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

23. november 2016 oppdatert av: 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.

Studieoversikt

Status

Fullført

Forhold

Intervensjon / Behandling

Studietype

Intervensjonell

Registrering (Faktiske)

30

Fase

  • Ikke aktuelt

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

18 år til 40 år (Voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

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

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Primært formål: Grunnvitenskap
  • Tildeling: Randomisert
  • Intervensjonsmodell: Crossover-oppdrag
  • Masking: Ingen (Open Label)

Våpen og intervensjoner

Deltakergruppe / Arm
Intervensjon / Behandling
Eksperimentell: 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
Atferdsmessig: High intensity exercise
3x30 seconds 'all out' sprints
Sham-komparator: Lay down comfortably
As a control conditions, subjects wil lay down comfortably and rest
Atferdsmessig: Lay down comfortably
rest

Hva måler studien?

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
Tiltaksbeskrivelse
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
Tiltaksbeskrivelse
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

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

Radboud University Medical Center

Samarbeidspartnere

European Foundation for the Study of Diabetes
Dutch Diabetes Research Foundation

Etterforskere

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

Publikasjoner og nyttige lenker

Den som er ansvarlig for å legge inn informasjon om studien leverer frivillig disse publikasjonene. Disse kan handle om alt relatert til studiet.

Generelle publikasjoner

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart

1. januar 2015

Primær fullføring (Faktiske)

1. mai 2016

Studiet fullført (Faktiske)

1. juli 2016

Datoer for studieregistrering

Først innsendt

14. november 2014

Først innsendt som oppfylte QC-kriteriene

3. desember 2014

Først lagt ut (Anslag)

4. desember 2014

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

25. november 2016

Siste oppdatering sendt inn som oppfylte QC-kriteriene

23. november 2016

Sist bekreftet

1. april 2016

Mer informasjon

Begreper knyttet til denne studien

Nøkkelord

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • End_lac_sympt

Denne informasjonen ble hentet direkte fra nettstedet clinicaltrials.gov uten noen endringer. Hvis du har noen forespørsler om å endre, fjerne eller oppdatere studiedetaljene dine, vennligst kontakt register@clinicaltrials.gov. Så snart en endring er implementert på clinicaltrials.gov, vil denne også bli oppdatert automatisk på nettstedet vårt. .

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