Impact of Exenatide on Cardiovascular Exercise Performance in Type 2 Diabetes
| Status: | Completed |
|---|---|
| Conditions: | Diabetes |
| Therapuetic Areas: | Endocrinology |
| Healthy: | No |
| Age Range: | 45 - 70 |
| Updated: | 8/17/2018 |
| Start Date: | October 2010 |
| End Date: | December 2014 |
Previous research in our lab and others has established that type 2 diabetes (T2D) is
associated with significantly impaired functional exercise capacity, a factor which is
potentially associated with an increased risk of cardiovascular disease in those with type 2
diabetes. Of great concern, the majority of people with type 2 diabetes are sedentary and one
possible reason may be that exercise, even at low levels, is perceived as being a harder
effort than for nondiabetic people. Thus, treatments that may motivate patients with type 2
diabetes to be more physically active have great potential benefit.
Recent observational studies suggest that glucagon-like peptide-1 agents, such as exenatide,
may have a beneficial effect on endothelial and cardiac function. Because these two factors
have been shown to be associated with exercise dysfunction in type 2 diabetes, the
investigators hypothesize that exenatide may improve exercise capacity in those with type 2
diabetes. The aims of this study are to (1) assess whether exenatide will improve functional
exercise capacity in persons with type 2 diabetes and (2) investigate the effect of exenatide
on specific metabolic, endothelial, cardiac and peripheral circulatory measures of function
related to changes in exercise capacity. The Investigators primary hypothesis is that
exenatide will improve functional exercise capacity in people with type 2 diabetes. Having a
drug that improves exercise capacity could motivate patients to exercise more and hence be a
significant benefit.
associated with significantly impaired functional exercise capacity, a factor which is
potentially associated with an increased risk of cardiovascular disease in those with type 2
diabetes. Of great concern, the majority of people with type 2 diabetes are sedentary and one
possible reason may be that exercise, even at low levels, is perceived as being a harder
effort than for nondiabetic people. Thus, treatments that may motivate patients with type 2
diabetes to be more physically active have great potential benefit.
Recent observational studies suggest that glucagon-like peptide-1 agents, such as exenatide,
may have a beneficial effect on endothelial and cardiac function. Because these two factors
have been shown to be associated with exercise dysfunction in type 2 diabetes, the
investigators hypothesize that exenatide may improve exercise capacity in those with type 2
diabetes. The aims of this study are to (1) assess whether exenatide will improve functional
exercise capacity in persons with type 2 diabetes and (2) investigate the effect of exenatide
on specific metabolic, endothelial, cardiac and peripheral circulatory measures of function
related to changes in exercise capacity. The Investigators primary hypothesis is that
exenatide will improve functional exercise capacity in people with type 2 diabetes. Having a
drug that improves exercise capacity could motivate patients to exercise more and hence be a
significant benefit.
Subjects will come for a total of seven testing visits, including two screening visits,
during which evaluations will take place. Visits are structured as follows:
Visits 1, 2 and 3 will be completed over a four-week period.
1. After subjects review the study and give consent for study participation, a history and
physical exam will be performed. In addition, the Low-level Physical Activity Recall
(LoPAR) questionnaire, pulmonary function testing, and vital signs will be performed.
2. Subjects will be asked to fast prior to visit 2. Blood and urine samples will be
collected for measurement of glycosylated hemoglobin(HbA1C), fasting glucose, fasting
insulin, free fatty acids and microalbuminuria (these measures will be covariates in the
analyses). A dietary survey will be administered for food preferences for the three day
study diet administered prior to visits 3, 4, 6 and 7. Dual Energy X-ray Absorptiometry
(DXA) and body composition tests will be done to ensure that groups are weight similar
(using fat-free mass). Autonomic nervous system testing, a resting electrocardiogram
(EKG) and familiarization bicycle test will be performed.
3. Subjects will receive a three day study diet prior to visit 3. A resting and exercise
EKG will be performed on the day of the visit. Patients will have measures made of
cardiac function and endothelial function on visit 3 as well using plethysmography and
cardiac echo. The peak aerobic capacity (VO2max) test will be performed. Vital signs
will be taken at rest.
4. Randomization: Subjects will receive a three day study diet prior to visit 4. During
visit four, arterial stiffness/endothelial function will be non-invasively measured by
the Sphygmocor system. Subjects will have three constant-load tests to measure oxygen
(VO2) kinetics where oxygen saturation (StO2) will be measured during exercise. A
resting and exercise EKG and vital signs will be performed during the visit. Subjects
will be randomized to either taking exenatide or placebo and all must have been taking
metformin (1-2 grams /d) for at least 3 months. Exenatide will be titrated starting at 5
mcg twice per day for two weeks then moving to 10 mcg twice per day as tolerated and the
placebo dose will match this titration. During the treatment phase subjects will be
given a log to keep track of their blood glucose each day. Study coordinators will
contact each subject weekly to obtain these values which will be checked by the study
doctors and shared with the subject's primary care physician if adjustments in other
medications need to be made.
5. Week 4: Visit 5 will consist of a physical exam with a clinician as well as a blood draw
and check of vital signs during exenatide treatment.
