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In vivo og in vitro anabolske potentiale af essentielle aminosyrer efter modstandstræning (DiEx)

5. november 2026 opdateret af: Daniel Moore, University of Toronto

This study seeks to investigate the anabolic potential of a dileucine-enriched essential amino acid (EAA) formulation compared with a branched chain amino acid (BCAA) alternative and a collagen beverage on muscle protein anabolism and catabolism following a bout of resistance exercise training. To do this, investigators will employ a novel 'breath test' method developed in our laboratory as well as blood and urine sampling. The results of this study will allow us to better understand the anabolic potential of dileucine which could have implications for people engaging in regular resistance training (such as athletes) as well as people that need to preserve muscle mass (older people who are susceptible to anabolic resistance and sarcopenia, or muscle wasting).

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

12

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Ontario
      • Toronto, Ontario, Canada, M5S2C9
        • Goldring Centre for High Performance Sport at the University of Toronto

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 35 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Trained individuals currently performing structured exercise (e.g., running, weightlifting, team-sport activity) at least 2 days per week for the previous 3 months

Exclusion Criteria:

  • Inability to perform physical activity as determined by the PAR-Q
  • Inability to adhere to protocol guidelines (e.g., alcohol, habitual diet)
  • Regular tobacco use
  • Illicit drug use (e.g., growth hormone, testosterone, etc.)
  • Diagnosed medical condition under the care of a physician (e.g. type 2 diabetes)
  • Inability to abstain from supplements (e.g. protein, creatine, HMB, BCAA, phosphatidic acid, etc.) at least three weeks before the trial
  • Individuals on any medications known to affect protein metabolism (e.g., corticosteroids, non-steroidal anti-inflammatories, or prescription-strength acne medications)
  • Participants that are amenorrheic (females only)
  • On medications that may interfere with protein metabolism (e.g. anti-inflammatory drugs, hormone therapy)
  • Regular tobacco use (e.g. daily use of oral or inhaled tobacco)
  • Illicit drug use (e.g. growth hormone, testosterone, etc.)
  • Inability to comply with the study protocol as judged by the investigators

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Tredobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Di-Leucine supplement

Participants will consume a amino acid supplement containing Di-Leucine following resistance exercise and their whole body anabolism will be determined over the subsequent 6 hours

Participants will consume a amino acid supplement containing Di-Leucine following resistance exercise and their whole body anabolism will be determined over the subsequent 6 hours

Eksperimentel: BCAA Supplement

Participants will consume a amino acid supplement containing branched chain amino acids (BCAA) following resistance exercise and their whole body anabolism will be determined over the subsequent hours

Participants will consume a amino acid supplement containing branched chain amino acids (BCAA) following resistance exercise and their whole body anabolism will be determined over the subsequent hours

Eksperimentel: Collagen Supplement

Participants will consume a amino acid supplement containing collagen protein following resistance exercise and their whole body anabolism will be determined over the subsequent hours

Participants will consume a amino acid supplement containing Collagen protein following resistance exercise and their whole body anabolism will be determined over the subsequent hours

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Whole-Body Protein Synthesis
Tidsramme: 6 hours

Investigators will measure the enrichment of [13CO2] in the breath by isotope ratio mass spectrometry (IRMS) in atom percent excess (APE). The measurement of carbon dioxide production (VCO2) and stable isotope tracer enrichment in the breath allows for the assessment of the rate at which amino acids are used for energy (i.e., oxidized), rather than for protein synthesis (i.e., retained in the body) by calculating the fraction of expired CO2 that contains 13C. Leucine retention (umol/kg) will then be calculated from the difference between the known amount of leucine provided (ingested) and leucine oxidation (as determined from 13CO2 breath enrichment).

6 hours

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Urinary Measures (Muscle Protein Breakdown)
Tidsramme: 6 hours

Investigators will measure urinary 3-methylhistidine (3MH) as an indirect marker of muscle protein breakdown over the course of the trial (6 hours) through pooled urine collection vs baseline urine.

6 hours
Murine Cell-Based Experiments (ex-vivo experiments) -hypertrophy
Tidsramme: 60 minutes

Investigators will use human serum obtained from fasted and fed timepoints (15, 30, 45 and 60 minutes following beverage consumption) to condition cell culture media (20% volume). To determine the effects of using fasted and/or fed 'human-conditioned' culture media on cell growth, myotube diameter (hypertrophy) will be measured via microscopy following short term (4 hours) and long-term (24 hour) incubation in the human conditioned culture media.

60 minutes
Murine Cell-Based Experiments (ex-vivo experiments) - Protein Synthesis
Tidsramme: 60 minutes

Investigators will use human serum obtained from fasted and fed timepoints (15, 30, 45 and 60 minutes following beverage consumption) to condition cell culture media (20% volume). To determine the effects of using fasted and/or fed 'human-conditioned' culture media on cell protein synthesis, puromycin incorporation (measure of protein synthesis) will be measured via western blot.

60 minutes
Murine Cell-Based Experiments (ex-vivo experiments) - mTORC1 Signalling
Tidsramme: 60 minutes

Investigators will use human serum obtained from fasted and fed timepoints (15, 30, 45 and 60 minutes following beverage consumption) to condition cell culture media (20% volume). To determine the effects of using fasted and/or fed 'human-conditioned' culture media on cell anabolic signalling mTORC1 signalling will be measured via western blot.

60 minutes

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

21. januar 2023

Primær færdiggørelse (Faktiske)

30. juli 2024

Studieafslutning (Faktiske)

31. december 2025

Datoer for studieregistrering

Først indsendt

31. januar 2023

Først indsendt, der opfyldte QC-kriterier

21. februar 2023

Først opslået (Faktiske)

3. marts 2023

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

9. november 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

5. november 2026

Sidst verificeret

1. november 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • DiEx

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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