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The Role of Endogenous Lactate in Brain Preservation and Counterregulatory Defenses Against Hypoglycemia

23. november 2016 opdateret af: Radboud University Medical Center

The Effect of Exercise-induced Hyperlacticacidemia on Counterregulatory Responses, Symptoms, Cognitive Function and Brain Lactate Accumulation During Hypoglycemia in (Hypoglycemic Unaware)Type I Diabetes Patients and Normal Controls

Iatrogenic hypoglycemia is the most frequent acute complication of insulin therapy in people with type 1 diabetes (T1DM). Recurrent hypoglycemic events initiate a process of habituation, characterized by suppression of hypoglycemic symptoms, eventually leading to hypoglycemia unawareness, which creates a particularly high risk of severe hypoglycemia. Recent evidence suggest a pivotal role for (brain) lactate in the pathogenesis of hypoglycemia unawareness. Indeed, exogenous lactate administration may preserve brain function and attenuate counterregulatory responses to and symptomatic awareness of hypoglycemia. It is unknown whether endogenous elevation of plasma lactate produces the same effects and whether such effects differ between patients with T1DM with and without hypoglycemia unawareness and healthy controls.

Objective: To investigate the effect of elevated levels of endogenous lactate on brain lactate accumulation and on counterregulatory responses to, symptomatic awareness of and cognitive function during hypoglycemia in patients with T1DM with and without hypoglycemia unawareness and normal controls.

Hypothesis: The investigators hypothesize first that endogenous lactate, when raised through high intensity exercise, preserves neuronal metabolism during subsequent hypoglycemia, which in turn will attenuate counterregulatory hormone responses, appearance of symptoms and deterioration of cognitive function. Second, the investigators posit that these effects will be augmented in patients with hypoglycemia unawareness compared to healthy subjects and T1DM patients with normal awareness as a consequence of greater transport capacity of lactate into the brain.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

30

Fase

  • Ikke anvendelig

Kontakter og lokationer

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

Studiesteder

  • Holland
      • Nijmegen, Holland
        • Radboud UMC

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 40 år (Voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion criteria for healthy subjects

  • Age: 18-40 years
  • Body-Mass Index: 18-30 kg/m2
  • Blood pressure: <160/90 mmHg
  • Recreationally active: i.e. taking part in competitive sport or regular exercise training, of a non-professional nature, once or more a week.

Inclusion criteria T1DM patients with normal hypoglycemic awareness

  • Diabetes duration ≥ 1 year
  • Age: 18-40 years
  • Body-Mass Index: 18-30 kg/m2
  • HbA1c: 42-75 mmol/mol (6-9%)
  • Outcome Clarke questionnaire: 0-1
  • Blood pressure: <160/90 mmHg
  • Recreationally active: i.e. taking part in competitive sport or regular exercise training, of a non-professional nature, once or more a week

Inclusion criteria T1DM patients with hypoglycemia unawareness

  • Diabetes duration ≥ 1 year
  • Age: 18-40 years
  • Body-Mass Index: 18-30 kg/m2
  • HbA1c: 42-75 mmol/mol (6-9%)
  • Outcome Clarke questionnaire: =>3
  • Blood pressure: <160/90 mmHg
  • Recreationally active

Exclusion criteria:

  • Inability to provide informed consent
  • Presence of any medical condition that might interfere with the study protocol, such as brain injuries, epilepsy, a major cardiovascular disease event or anxiety disorders
  • Use of any medication, except for oral contraceptives
  • MR(I) contraindications (pregnancy, severe claustrophobia, metal parts in body)
  • Orthopedic and/or neurological diseases that impair exercise
  • Cardiopulmonary disease as stated in the 2001 American heart association and 2002 American college of cardiology/American heart association guidelines

Additional exclusion criteria for all T1DM patients:

  • Use of any other medication than insulin, except for oral contraceptives or stable thyroxine supplementation therapy
  • complications of T1DM, including proliferative retinopathy, neuropathy or nephropathy

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Grundvidenskab
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: High intensity exercise
Subjects will preform a high intensity training exercise (3* 30 seconds all out sprint on a cycle ergometer) to raise plasma lactate levels
Adfærdsmæssigt: High intensity exercise
3x30 seconds 'all out' sprints
Sham-komparator: Lay down comfortably
As a control conditions, subjects wil lay down comfortably and rest
Adfærdsmæssigt: Lay down comfortably
rest

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Plasma level of adrenaline in response to hypoglycemia (Adrenaline, measured in arterial plasma)
Tidsramme: during 60 m of hypoglycemia
during 60 m of hypoglycemia

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Plasma levels of other counter-regulatory hormones (Levels of counter-regulatory hormones measured in arterial plasma)
Tidsramme: During 60 min hypoglycemia
Levels of counter-regulatory hormones measured in arterial plasma
During 60 min hypoglycemia
Glucose infusion rate (Amount of glucose 20% necessary to maintain plasma glucose at steady state values)
Tidsramme: During 60 min hypoglycemia
Amount of glucose 20% necessary to maintain plasma glucose at steady state values
During 60 min hypoglycemia
Plasma lactate levels (Lactate levels measured in arterial plasma)
Tidsramme: During 60 min hypoglycemia
Lactate levels measured in arterial plasma
During 60 min hypoglycemia
Cognitive functioning, as measured by cognitive tests
Tidsramme: During 60 min hypoglycemia
Cognitive test will be: Dutch State Trait Anxiety Inventory, Digit Span, Stroop color word test, word fluency test, trail making test and Pasat
During 60 min hypoglycemia
Plasma levels of inflammatory markers (levels of cytokines)
Tidsramme: During 60 min hypoglycemia
levels of cytokines
During 60 min hypoglycemia
Brain perfusion measured with ASL-MRI
Tidsramme: During 60 min hypoglycemia
Brain perfusion measured with ASL-MRI
During 60 min hypoglycemia
Brain lactate accumulation measured with 1H-MRS
Tidsramme: During 60 min of hypoglycemia
Brain lactate levels measured with 1H-MRS
During 60 min of hypoglycemia

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Plasma glucose concentration
Tidsramme: During 60 min hypoglycemia
Plasma glucose concentration, necessary to adjust glucose infusion rate
During 60 min hypoglycemia
Plasma insulin concentration (Insulin levels, measured in arterial plasma)
Tidsramme: During 60 min hypoglycemia
Insulin levels, measured in arterial plasma
During 60 min hypoglycemia

Samarbejdspartnere og efterforskere

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

Sponsor

Radboud University Medical Center

Samarbejdspartnere

European Foundation for the Study of Diabetes
Dutch Diabetes Research Foundation

Efterforskere

  • Ledende efterforsker: Bastiaan de Galan, Dr., Radboud University Medical Center

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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. januar 2015

Primær færdiggørelse (Faktiske)

1. maj 2016

Studieafslutning (Faktiske)

1. juli 2016

Datoer for studieregistrering

Først indsendt

14. november 2014

Først indsendt, der opfyldte QC-kriterier

3. december 2014

Først opslået (Skøn)

4. december 2014

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

25. november 2016

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

23. november 2016

Sidst verificeret

1. april 2016

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • End_lac_sympt

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 .

Kliniske forsøg med Type 1 diabetes mellitus

Kliniske forsøg med High intensity exercise

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