6. Week 12: After 3 months of exenatide or placebo administration, the procedures of Visit
3 will be repeated as Visit 6. Additional testing to be performed during visit 6 include
a physical exam performed by a study physician, DXA scan and body composition tests to
monitor any changes in body composition (fat-free mass), blood work for lab tests listed
in Visit 2 and the LoPAR questionnaire.
7. Week 13: During visit 7, the testing performed during visit 4 will be repeated after 3
months of exenatide or placebo administration.
Subjects will continue exenatide or placebo treatment while completing exit testing during
Weeks 12 and 13.
during which evaluations will take place. Visits are structured as follows:
Visits 1, 2 and 3 will be completed over a four-week period.
1. After subjects review the study and give consent for study participation, a history and
physical exam will be performed. In addition, the Low-level Physical Activity Recall
(LoPAR) questionnaire, pulmonary function testing, and vital signs will be performed.
2. Subjects will be asked to fast prior to visit 2. Blood and urine samples will be
collected for measurement of glycosylated hemoglobin(HbA1C), fasting glucose, fasting
insulin, free fatty acids and microalbuminuria (these measures will be covariates in the
analyses). A dietary survey will be administered for food preferences for the three day
study diet administered prior to visits 3, 4, 6 and 7. Dual Energy X-ray Absorptiometry
(DXA) and body composition tests will be done to ensure that groups are weight similar
(using fat-free mass). Autonomic nervous system testing, a resting electrocardiogram
(EKG) and familiarization bicycle test will be performed.
3. Subjects will receive a three day study diet prior to visit 3. A resting and exercise
EKG will be performed on the day of the visit. Patients will have measures made of
cardiac function and endothelial function on visit 3 as well using plethysmography and
cardiac echo. The peak aerobic capacity (VO2max) test will be performed. Vital signs
will be taken at rest.
4. Randomization: Subjects will receive a three day study diet prior to visit 4. During
visit four, arterial stiffness/endothelial function will be non-invasively measured by
the Sphygmocor system. Subjects will have three constant-load tests to measure oxygen
(VO2) kinetics where oxygen saturation (StO2) will be measured during exercise. A
resting and exercise EKG and vital signs will be performed during the visit. Subjects
will be randomized to either taking exenatide or placebo and all must have been taking
metformin (1-2 grams /d) for at least 3 months. Exenatide will be titrated starting at 5
mcg twice per day for two weeks then moving to 10 mcg twice per day as tolerated and the
placebo dose will match this titration. During the treatment phase subjects will be
given a log to keep track of their blood glucose each day. Study coordinators will
contact each subject weekly to obtain these values which will be checked by the study
doctors and shared with the subject's primary care physician if adjustments in other
medications need to be made.
5. Week 4: Visit 5 will consist of a physical exam with a clinician as well as a blood draw
and check of vital signs during exenatide treatment.
6. Week 12: After 3 months of exenatide or placebo administration, the procedures of Visit
3 will be repeated as Visit 6. Additional testing to be performed during visit 6 include
a physical exam performed by a study physician, DXA scan and body composition tests to
monitor any changes in body composition (fat-free mass), blood work for lab tests listed
in Visit 2 and the LoPAR questionnaire.
7. Week 13: During visit 7, the testing performed during visit 4 will be repeated after 3
months of exenatide or placebo administration.
Subjects will continue exenatide or placebo treatment while completing exit testing during
Weeks 12 and 13.
Inclusion Criteria
- Men and women between the ages of 45 and 70 years of age
- Diagnosed with uncomplicated type 2 diabetes
- Sedentary persons (exercising not more than one time per week)
- Females who are post-menopausal
- BMI must be less than 35
- Subjects must be taking metformin for diabetes control and may also be on sulfonylurea
drugs or meglitinides
- Glycosylated hemoglobin (HbA1C) <9%
- Non-smokers or former smokers who have quit for at least 1 year
- Absence of comorbid conditions
- Resting systolic blood pressure < 190, Resting diastolic blood pressure < 95
Exclusion Criteria
- People with type 2 diabetes (T2D) taking oral medications, other than metformin or
sulfonylurea drugs or meglitinides, to control their diabetes.
- Persons treated with insulin will be excluded
- People who are currently smoking or have not quit for at least one year
- Peripheral neuropathy
- Regional wall motion abnormalities
- Left ventricular systolic dysfunction
- Ischemic heart disease (abnormal resting or exercise electrocardiogram)
- Presence of angina that would limit exercise performance
- Pulmonary problems that would limit exercise performance
- Systolic blood pressure >190 mmHg at rest or >250 mmHg with exercise or diastolic
pressure >95 mmHg at rest or >115 mmHg with exercise
- Persons with autonomic dysfunction (>20 mm fall in upright BP without a change in
heart rate)
- Proteinuria (urine protein >200 mg/dl) or a creatinine > 2.0 mg/dl
- Renal disease
- Persons with peripheral arterial disease
- Persons with a history of pancreatitis
We found this trial at
1
site
13001 E 17th Pl
Aurora, Colorado 80045
Aurora, Colorado 80045
(303) 724-5000
University of Colorado Anschutz Medical Campus Located in the Denver metro area near the Rocky...
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