Evidence map›Paper›PMID 27980499›Full record

Trial reportJournal of the International Society of Sports Nutrition2016

The influence of caffeine ingestion on strength and power performance in female team-sport players.

Ajmol Ali, Jemma O'Donnell, Andrew Foskett, Kay Rutherfurd-Markwick

Open access · goldAbstract readRandomized Controlled Trial
PubMed Full text at PMC Publisher
In one paragraph

Trial report in Journal of the International Society of Sports Nutrition, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers, 9 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
32citing papers in PubMed, 9 pooled it
2.1field-weighted citation impact, top 14% of its field
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

32 citing papers in PubMed, 9 syntheses or guidelines pooled it, 56 citations in OpenAlex.

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  9. Effects of caffeine intake on muscle strength and power: a systematic review and meta-analysis.Journal of the International Society of Sports Nutrition · 2018
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  10. Caffeine's influence on vertical jump height: a real-life collegiate student-athlete approach.Journal of the International Society of Sports Nutrition · 2025
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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

4 authors at 1 institution in 1 country.

Ajmol AliSchool of Sport and Exercise, Massey University, Auckland, New Zealand.ORCID 0000-0002-6093-1435
Jemma O'DonnellSchool of Sport and Exercise, Massey University, Auckland, New Zealand.
Andrew FoskettSchool of Sport and Exercise, Massey University, Auckland, New Zealand.
Kay Rutherfurd-MarkwickSchool of Food and Nutrition, Massey University, Auckland, New Zealand.
University of Auckland · NZ

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe aim of this study was to examine the influence of caffeine supplementation on knee flexor and knee extensor strength before, during and after intermittent running exercise in female team-sport players taking oral contraceptive steroids (OCS).

methodTen healthy females (24 ± 4 years; 59.7 ± 3.5 kg; undertaking 2-6 training sessions per week) taking low-dose monophasic oral contraceptives of the same hormonal composition took part in a randomised, double-blind, placebo-controlled crossover-design trial. Sixty minutes following the ingestion of a capsule containing 6 mg∙kg

resultsCaffeine supplementation significantly increased eccentric strength of the knee flexors (

conclusionCaffeine supplementation increased eccentric strength and power in female team-sport players taking OCS both during an intermittent running protocol and the following morning.

Indexed as

SportsAdultAthletic PerformanceCaffeineCross-Over StudiesDouble-Blind MethodExerciseFemaleHumansKneeMuscle, SkeletalMuscle StrengthPlacebosRunningYoung AdultCaffeinePlacebosKnee extensorsKnee flexorsMuscle functionPharmacological ergogenic aidSupplementation

Identifiers

PMID27980499
PMCPMC5139084
OpenAlexW2559752097

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.