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Study · Measured the body's own peptide · 2009

1 result

Effects of different intensities of resistance exercise on regulators of myogenesis.

Wilborn CD, Taylor LW, Greenwood M, Kreider RB, Willoughby DS

Journal of strength and conditioning research1 Nov 2009Cited by 58 (Europe PMC)

PMID19826309 (opens in a new tab)DOI10.1519/jsc.0b013e3181bab493 (opens in a new tab)PepBankPUB-19826309
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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 study1

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

Natural levels measured1

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 levelNon-randomized trialOther

    In male participants, vastus lateralis MGF mRNA rose by 2 hours after resistance exercise at both 60-65% and 80-85% of 1RM.

    In plain wordsIn men, the body's own MGF mRNA in thigh muscle rose within hours after weight-lifting exercise at both intensities.

    Peptide
    MGF / PEG-MGF
    Outcome
    IncreaseMGF mRNA after resistance exercise
    Study

    n = 13

    Outcome group
    Growth hormone and IGF-1 · Musculoskeletal

    Source sentences

    Summary
    For both intensities, MHC type IIX, IGF-1, IGF-R1, MGF, Myo-D, myogenin, MRF-4, and myf5 mRNA were all significantly increased in response to resistance exercise by 2 hours after exercise, whereas myostatin and the cyclin-dependent kinase inhibitor p27(kip) were decreased at 2 hours after exercise (p < 0.05).
    2 context sentences
    Summary · context
    Thirteen male participants (21.5 +/- 2.9 years, 86.1 +/- 19.5 kg, 69.7 +/- 2.7 in.) completed bouts of resistance exercise involving 4 sets of 18-20 repetitions with 60-65% 1 repetition maximum (1RM) and 4 sets of 8-10 repetitions with 80-85% 1RM.
    Summary · context
    Vastus lateralis biopsies were obtained immediately before exercise, and at 30 minutes, 2 hours, and 6 hours after each bout.

    This result measures the body's own MGF / PEG-MGF. 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

    13 Oct 2026, 21:44 UTC

    Study results updated

  2. Version 1

    13 Oct 2026, 16:31 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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