Evidence map›Paper›PMID 34098993›Full record

Trial reportJournal of the International Society of Sports Nutrition2021

Effects of antioxidant supplementation on oxidative stress balance in young footballers- a randomized double-blind trial.

Błażej Stankiewicz, Mirosława Cieślicka, Sławomir Kujawski, Elżbieta Piskorska, Tomasz Kowalik, Justyna Korycka, Anna Skarpańska-Stejnborn

Abstract readRandomized Controlled Trial
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 22 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 4 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

22 citing papers in PubMed, 4 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Pooled it
  5. Trial
  6. Trial
  7. Review
  8. A Review ofFoods (Basel, Switzerland) · 2026
    Review
  9. Polyphenols, Polysaccharides, and Their Complexes fromMolecules (Basel, Switzerland) · 2025
    Review
  10. Article
  11. Review
  12. Article
  13. Review
  14. Review
  15. Review
  16. Article
  17. Article
  18. Article
  19. Body Loading during an Intensive Yoga Exercise Routine and a Cycle Ergometer Test.International journal of environmental research and public health · 2023
    Article
  20. Review
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

7 authors.

Błażej StankiewiczInstitute of Physical Education, Kazimierz Wielki University in Bydgoszcz, 2 Sportowa Str., 85-091, Bydgoszcz, Poland.
Mirosława CieślickaDepartment of Physiology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 24 Karłowicza Str, 85-092, Bydgoszcz, Poland.
Sławomir KujawskiDepartment of Hygiene, Epidemiology, Ergonomy and Postgraduate Education, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 9 M. Curie Skłodowskiej Str., 85-094, Bydgoszcz, Poland.
Elżbieta PiskorskaDepartment of Pathobiochemistry and Clinical Chemistry, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, 9 M. Curie Skłodowskiej Str., 85-094, Bydgoszcz, Poland.
Tomasz KowalikInstitute of Physical Education, Kazimierz Wielki University in Bydgoszcz, 2 Sportowa Str., 85-091, Bydgoszcz, Poland.
Justyna KoryckaInstitute of Food Sciences and Agrotechnics, University of Zielona Góra, Off-Campus Faculty in Sulechów, Pałac Kalsk - Kalsk 67, 66-100, Sulechów, Poland.
Anna Skarpańska-StejnbornDepartment of Morphological and Health Sciences, Faculty of Physical Culture in Gorzów Wielkopolski, 13 Estkowskiego Str, 66-400, Gorzów Wielkopolski, Poland. ankass@poczta.onet.pl.ORCID http://orcid.org/0000-0002-7795-3550

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundIntensive physical exercise that competitive sports athletes participate in can negatively affect their pro-oxidative-antioxidant balance. Compounds with high antioxidant potential, such as those present in chokeberry (Aronia melanocarpa), can prevent these adverse changes. We here investigated the effect of antioxidant supplementation on oxidative stress balance in young footballers.

methodsThe study was designed as a double-blind randomized trial. Diet of a group of young football players (male; n = 20; mean age, 15.8 years-old) was supplemented with 200 ml of chokeberry juice per day, for 7 weeks. The players were randomly assigned to the experimental (supplemented, FP-S; n = 12) and control (placebo, FB-C; n = 8) groups. Before and after the supplementation period, the participants performed a beep test. Venous blood was sampled for serum analysis before, immediately after, 3 h, and 24 h after the beep test. Serum levels of thiobarbituric acid reactive products, 8-hydroxy-2'-deoxyguanosine, total antioxidant capacity, iron, hepcidin, ferritin, myoglobin, and albumin, and morphological blood parameters (red blood cells, (RBC), haemoglobin (HGB), haematocrit (HCT) mean corpuscular volume (MCV) mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), and lactic acid) were determined.

resultsChokeberry juice supplementation did not significantly affect the outcome of the beep test. The supplementation did not significantly affect any of the morphological, biochemical, or performance parameters analysed.

conclusionsChokeberry juice supplementation did not affect the measured parameters in the studied population, which may indicate insufficient antioxidant capacity of the juice.

Indexed as

Dietary SupplementsOxidative StressAdolescentAntioxidantsBiomarkersBody Mass IndexDouble-Blind MethodFruit and Vegetable JuicesHematologic TestsHepcidinsHumansIronMalePhotiniaSerum AlbuminSoccerAntioxidantsBiomarkersHepcidinsIronSerum AlbuminAthletesDiet supplementExerciseFootball playersRadical oxygen speciesTotal antioxidant capacity

Identifiers

PMID34098993
PMCPMC8185910

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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.