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Study · Measured the body's own peptide · 2008

2 results

Osmotic and nonosmotic regulation of arginine vasopressin during prolonged endurance exercise.

Hew-Butler T, Jordaan E, Stuempfle KJ, Speedy DB, Siegel AJ, Noakes TD, Soldin SJ, Verbalis JG

The Journal of clinical endocrinology and metabolism18 Mar 2008Cited by 77 (Europe PMC)

PMID18349067 (opens in a new tab)PMCIDPMC2435641 (opens in a new tab)DOI10.1210/jc.2007-2336 (opens in a new tab)PepBankPUB-18349067
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Summary

The text of this summary is not shown here, because the article license does not allow reuse. Read it at the source (opens in a new tab)

Text rights: Publisher copyright. Results still quote short attributed sentences.

Results from this study2

No result from this study comes from a test of the peptide.

Natural levels measured2

These results measure the body's own peptide. Nobody was given the peptide. They are not evidence about taking it. They are left out of key results, evidence counts and charts.

  1. 01HumanEndogenous levelObservational studyOther

    In runners of a 56-km ultramarathon, the body's own plasma oxytocin rose 1.9-fold after the race.

    In plain wordsIn ultramarathon runners, the body's own oxytocin levels rose after the race.

    Peptide
    Oxytocin
    Outcome
    IncreasePlasma oxytocin after an ultramarathon
    Study

    n = 82

    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Measurements

    Plasma oxytocin change
    1.9 fold
    after ultramarathon

    Source sentences

    Summary
    Increases in the plasma (AVP)(p) (3.9-fold), oxytocin (1.9-fold), brain natriuretic peptide (4.5-fold), and IL-6 (12.5-fold) were highly significant (P < 0.0001).
    2 context sentences
    Summary · context
    The study setting was a 56-km ultramarathon.
    Summary · context
    Eighty-two runners participated in the study.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

  2. 02HumanEndogenous levelObservational studyOther

    In ultramarathon runners, changes in the body's own oxytocin, with brain natriuretic peptide and corticosterone, were associated with 47% of the variance in plasma AVP.

    In plain wordsIn ultramarathon runners, changes in the body's own oxytocin were linked to changes in vasopressin levels.

    Peptide
    Oxytocin
    Outcome
    Not applicableAssociation of oxytocin change with plasma AVP and sodium
    Study

    n = 82

    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    Changes in brain natriuretic peptide, oxytocin, and corticosterone were associated with 47% of the variance noted in (AVP)(p) and 13% of the variance in plasma [Na(+)] in pathway analyses.
    2 context sentences
    Summary · context
    The study setting was a 56-km ultramarathon.
    Summary · context
    Eighty-two runners participated in the study.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

AI wrote and checked these results. AI can make mistakes, so check important results against the source.

Version history

PepBank keeps every version of the data on this study. Status changes from Retraction Watch, Europe PMC and Crossref are listed with their source.

  1. Version 2Current

    11 Oct 2026, 01:30 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 02:51 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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