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EXIT: Prospective Study of the Response to Exercise (EXIT)

29. marts 2016 opdateret af: Jon McGavock, University of Manitoba

Exercise and Irisin Trial (EXIT): Prospective Cohort Study of the Determinants of the Metabolic Response to Exercise in Obese Adolescents

Background :

Regular exercise is a cornerstone in the prevention and the management of comorbidities. Unfortunately, the metabolic benefit of exercise training is not universal and varies among individuals. A main factor likely to explain the exercise training variability is the lack of empirical evidence on the determinants of exercise training. A series of muscle-derived cytokines have recently been discovered that (1) are released during exercise and (2) exert positive effects on peripheral tissues. Irisin is one of these novel "myokines" and might contributes to the metabolic adaptations to exercise training.

Methods:

The investigators will perform a pilot cohort study in which obese adolescents will perform resistance exercise training for 6 weeks. The main exposure variable will be the acute release of irisin during resistance exercise. The main outcome measures will be the change in hepatic triglyceride content and glucose area under the curve during a 75g, 2-hour oral glucose tolerance test.

Study Hypothesis:

The primary overall hypothesis is that the change in plasma Irisin with a single bout of exercise will be associated with the metabolic adaptations to 6 weeks of resistance training, specifically, the reductions in hepatic triglyceride content and post-prandial glucose excursions, in obese adolescents.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Observationel

Tilmelding (Faktiske)

15

Kontakter og lokationer

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

Studiesteder

  • Canada
      • Winnipeg, Canada
        • The Manitoba Institute of Child Health

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

12 år til 18 år (Barn, Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

A community-based convenient sample of overweight adolescents aged 12-18 years with a BMI > 95th centile for age and sex.

Beskrivelse

Inclusion Criteria:

  1. Adolescents (12-18 years)
  2. Body mass index considered obese according to the International Obesity Task Force

Exclusion Criteria:

  1. Adolescents with medication-induced or type 1 diabetes
  2. are currently being treated with corticosteroids or atypical antipsychotics, as these agents significantly influence carbohydrate metabolism
  3. have an orthopaedic injury or chronic illness that would prevent them from performing the intervention
  4. have experienced >10% weight loss or enrolled in weight loss program within six months of enrolment
  5. a history of alcoholism or drug abuse
  6. require use of medication(s) known to affect insulin sensitivity or secretion within the last 30 days
  7. medication(s) known to cause weight gain
  8. anabolic steroids
  9. weight loss medication(s)
  10. pregnant or planning to be pregnant

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Overweight Adolescents Performing Resistance Training
Overweight adolescents that meet pre-specified enrollment criteria will all undergo supervised resistance exercise for a 6-week period. Prior to training, all participants will undergo a single bout of resistance training to determine the acute release of Irisin with resistance training. This will be the primary exposure variable. After the acute session, all participants will perform resistance training three times per week for a period of 4 weeks. During each session participants will perform 3 sets of 8-12 repetitions (60-85% of 1RM) for major muscle groups (quadriceps, shoulders, and pectoral).
Andet: Acute release of irisin after a single exercise session.
We will determine the amount of Irisin secreted after a single bout of resistance exercise. Participants will be stratified into 3 groups based on the degree of Irisin release during this acute bout of resistance exercise. The metabolic adaptations to the 4 weeks of resistance training will be compared between youth stratified according to the amount of Irisin released during the acute bout of resistance exercise.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Hepatic Triglyceride Content
Tidsramme: 6 weeks
Hepatic triglyceride content will be measured by using 1H magnetic resonance spectroscopy. After image acquisition, a single voxel volume of interest will be placed in the upper right lobe of the liver in an area devoid of adipose tissue to acquire 1H spectra. A total of 64 spectra will be collected and averaged to determine the intracellular triglyceride content.
6 weeks

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Post-prandial glucose
Tidsramme: 6 weeks
Glucose area under the curve (AUC) will be determined by summing the area under serum glucose measures between each 15- or 30-min segment using the trapezium rule during a frequently sampled 75-g oral glucose challenge .
6 weeks

Samarbejdspartnere og efterforskere

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

Sponsor

University of Manitoba

Efterforskere

  • Ledende efterforsker: Jon M McGavock, PhD, University of Manitoba

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

1. juli 2014

Primær færdiggørelse (Faktiske)

1. oktober 2015

Studieafslutning (Faktiske)

1. oktober 2015

Datoer for studieregistrering

Først indsendt

28. juli 2014

Først indsendt, der opfyldte QC-kriterier

29. juli 2014

Først opslået (Skøn)

30. juli 2014

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

31. marts 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

29. marts 2016

Sidst verificeret

1. marts 2016

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Andre undersøgelses-id-numre

  • B2014:064

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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Sponsor / samarbejdspartnere

Placeringer

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