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Pioglitazone Or Exercise to Treat Mild Cognitive Impairment (MCI) (POEM)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00736996
Recruitment Status : Completed
First Posted : August 18, 2008
Results First Posted : January 15, 2016
Last Update Posted : January 15, 2016
National Institute on Aging (NIA)
Information provided by (Responsible Party):
University of Colorado, Denver

Brief Summary:
The purpose of this study is to investigate novel treatments to delay progression to dementia in patients with mild cognitive impairment (MCI) and metabolic syndrome (MS). The hypothesis is that treatment with pioglitazone or endurance exercise training will improve, stabilize, or attenuate decline in cognitive function compared to controls. This study will also discover potential mechanisms for the improvements and determine the baseline prevalence of amnestic versus non-amnestic MCI.

Condition or disease Intervention/treatment Phase
Mild Cognitive Impairment Drug: Pioglitazone Drug: Placebo Behavioral: Endurance Exercise Training Phase 2

Detailed Description:

The Metabolic Syndrome (MS) is a rapidly growing public health problem. This constellation of metabolic abnormalities increases the risk of diabetes, heart disease and death. Recently evidence has linked MS with cognitive impairment and dementia, including Alzheimer's Disease (AD). AD is preceded by a state called Mild Cognitive Impairment (MCI), characterized by subjective and objective memory impairment, but no functional impairment. Although not all persons with MCI will develop AD, the conversion rate from MCI to AD is about 15% per year, or 5-10 times that of cognitively normal individuals. There is great interest in finding treatments to prevent AD by intervening at an earlier stage, i.e. MCI.

The mechanism(s) linking MS and cognitive impairment are not clear, although there is evidence that insulin resistance and inflammation play key roles. Thiazolidinediones (TZDs) are medications approved for the treatment of Type 2 Diabetes, which work by reducing insulin resistance. In addition, these drugs have anti-inflammatory properties. A recent pilot study showed improvements in some areas of cognition in patients with MCI or mild AD treated with the TZD rosiglitazone. Endurance exercise training (EET) is an established treatment for MS and insulin resistance. There is also evidence that EET may improve cognitive function as well.

Adults aged 55 years or older with both MS and MCI at baseline will be randomized to a 6-month intervention with either (1) treatment with pioglitazone, (2) endurance exercise training, or (3) control (placebo and no exercise). The hypothesis is that treatment with the TZD pioglitazone or EET will improve cognitive function compared to controls, as evidenced by either improvement, stabilization, or lesser decline in performance on cognitive testing. Participants will undergo a physical exam including blood and urine tests, a complete neurologic exam, and a comprehensive battery of cognitive tests. They will also have a DEXA scan, exercise treadmill test, non-invasive tests of vascular function and a hyperglycemic-euglycemic clamp procedure to measure insulin resistance.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 78 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Pioglitazone and Exercise Effects on Older Adults With MCI and Metabolic Syndrome
Study Start Date : November 2008
Actual Primary Completion Date : December 2013
Actual Study Completion Date : December 2013

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Pioglitazone


30 - 45mg tablet daily for 6 months

Drug: Pioglitazone
30 - 45mg tablet daily for 6 months
Other Name: Actos

Active Comparator: Endurance Exercise Training
Endurance Exercise Training (EET) Individualized exercise prescription, 45-75 minutes (progressive increments) three times a week
Behavioral: Endurance Exercise Training
Individualized exercise prescription, 45-75 minutes (progressive increments) three times a week

Placebo Comparator: Placebo
Placebo matching tablet sugar pill daily for 6 months
Drug: Placebo
Matching tablet daily for 6 months

Primary Outcome Measures :
  1. Change in Cognitive Performance [ Time Frame: Baseline to 6 months ]
    Participants were administered a neuropsychological testing battery consisting of assessments in four cognitive domains: memory (Visual Reproduction II, Logical Memory II, Rey Auditory Verbal Learning Test), language (Boston Naming Test , Category Fluency), visuospatial (Block Design, Picture Completion), and executive function (Trail Making Test B, Digit Symbol Test). Raw test scores for these primary cognitive domain measures were transformed into age-adjusted scaled scores with a mean of 10 and a standard deviation (SD) of 3, with higher numbers indicating better cognitive performance, using the Mayo's Older American Normative Studies data. Cognitive domain scores were calculated as the arithmetic mean of the normatively derived scaled scores for all of the tests in that domain.

Secondary Outcome Measures :
  1. Change in Insulin Resistance [ Time Frame: Baseline to 6 months ]
    Change in whole body glucose disposal rate (mg/kg/min) calculated during a single-stage (40 mU/m2/min), 3-hour hyperinsulinemic, euglycemic clamp

  2. Change in Peak Oxygen Uptake (VO2 Peak) [ Time Frame: Baseline to 6 months ]
    Peak oxygen consumption (VO2 peak, ml/kg/min) was determined by open circuit spirometry during a standard treadmill stress test (modified Balke protocol).

