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Study · Measured the body's own peptide · 1983

2 results

The plasma concentrations of secretin and vasoactive intestinal polypeptide (VIP) after long-term, strenuous exercise.

Oktedalen O, Opstad PK, Schaffalitzky de Muckadell OB

European journal of applied physiology and occupational physiology1 Jan 1983Cited by 10 (Europe PMC)

PMID6686128 (opens in a new tab)DOI10.1007/bf00429017 (opens in a new tab)PepBankPUB-06686128
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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 subjects after a 90-km cross-country ski race, plasma VIP was greatly increased and not normalized within 140 min, though it fell significantly after 80 min with rest.

    In plain wordsIn people after a long ski race, the body's own VIP in blood was very high and stayed high for over two hours.

    Peptide
    Vasoactive intestinal peptide (VIP, aviptadil)
    Outcome
    IncreasePlasma VIP immediately after a 90-km ski race
    Study

    n = 12

    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    The plasma concentrations of secretin and VIP were greatly increased immediately after the race, and the levels were not normalized within 140 min, though there was a significant decrease after 80 min with rest.
    2 context sentences
    Summary · context
    Twelve subjects (aged 21-38 years) participated in a 90-km cross-country ski race lasting 4.45-6.50 h.
    Summary · context
    In order to investigate a metabolic role for secretin and vasoactive intestinal polypeptide (VIP) during long-term strenuous exercise, seven of the subjects were given an oral hypertonic glucose solution while the others had no nutrient intake immediately after the race.

    This result measures the body's own Vasoactive intestinal peptide (VIP, aviptadil). Nobody was given the peptide. It is not evidence about taking it.

  2. 02HumanEndogenous levelObservational studyOther

    In subjects after a ski race, plasma VIP fell rapidly and markedly 15 min after oral glucose and returned to control levels after 15 min of glucose loading.

    In plain wordsIn people after a ski race, the body's own VIP in blood fell fast after a glucose drink.

    Peptide
    Vasoactive intestinal peptide (VIP, aviptadil)
    Outcome
    DecreasePost-race plasma VIP after oral glucose
    Study

    n = 7

    Comparator
    Control levels
    Outcome group
    Endogenous peptide levels · Endocrine and hormones

    Source sentences

    Summary
    The post-race plasma levels of secretin and VIP showed a rapid and very marked decrease 15 min after ingestion of glucose, and the plasma levels had returned to control levels 60 min and 15 min respectively after glucose loading.
    2 context sentences
    Summary · context
    Twelve subjects (aged 21-38 years) participated in a 90-km cross-country ski race lasting 4.45-6.50 h.
    Summary · context
    In order to investigate a metabolic role for secretin and vasoactive intestinal polypeptide (VIP) during long-term strenuous exercise, seven of the subjects were given an oral hypertonic glucose solution while the others had no nutrient intake immediately after the race.

    This result measures the body's own Vasoactive intestinal peptide (VIP, aviptadil). 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

    12 Oct 2026, 12:58 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 12:41 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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