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Study · Measured the body's own peptide · 1986

5 results

Diurnal pattern of stress-evoked neurohypophyseal hormone secretion: sexual dimorphism in rats.

Carter DA, Lightman SL

Neuroscience letters1 Nov 1986Cited by 22 (Europe PMC)

PMID3491347 (opens in a new tab)DOI10.1016/0304-3940(86)90568-9 (opens in a new tab)PepBankPUB-03491347
Publisher pagePubMedAsk about this study
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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 study5

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

Natural levels measured5

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. 01AnimalEndogenous levelAnimal study (in vivo)Other

    In rats, control plasma levels of the body's own oxytocin showed no diurnal variation.

    In plain wordsIn rats, the body's own oxytocin levels at rest did not change across the day.

    Peptide
    Oxytocin
    Outcome
    No significant changeDiurnal variation of control plasma oxytocin
    Study

    ratn: not reported in source

    male and female rats under immobilization stress
    Outcome group
    Pituitary hormones · Endocrine and hormones

    Source sentences

    Summary
    Control levels of the neurohypophyseal peptides did not exhibit diurnal variation.
    1 context sentence
    Summary · context
    Levels of oxytocin (OT) and arginine-vasopressin (AVP) in plasma of control or immobilized male and female rats were determined at various times of the day.

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

  2. 02AnimalEndogenous levelAnimal study (in vivo)Other

    In male and female rats, immobilization raised plasma levels of the body's own oxytocin at all times of day.

    In plain wordsIn rats, stress raised the body's own oxytocin levels in the blood at all times of day.

    Peptide
    Oxytocin
    Outcome
    IncreasePlasma oxytocin after immobilization
    Study

    ratn: not reported in source

    male and female rats under immobilization stress
    Comparator
    Control
    Outcome group
    Pituitary hormones · Endocrine and hormones

    Source sentences

    Summary
    Raised plasma levels of OT were found following immobilization at all times in both males and females
    1 context sentence
    Summary · context
    Levels of oxytocin (OT) and arginine-vasopressin (AVP) in plasma of control or immobilized male and female rats were determined at various times of the day.

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

  3. 03AnimalEndogenous levelAnimal study (in vivo)Other

    In rats, stressed plasma oxytocin levels varied significantly over the day in males only.

    In plain wordsIn rats, the body's own oxytocin response to stress changed across the day in males but not in females.

    Peptide
    Oxytocin
    Outcome
    MixedDiurnal variation of stress-evoked plasma oxytocin
    Study

    ratn: not reported in source

    male and female rats under immobilization stress
    Outcome group
    Pituitary hormones · Endocrine and hormones

    Source sentences

    Summary
    a significant diurnal variation in stressed levels of OT was also observed, but in male rats only
    1 context sentence
    Summary · context
    Levels of oxytocin (OT) and arginine-vasopressin (AVP) in plasma of control or immobilized male and female rats were determined at various times of the day.

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

  4. 04AnimalEndogenous levelAnimal study (in vivo)Other

    In male rats, the morning oxytocin stress responses were markedly greater than the midday and evening responses.

    In plain wordsIn male rats, the body's own oxytocin response to stress was much larger in the morning than later in the day.

    Peptide
    Oxytocin
    Outcome
    IncreaseMorning versus later oxytocin stress response in males
    Study

    ratn: not reported in source

    male and female rats under immobilization stress
    Outcome group
    Pituitary hormones · Endocrine and hormones

    Source sentences

    Summary
    Thus the morning stress responses (07.00 and 09.00 h) of males were markedly greater than the midday and evening responses, whereas the responses of females were similar throughout the day.
    1 context sentence
    Summary · context
    Levels of oxytocin (OT) and arginine-vasopressin (AVP) in plasma of control or immobilized male and female rats were determined at various times of the day.

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

  5. 05AnimalEndogenous levelAnimal study (in vivo)Other

    In female rats, the oxytocin stress responses were similar throughout the day.

    In plain wordsIn female rats, the body's own oxytocin response to stress stayed similar through the day.

    Peptide
    Oxytocin
    Outcome
    No significant changeOxytocin stress response across the day in females
    Study

    ratn: not reported in source

    male and female rats under immobilization stress
    Outcome group
    Pituitary hormones · Endocrine and hormones

    Source sentences

    Summary
    Thus the morning stress responses (07.00 and 09.00 h) of males were markedly greater than the midday and evening responses, whereas the responses of females were similar throughout the day.
    1 context sentence
    Summary · context
    Levels of oxytocin (OT) and arginine-vasopressin (AVP) in plasma of control or immobilized male and female rats were determined at various times of the day.

    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, 20:03 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 02:54 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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