Oral Galactose as a Substrate for Post-Exercise Skeletal Muscle Glycogen Repletion in Individuals With Type 1 Diabetes
This Ph.D. project investigates whether orally ingested galactose can be taken up by skeletal muscle and the heart in response to exercise or hyperinsulinemia, and whether it may serve as a viable nutritional strategy for individuals with type 1 diabetes (T1D).
Although exercise provides significant health benefits for people with T1D, it is often associated with substantial glucose fluctuations and an increased risk of hypoglycemia. Conventional carbohydrate strategies based on glucose may further exacerbate glycemic instability due to the rapid increase in blood glucose levels. In contrast, galactose is metabolized more slowly and may therefore provide a more stable energy source during and after exercise.
Previous research has demonstrated that intravenously administered galactose is taken up by human skeletal muscle, with uptake increasing during exercise, suggesting a mechanism that may be at least partly insulin-independent. Building on these findings, this project aims to determine whether similar uptake occurs when galactose is ingested orally.
This study uses a randomized controlled design and applies non-invasive 18F-FDGal PET imaging to quantify galactose uptake in skeletal muscle and cardiac tissue. The findings may contribute to improving dietary recommendations for individuals with T1D, particularly in relation to maintaining stable blood glucose levels during and after physical activity.
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Descripción detallada
Previous studies using intravenously administered galactose have demonstrated direct uptake by human skeletal muscle, with uptake increasing following exercise. These findings challenge the traditional view that galactose must first be converted to glucose in the liver before utilization by peripheral tissues and suggest that exercise may stimulate galactose uptake through partly insulin-independent mechanisms. However, it remains unknown whether the tissue distribution and uptake kinetics of orally ingested galactose resemble those observed during intravenous administration.
The primary hypothesis is that prior exercise increases skeletal muscle galactose uptake. A secondary hypothesis is that co-ingestion of glucose reduces peripheral galactose uptake, potentially through increased hepatic extraction.
To investigate this, eight healthy participants and eight individuals with T1D will complete two study days in a randomized crossover design. On each study day, participants will perform 30 minutes of unilateral high-intensity leg exercise, with the non-exercised leg serving as an intra-individual control.
Following exercise, participants will ingest either 30 g galactose or 30 g galactose combined with 30 g glucose together with 100 MBq of ¹⁸F-FDGal. A 90-minute dynamic whole-body PET scan will be performed to characterize the tissue distribution and kinetics of ¹⁸F-FDGal, followed by a static brain scan. Tissue-specific time-activity curves will be extracted and, together with serial blood sampling, used for kinetic modeling of galactose uptake in skeletal muscle, liver, heart, and brain. Blood samples will be collected throughout the experiment to characterize systemic metabolic responses.
The unilateral exercise model enables direct within-participant comparison of galactose uptake between exercised and resting skeletal muscle, while the crossover design allows assessment of how glucose co-ingestion affects galactose distribution and uptake.
Tipo de estudio
Inscripción (Estimado)
Fase
- No aplica
Contactos y Ubicaciones
Estudio Contacto
- Nombre: Ole Fuglsang-Jensen, master in sports science
- Número de teléfono: +4527897650
- Correo electrónico: AU664914@uni.au.dk
Ubicaciones de estudio
-
-
-
Aarhus, Dinamarca, 8000
- steno diabetes center Aarhus
-
Contacto:
- Esben Søndergaard, Professor
- Número de teléfono: +45
- Correo electrónico: esbensoe@rm.dk
-
Aarhus, Dinamarca, 8000
- Aarhus Universitet
-
Contacto:
- Ole Fuglsang-Jensen
-
-
Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
- Adulto
- Adulto Mayor
Acepta Voluntarios Saludables
Descripción
Inclusion Criteria:
- Healthy or T1D
- BMI 18,5-30 kg/m2
- Singed informed consent
Exclusion Criteria:
- Clinically significant heart, lung, kidney, liver, endocrine, or malignant disease based on information collected during the initial screening visit as well as blood tests
- Lack of awareness of hypoglycemia episodes
- Blood donation within the last 3 months
- Smoking
- Alcohol or substance abuse
- Participation in other studies involving ionizing radiation within the last 6 months
- Claustrophobia
- Inability to train one leg for one hour
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Prevención
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación cruzada
- Enmascaramiento: Único
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
|
Experimental: Galactose
The patient will orally ingest 30 g of galactose.
|
Participants undergo two experimental conditions in a randomized crossover design.
In one condition, participants ingest 30 g of galactose, whereas in the other condition, they ingest 30 g of galactose combined with 30 g of glucose.
The order of the conditions is randomized across participants.
Otros nombres:
|
|
Comparador activo: Galactose + Glucose
The patient will orally ingest 30 g of galactose and 30 g of glucose.
|
Participants undergo two experimental conditions in a randomized crossover design.
In one condition, participants ingest 30 g of galactose, whereas in the other condition, they ingest 30 g of galactose combined with 30 g of glucose.
The order of the conditions is randomized across participants.
Otros nombres:
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Periodo de tiempo |
|---|---|
|
Skeletal muscle galactose uptake rate (μmol/min/g) measured by 2-(18)F-fluoro-2-deoxy-d-galactose (18F-FDGal)
Periodo de tiempo: Measurement will be made on each of the two study days
|
Measurement will be made on each of the two study days
|
Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
|
Captación hepática de galactosa
Periodo de tiempo: Las mediciones se realizarán en cada uno de los dos días de estudio.
|
Tasa de absorción de galactosa hepática (μmol/min/g) medida por 2-(18)F-fluoro-2-desoxi-d-galactosa (18F-FDGal)
|
Las mediciones se realizarán en cada uno de los dos días de estudio.
|
|
Cerebral galactose Uptake
Periodo de tiempo: Measurement will be made on each of the two study days
|
Galactose uptake in the brain, measured by a 10-minute static PET-CT scan performed after the 90-minute dynamic scan.
|
Measurement will be made on each of the two study days
|
Colaboradores e Investigadores
Patrocinador
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio (Estimado)
Finalización primaria (Estimado)
Finalización del estudio (Estimado)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Actual)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
- Enfermedades del sistema endocrino
- Enfermedades metabólicas
- Enfermedades autoinmunes
- Enfermedades del sistema inmunológico
- Trastornos del metabolismo de la glucosa
- Diabetes mellitus
- Enfermedades Nutricionales y Metabólicas
- Diabetes Mellitus, Tipo 1
- Carbohidratos
- Azúcar
- Hexisos
- Monosacáridos
- Glucosa
- Galactosa
Otros números de identificación del estudio
- 1-10-72-25-26 (Otro identificador: Research Ethics Committee Denmark)
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
Información sobre medicamentos y dispositivos, documentos del estudio
Estudia un producto farmacéutico regulado por la FDA de EE. UU.
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .