Evidence map›Paper›PMID 33462306›Full record

ArticleScientific reports2021

Differential effects on blood and cerebrospinal fluid immune protein markers and kynurenine pathway metabolites from aerobic physical exercise in healthy subjects.

Josef Isung, Mathias Granqvist, Ada Trepci, Jesse Huang, Lilly Schwieler, Marie Kierkegaard, Sophie Erhardt, Jussi Jokinen, Fredrik Piehl

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed, 3 pooled it
1.7field-weighted citation impact, top 18% 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

22 citing papers in PubMed, 3 syntheses or guidelines pooled it, 33 citations in OpenAlex.

  1. A Single Exercise Session Elicits a Transient Kynurenine Metabolic Signature in Health and Disease: A Systematic Review and Meta-Analysis.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2026
    Pooled it
  2. Pooled it
  3. BrainFrontiers in immunology · 2021
    Pooled it
  4. Trial
  5. Trial
  6. Review
  7. Review
  8. Article
  9. Review
  10. Article
  11. Review
  12. Article
  13. Article
  14. Review
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article
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

9 authors at 3 institutions in 1 country.

Josef Isung *Centre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, and Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden. josef.isung@ki.se.
Mathias Granqvist *Division of Physiotherapy, Division of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, and Academic Specialist Center, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Ada TrepciDepartment of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
Jesse HuangDivision of Physiotherapy, Division of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, and Academic Specialist Center, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Lilly SchwielerDepartment of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
Marie KierkegaardDepartment of Neurobiology, Care Sciences and Society, Karolinska Institutet and Academic Specialist Center, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Sophie ErhardtDepartment of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
Jussi JokinenCentre for Psychiatry Research, Department of Clinical Neuroscience, Karolinska Institutet, and Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Fredrik PiehlDivision of Physiotherapy, Division of Neurology, Department of Clinical Neuroscience, Karolinska Institutet, and Academic Specialist Center, Stockholm Health Care Services, Region Stockholm, Stockholm, Sweden.
Karolinska Institutet · SEStockholm Health Care Services · SEUmeå University · SE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Mounting evidence shows that physical exercise modulates systemic inflammation. However, its effect on cerebrospinal fluid (CSF) immune-marker profiles in man are largely unknown. We here report a study on healthy subjects (n = 27, males = 12, mean age 28.7, range 22-52) allocated to either an acute exercise setting over four consecutive days, or a training intervention over 4 weeks. Paired plasma and CSF samples collected at baseline, after 7 days of exercise abstention, and the day after completion of the exercise interventions, were analyzed for protein inflammation markers using a multiplex proximity extension assay and neurotransmitters and kynurenine pathway (KP) metabolites using liquid chromatography, respectively. Routine cell counts, and albumin, immunoglobulin G and neurofilament light chain concentrations in CSF remained unchanged in both paradigms, while several inflammatory proteins became upregulated after acute exercise. However, only changes in three CSF (vascular endothelial growth factor-A, interleukin-7 and matrix metalloproteinase-10) and 12 plasma proteins reached significance levels after adjustment for multiple comparisons and exclusion of less stable proteins. Similarly, KP metabolites only changed among participants after acute exercise, while neurotransmitter levels, except for increased CSF serine, remained stable. Both in plasma and CSF changes in KP metabolites and inflammatory proteins correlated, suggesting that these processes are functionally linked. These findings suggest that acute aerobic physical exercise affects immune markers and KP metabolites systemically and in the CSF.

Indexed as

AdultBiomarkersChromatography, LiquidExerciseFemaleHumansInflammationKynurenineMaleMiddle AgedVascular Endothelial Growth Factor AYoung AdultBiomarkersKynurenineVascular Endothelial Growth Factor AVEGFA protein, human

Identifiers

PMID33462306
PMCPMC7814004
OpenAlexW3121623989

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.