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Sponsored by: |
Ottawa Health Research Institute |
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Information provided by: | Ottawa Health Research Institute |
ClinicalTrials.gov Identifier: | NCT00148538 |
This is a randomized controlled trial evaluating different exercise modalities in previously inactive subjects with type 1 diabetes.
The primary objective of this study is to determine the effects of resistance exercise training, and of aerobic exercise training, on glycemic control (A1c) in previously inactive individuals with type 1 diabetes, with background therapy meeting modern standards, including multiple daily insulin injections or insulin pump, carbohydrate counting, frequent glucose monitoring, and utilization of glucose monitoring to adjust CHO and insulin for exercise.
Secondary aims: In type 1 diabetic individuals receiving therapy meeting the criteria above, to determine the effects of resistance exercise training and aerobic exercise training on frequency of hypoglycemia, body composition, lipids, C-reactive protein and quality of life.
Hypotheses:
Secondary hypotheses: We expect that both aerobic and resistance exercise will show trends to improvement in most listed secondary outcomes.
Condition | Intervention | Phase |
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Diabetes Mellitus, Type 1 |
Behavioral: Resistance and/or Aerobic Exercise |
Phase II Phase III |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Single Blind (Subject), Active Control, Factorial Assignment, Efficacy Study |
Official Title: | Type 1 Diabetes Aerobic and Resistance Exercise (T1-DARE) |
Estimated Enrollment: | 36 |
Study Start Date: | July 2005 |
Estimated Study Completion Date: | March 2008 |
Estimated Primary Completion Date: | March 2008 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Active Comparator
exercise
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Behavioral: Resistance and/or Aerobic Exercise
Resistance and/or Aerobic Exercise
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Background: Type 1 diabetes is characterized by complete or near-complete absence of insulin secretion, generally due to autoimmune disease. Cardiovascular disease (CVD) risk in type 1 diabetes is just as great as in type 2 diabetic individuals of the same age, even though type 1 diabetic individuals usually have fewer additional CVD risk factors. This is likely due to earlier age of onset of diabetes and therefore much longer exposure to hyperglycemia. The incidence of type 1 diabetes is increasing throughout the world. The reasons for this are thought to be environmental although the exact nature of the environmental precipitants is not well understood. In contrast to type 2 diabetes, in which it is clear that aerobic exercise improves glycemic control, studies in type 1 diabetes have generally not found a significant beneficial effect for aerobic exercise on glycemic control, even though there is often reduction in insulin requirements and improved insulin sensitivity. This paradoxical finding may be because individuals with type 1 diabetes are at much higher risk of hypoglycaemia than type 2 and tend to increase their carbohydrate intake in an effort to avoid exercise-induced drops in glucose.
The acute effects of resistance exercise on glycemia in type 1 diabetes have not been established; it is possible that resistance exercise results in a smoother or more predictable decline in blood glucose than aerobic training does, which might reduce fear of hypoglycemia and consequent overcompensation. Resistance exercise training increases insulin receptor protein expression, which is not true of aerobic exercise training .
Study Design: This will be a randomized, controlled trial with a 2 by 2 factorial design (resistance training versus no resistance training; aerobic training versus no aerobic training) in previously inactive subjects with type 1 diabetes. After screening, qualifying subjects will enter a 5-week stabilization/run in period prior to randomization. During this period their diet and insulin therapy will be assessed and optimized, and in weeks 2-5 they will also undergo three supervised sessions of low-intensity exercise per week. Those demonstrating adequate compliance during the run-in period will then be randomized in equal numbers to Aerobic Training (A) progressing to 45 min 3X/wk at 75% of maximum heart rate, Resistance Training (R) 3X/week progressing to 3 sets, 8 repetitions of 8 exercises at the maximum load that can be lifted 8 times (8RM), both Aerobic Training and Resistance Training (AR) or waiting-list control (C). The exercise intervention will take place at YMCAs in metropolitan Ottawa. Subjects cannot be blinded as to group assignment after randomization, but the main study outcomes will be measured by blinded individuals (lab technologists) using objective methods. Subjects randomized to waiting list control will begin a program of their choice (A, R or AR) after all 6-month outcome measures are collected.
Significance: This study addresses questions of clinical and scientific importance. It will help clarify the benefits and risks of aerobic and resistance exercise training in people with type 1 diabetes. Depending on the strength of any differences found, the study will either stand alone or provide pilot data that will set the stage for a larger definitive study. Even if results are substantially different from our expectations, this study will provide valuable new information on the effects of different exercise modalities on metabolic control, body composition, cardiovascular risk factors, and quality of life in this high-risk population.
Ages Eligible for Study: | 16 Years and older |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
Exclusion Criteria:
Contact: Penny A Phillips, BSc, MA | 613-738-8400 ext 81959 | pphillips@ohri.ca |
Canada, Ontario | |
Ottawa Health Research Institute | Recruiting |
Ottawa, Ontario, Canada, K1Y 4E9 | |
Contact: Penny A Phillips, B.Sc. MA 613-738-8400 ext 81959 pphillips@ohri.ca |
Principal Investigator: | Ronald J Sigal | The Ottawa Health Research Institute, The Ottawa Hospital, The University of Ottawa |
Principal Investigator: | Gary Goldfield | Childrens Hospital of Eastern Ontario |
Principal Investigator: | Glen Kenny | University of Ottawa |
Principal Investigator: | Stasia Hadjiyannakis | Children's Hospital of Eastern Ontario |
Responsible Party: | OHRI ( Dr. R. Sigal ) |
Study ID Numbers: | GA-3-05-1903-RS |
Study First Received: | September 6, 2005 |
Last Updated: | November 19, 2008 |
ClinicalTrials.gov Identifier: | NCT00148538 |
Health Authority: | Canada: Health Canada |
Type 1 Diabetes Resistance Exercise Aerobic Exercise |
Exercise & Disease Exercise Diabetes |
Autoimmune Diseases Metabolic Diseases Diabetes Mellitus, Type 1 Diabetes Mellitus |
Endocrine System Diseases Endocrinopathy Metabolic disorder Glucose Metabolism Disorders |
Immune System Diseases |