High-Intensity Exercise and Endothelial Function in Type 1 Diabetes(HIIT-T1D) (HIIT-T1D)

March 1, 2018 updated by: Hospital de Clinicas de Porto Alegre

Effect of High-Intensity Interval Exercise Training Compared With Moderate-intensity Continuous Training on Endothelial Function and Cardiorespiratory Fitness of Type 1 Diabetes Patients

To study the effect of 8 week high-intensity interval training (HIIT) compared with moderate intensity (MCT) interval training and sedentary patients(CON) with type 1 diabetes. Adult T1DM patients without known complications are randomised in blocks into these 3 groups according to their baseline flow mediated dilation (FMD). After 8 week exercise training, the main outcome, FMD, is re-evaluated. Additional variables such as VO2 peak for cardiovascular fitness, oxidative stress and endothelial independent vasodilation to study vascular rigidity are also evaluated.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

In a randomized controlled open trial, 36 adult type 1 diabetes mellitus (T1DM) patients without known complications were randomized into 3 groups: HIIT n=12; MCT n=12 and a sedentary control group (CON) n=12. Total sample size was calculated to a power of 80% alha 0.05 and a difference in mean FMD of 2%. Before randomisation, flow mediated dilation (FMD) and maximal exercise capacity (VO2 peak)is determined. Block Randomisation based on FMD rank values are done to equalize baseline FMD. Exercise sessions are performed in cycle ergometers during 40 minutes, 3 times a week, along 8 weeks. HIIT protocol, intensity vary from 50 to 85% of the maximum heart rate (HRmax), while in MCT, HR remained stable at 50% HRmax. Endothelial function was measured by flow mediated dilation (FMD) for endothelium-dependent vasodilation (EDVD) and smooth-muscle function was measured by nitroglycerine mediated dilation (endothelium independent vascular dilation) - (EIVD). Peak oxygen consumption (VO2peak) and oxidative stress markers were determined before and after the training period. ED was defined as an increase of less than 8% in vascular diameter after cuff release.

Study Type

Interventional

Enrollment (Actual)

36

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Brazil
    • RS
      • Porto Alegre, RS, Brazil, 90035-0033
        • Serviço de Endocrinologia e Metabologia do HCPA

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 40 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

T1DM

  • Physically inactive or not involved in exercise training programs in the previous 6 months
  • Interested in starting an exercise training program.

Exclusion Criteria:

  • Smokers,
  • Pregnancy
  • Co-morbidities not related to diabetes
  • Drugs other than insulin
  • Loss of renal function (serum creatinine above 1.5 mg/dl),
  • Moderate to severe retinopathy or blindness,
  • Suspected or confirmed coronary artery disease,
  • Severe peripheral neuropathy
  • Foot ulcers or history of previous foot ulcer
  • Suspected or confirmed clinical autonomic neuropathy.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: High Intensity Interval Training
High Intensity Interval Exercise Training in cycle ergometer 3 times a week for 8 weeks
Behavioral: High Intensity Interval Training
High Intensity Interval Exercise Training in cycle ergometer, exercising at 80% of maximal capacity during one minute alternated with exercise at 50% of maximal capacity during 4 minutes intervals, for a total of 30 minutes. Three times a week for 8 weeks
Active Comparator: Moderate Continuous Exercise Training
Moderate Continuous Interval Training
Behavioral: Moderate Continuous Exercise Training
Moderate Continuous Exercise Training 3 times a week for 8 weeks at 50% of maximal capacity
Other: Non-exercise
Sedentary Type 1 Diabetes Controls.
Other: Non-exercise
Conventional care for sedentary Type 1 Diabetes Controls. No intervention.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Endothelial Dependent Mediated Vascular Dilation
Time Frame: 8 weeks
Percent of change from baseline in flow mediated dilation measured through arterial ultrasound at right arm
8 weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Peak oxygen consumption
Time Frame: 8 weeks
Percent of change in maximal oxygen capacity measured by in maximal oxygen consumption
8 weeks
Endothelial independent vascular dilation
Time Frame: 8 weeks
Percent of change from baseline in nitrate mediated dilation measured through arterial ultrasound at right arm
8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Hospital de Clinicas de Porto Alegre

Investigators

  • Principal Investigator: Marcello C Bertoluci, MD, PhD, Hospital de Clínicas de Porto Alegre

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 1, 2015

Primary Completion (Actual)

January 1, 2016

Study Completion (Actual)

January 1, 2017

Study Registration Dates

First Submitted

February 23, 2018

First Submitted That Met QC Criteria

February 23, 2018

First Posted (Actual)

March 1, 2018

Study Record Updates

Last Update Posted (Actual)

March 5, 2018

Last Update Submitted That Met QC Criteria

March 1, 2018

Last Verified

March 1, 2018

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 150564

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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