Improving Insulin Sensitivity by Non-invasive Brain Stimulation in Persons With Insulin Resistance

NCT ID: NCT04052399

Last Updated: 2020-05-14

Basic Information

• Recruitment Status: UNKNOWN
• Clinical Phase: NA
• Total Enrollment: 20 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2019-11-04
• Study Completion Date: 2021-12-31

Brief Summary

Efforts in curing and preventing obesity and type 2 diabetes (T2D) have been elusive thus far. One reason for that is the lack of understanding of the role of the brain in the development and treatment of the disease. Insulin action in the brain is appreciated to play a vital role in the pathophysiology of T2D, influencing eating behavior, cognition and peripheral metabolism. Whether brain insulin resistance is a cause or consequence of prediabetes is not yet fully understood. Hence, in this project the investigators want to develop a novel tool to treat and prevent type 2 diabetes and to delineate brain mechanisms of insulin resistance in humans. For this purpose, transcranial direct current stimulation (tDCS) will be implemented, which is a powerful tool to stimulate brain networks. In recent studies, it was shown that the hypothalamus is part of a brain network including higher cognitive regions that is particularly vulnerable to insulin resistance. Furthermore, the central insulin response in this network predicted food craving and hunger. The investigators hypothesize that stimulating the hypothalamus-cognitive network will enhance insulin sensitivity and reduce food intake, food craving and hunger. Furthermore, the project will provide the unique opportunity to investigate novel mechanisms of insulin resistance in participants who have been extensively metabolically characterized.

Detailed Description

Objectives The overarching aim of the study is to stimulate the hypothalamus-cognitive brain network to improve insulin sensitivity and eating behavior.

Specific Objectives- Feasibility study:

1. Implement resting-state functional magnetic resonance imaging to identify individual medial and lateral hypothalamic cognitive functional networks.

2. Evaluate and test different non-invasive brain stimulation paradigms by tDCS to stimulate lateral and medial hypothalamus cognitive network on eating behavior and metabolism.

20 participants with overweight and obesity will receive five different tDCS stimulation protocols on five separate days (separated by one week) in a single-blind cluster-randomized order to reduce sequence effects. Optimal stimulation sites are assessed of the lateral and medial hypothalamus-cognitive network based on a modelling approach. Since this is the first study to stimulate the hypothalamus-cognitive network, excitatory as well as inhibitory stimulation is used. To reduce the number of conditions, participant are randomized based on the three main conditions: sham stimulation, anodal and cathodal stimulation. Medial hypothalamus-cognitive network versus lateral hypothalamus-cognitive network stimulation are pseudo-randomised.

Participants will come in the morning, after an overnight fast, to receive a 20 min non-invasive brain stimulation, using tDCS. During the stimulation, participants will perform a stop-signal task on an tablet.

Subsequently, participants will receive a breakfast buffet. The caloric intake from fat, carbohydrates and protein will be documented. Subjective feeling of hunger and food craving will be assessed using a visual analogue scale before stimulation, directly after stimulation and after breakfast. Food pictures will be rated on a laptop for taste and healthiness.

Conditions

Insulin Resistance; Transcranial Direct Current Stimulation

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: CROSSOVER
• Primary Study Purpose: BASIC_SCIENCE
• Blinding Strategy: SINGLE

Study Groups

Anodal tDCS

Anodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network (2 conditions)

Group Type: ACTIVE_COMPARATOR

anodal transcranial direct current stimulation

Intervention Type: DEVICE

Anodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network.

The total injected current will never go beyond 4 milliamp, which will be split among the different stimulation electrodes.

Cathodal tDCS

Cathodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network (2 conditions)

Group Type: ACTIVE_COMPARATOR

cathodal transcranial direct current stimulation

Intervention Type: DEVICE

Cathodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network.

The total injected current will never go beyond 4 milliamp, which will be split among the different stimulation electrodes.

Sham stimulation

Single blind sham stimulation (ramp-up ramp-down stimulation will be applied for 30 seconds in order to simulate the active condition without any further continuous administration of current)

Group Type: PLACEBO_COMPARATOR

transcranial direct current stimulation

Intervention Type: DEVICE

Single blind sham stimulation (ramp-up ramp-down stimulation will be applied for 30 seconds)

Interventions

anodal transcranial direct current stimulation

Anodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network.

The total injected current will never go beyond 4 milliamp, which will be split among the different stimulation electrodes.

Intervention Type: DEVICE

cathodal transcranial direct current stimulation

Cathodal tDCS of the lateral hypothalamus-cognitive or medial hypothalamus-cognitive network.

The total injected current will never go beyond 4 milliamp, which will be split among the different stimulation electrodes.

Intervention Type: DEVICE

transcranial direct current stimulation

Single blind sham stimulation (ramp-up ramp-down stimulation will be applied for 30 seconds)

Intervention Type: DEVICE

Other Intervention Names

anodal tDCS; cathodal tDCS; tDCS

Eligibility Criteria

Inclusion Criteria

• Body mass index (BMI) between 25.5 and 35 kg/m2
• Age between 20 to 60 years of age
• Criteria for prediabetes:

Fasting plasma glucose (PG) 100 mg/dL (5.6 mmol/L) to 125 mg/dL (6.9 mmol/L) (impaired fasting glucose) OR 2-h PG during 75-g oral glucose tolerance test 140 mg/dL (7.8 mmol/L) to 199 mg/dL (11.0 mmol/L) (impaired glucose tolerance) OR HbA1c 5.7-6.4% (39-47 mmol/mol)

Exclusion Criteria

• Insufficient knowledge of the German language
• Persons who cannot legally give consent
• Pregnancy or lactation
• History of severe mental or somatic disorders including neurological diseases (incl. epileptic seizures)
• Taking psychotropic drugs
• Previous bariatric surgery
• Acute infection within the last 4 weeks
• Hemoglobin values less than 12g/dl for women, less than 14 g/dl for men
• Current participation in a lifestyle intervention study or a pharmaceutical study
• Contradictions to a MRI measurement (e.g. metal implants)

• Minimum Eligible Age: 20 Years
• Maximum Eligible Age: 60 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

German Center for Diabetes Research

OTHER

Sponsor Role: collaborator

University Hospital Tuebingen

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Stephanie Kullmann, PhD

Role: PRINCIPAL_INVESTIGATOR

University Hospital Tübingen

Locations

University Clinic Tübingen

Tübingen, , Germany

Site Status: RECRUITING

Countries

Germany

Central Contacts

Stephanie Kullmann, PhD

Role: CONTACT

stephanie.kullmann@med.uni-tuebingen.de

+49 7071 2987703

Martin Heni, MD

Role: CONTACT

martin.heni@med.uni-tuebingen.de

+49 7071 2982711

Facility Contacts

Stephanie Kullmann, PhD

Role: primary

Other Identifiers

243/2019BO1

Identifier Type: -

Identifier Source: org_study_id