) on maximal strength and strength-endurance in women habituated to caffeine.

methodsTwenty-one healthy resistance-trained female students (23.0 ± 0.9 years, body mass: 59.0 ± 6.6 kg), with a daily caffeine intake of 5.8 ± 2.6 mg/kg/b.m. participated in a randomized, crossover, double-blind design. Each participant performed three experimental sessions after ingesting either a placebo (PLAC) or 3 mg/kg/b.m. (CAF-3) and 6 mg/kg/b.m. (CAF-6) of caffeine. In each experimental session, the participants underwent a 1RM test and a strength-endurance test at 50 %1RM in the bench press exercise. Maximal load was measured in the 1RM test and the time under tension, number of preformed repetitions, power output and bar velocity were registered in the strength-endurance test.

resultsThe one-way ANOVA showed a main effect of caffeine on 1RM bench press performance (F = 14.74; p < 0.01). In comparison to the PLAC (40.48 ± 9.21 kg), CAF-3 (41.68 ± 8.98 kg; p = 0.01) and CAF-6 (42.98 ± 8.79 kg; p < 0.01) increased 1RM bench press test results. There was also a significant increase in 1RM for CAF-6 when compared to CAF-3 (p < 0.01). There was a main effect of caffeine on time under tension during the strength-endurance test (F = 13.09; p < 0.01). In comparison to the PLAC (53.52 ± 11.44 s), CAF-6 (61.76 ± 15.39 s; p < 0.01) significantly increased the time under tension during the maximal strength-endurance test.

conclusionAn acute dose of 3-to-6 mg/kg/b.m. of caffeine improves maximum strength. However, these doses of caffeine had minimal ergogenic effect on strength-endurance performance in women habituated to caffeine.

Indexed as

Administration, OralCaffeineCross-Over StudiesDouble-Blind MethodDrinking BehaviorFemaleHumansMuscle StrengthPerformance-Enhancing SubstancesPhysical EnduranceYoung AdultCaffeinePerformance-Enhancing Substances1RM testBench PressErgogenic substancesResistance exerciseTime under Tension

Identifiers

PMID33781269
PMCPMC8008648

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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.