Evidence map›Paper›PMID 34090451›Full record

Trial reportJournal of the International Society of Sports Nutrition2021

Effects of 14-weeks betaine supplementation on pro-inflammatory cytokines and hematology status in professional youth soccer players during a competition season: a double blind, randomized, placebo-controlled trial.

Hadi Nobari, Jason M Cholewa, Jorge Pérez-Gómez, Alfonso Castillo-Rodríguez

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 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
–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

21 citing papers in PubMed.

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  15. OrnipuralAntioxidants (Basel, Switzerland) · 2022
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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.

Hadi NobariDepartment of Exercise Physiology, Faculty of Sport Sciences, University of Isfahan, Isfahan, 81746-7344, Iran. hadi.nobari1@gmail.com.ORCID http://orcid.org/0000-0001-7951-8977
Jason M CholewaDepartment of Exercise Physiology, College of Health 587 Sciences, University of Lynchburg, Lynchburg, 24501, VA, USA.
Jorge Pérez-GómezHEME Research Group, Faculty of Sport Sciences, University of Extremadura, Cáceres, 10003, Spain.
Alfonso Castillo-RodríguezDepartment of Physical Education and Sports, University of Granada, Granada, 18010, Spain.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveSystemic elevations in pro-inflammatory cytokines are a marker of non-functional over reaching, and betaine has been shown to reduce the secretion of pro-inflammatory cytokines in vitro. The aim of this study was to investigate the effects of betaine supplementation on tumor necrosis factor alpha (TNF-α), interleukins-1 beta (IL-1β), - 6 (IL-6) and the complete blood cell (CBC) count in professional youth soccer players during a competitive season.

methodsTwenty-nine soccer players (age, 15.5 ± 0.3 years) were randomly divided into two groups based on playing position: betaine group (BG, n = 14, 2 g/day) or placebo group (PG, n = 15). During the 14-week period, training load was matched and well-being indicators were monitored daily. The aforementioned cytokines and CBC were assessed at pre- (P1), mid- (P2), and post- (P3) season.

resultsSignificant (p < 0.05) group x time interactions were found for TNF-α, IL-1β, and IL-6. These variables were lower in the BG at P2 and P3 compared to P1, while IL-1β was greater in the PG at P3 compared to P1 (p = 0.033). The CBC count analysis showed there was significant group by time interactions for white blood cells (WBC), red blood cells (RBC), hemoglobin (Hb), and mean corpuscular hemoglobin concentration (MCHC). WBC demonstrated increases at P3 compared to P2 in PG (p = 0.034); RBC was less at P3 compared to P1 in BG (p = 0.020); Hb was greater at P2 compared to P1, whilst it was less at P3 compared to P3 for both groups. MCHC was greater at P3 and P2 compared to P1 in BG, whereas MCHC was significantly lower at P3 compared to P2 in the PG (p = 0.003).

conclusionThe results confirmed that 14 weeks of betaine supplementation prevented an increase in pro-inflammatory cytokines and WBC counts. It seems that betaine supplementation may be a useful nutritional strategy to regulate the immune response during a fatiguing soccer season.

Indexed as

Dietary SupplementsAdolescentBetaineBiomarkersBlood Cell CountCompetitive BehaviorCytokinesDouble-Blind MethodErythrocyte IndicesHemoglobinometryHumansInterleukin-1betaInterleukin-6SoccerTumor Necrosis Factor-alphaBetaineBiomarkersCytokinesIL1B protein, humanIL6 protein, humanInterleukin-1betaInterleukin-6Tumor Necrosis Factor-alphaFootballIL-1βImmune systemNonfunctional over-reachingYouth sports

Identifiers

PMID34090451
PMCPMC8180114

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.