Information from the National Library of Medicine

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Ages Eligible for Study:   55 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Community-dwelling, over 55 years old, able to give full informed consent, willing to be randomized
  • Able to perform a telephone interview
  • Able to speak, read and understand English
  • Potential volunteers on a statin drug, angiotensin converting enzyme inhibitor (ACE-I), angiotensin II receptor blocker (ARB), non-steroidal anti-inflammatory drug (NSAID), or Vitamin E supplement, are eligible but must be on a stable dose for at least 2 months
  • Women must be post-menopausal, as defined by no menses for 12 months
  • Must meet 3 of the 5 requirements for Metabolic Syndrome:

    • Waist measurement: greater than 102 cm for men and 88 cm for women
    • Fasting hypertriglyceridemia: 150 mg/dl (1.7 mmol/L) or higher
    • Low HDL cholesterol: less than 40 mg/dl (1.0 mmol/L) for men and 50 mg/dl (1.3 mmol/L) for women
    • Hypertension: higher than 130 mmHg systolic or 85 mmHg diastolic (average of 2 seated measurements) or currently using an antihypertensive medication
    • Elevated (untreated) fasting glucose: 100 mg/dl (5.6 mmol/L) or higher
  • Meet the study's 4-step screening process for MCI (to rule out dementia)

Exclusion Criteria:

  • Diagnosis of diabetes mellitus (DM), defined as: Fasting Blood Sugar 126 or higher, a history of known DM, or treatment with any glucose lowering medication
  • Current diagnosis of dementia (or MMSE less than 24) or a neurological co-morbidity other than MCI that might affect cognition including: large vessel stroke, brain tumor, severe brain injury, multiple sclerosis, or Parkinson's disease
  • Current diagnosis of depression assessed by a Centers for Epidemiologic Studies Depression Scale (CES-D) score of 36 or less
  • Major psychiatric conditions such as bipolar disorder, psychosis, schizophrenia, or alcoholism that could affect the ability to understand and/or cooperate fully with the protocol
  • Significant cerebral vascular disease
  • Modified Hachinski score greater than 4
  • Pregnant, lactating or having child bearing potential
  • Concomitant medications with significant cholinergic or anticholinergic effects or adverse effects on cognition including: antipsychotics, tricyclic antidepressants, anticonvulsants, sedative/hypnotics, anxiolytics, glucocorticoids (chronic or frequent intermittent), gingko biloba, NMDA receptor antagonists, cholinesterase inhibitors, strongly lipid soluble beta blockers (e.g., propranolol)
  • Hormone replacement therapy (male or female)
  • Visual/hearing impairment that would significantly impact the ability to undergo psychometric testing
  • Significant medical illness or organ failure including hepatic or renal failure, unstable cardiac disease, or life expectancy less than 18 months
  • Exercise-limiting conditions including: neuromuscular, joint/bone, cardiovascular, peripheral vascular, cerebrovascular or pulmonary disease; recent MI, pulmonary embolus, significant aortic stenosis; or exercise limiting obesity
  • Untreated B12 deficiency or hypothyroidism (stable treatment for at least 3 months is allowable)
  • Uncontrolled hypertension: over 160 mmHg systolic or 100 mmHg diastolic (stable treatment is allowable)
  • Endurance exercise training more than twice a week for 20 minutes (at a level that produces sweating) consistently during the last 6 months
  • Unstable weight in the last 6 months
  • Increased risk for Pio toxicity including: a) baseline liver dysfunction (over 2.5xULN for AST, ALT); b) hematocrit less than 33% men or 30% women; c) problematic edema; or d) congestive heart failure NYHA class II or greater
  • Stage 5 renal impairment (GFR less than 15 or dialysis)
  • Already taking a TZD or other drug that would modify insulin resistance (e.g. metformin), or has taken a TZD in the past and experienced a significant adverse effect or allergy
  • Currently taking any of following medications that may interact with Pio metabolism: atorvastatin at 80mg/day (lower doses are allowed), and medications with major CYP 3A4 inhibiting effects, such as nefazodone or systemic antifungal agents
  • Participating in another clinical trial

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00736996

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United States, Colorado
University of Colorado, Denver
Denver, Colorado, United States, 80045
Sponsors and Collaborators
University of Colorado, Denver
National Institute on Aging (NIA)
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Principal Investigator: Robert S. Schwartz, MD University of Colorado, Denver
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Responsible Party: University of Colorado, Denver
ClinicalTrials.gov Identifier: NCT00736996    
Other Study ID Numbers: 07-1215
R01AG028746 ( U.S. NIH Grant/Contract )
First Posted: August 18, 2008    Key Record Dates
Results First Posted: January 15, 2016
Last Update Posted: January 15, 2016
Last Verified: December 2015
Keywords provided by University of Colorado, Denver:
Metabolic Syndrome
Mild Cognitive Impairment
Insulin Resistance
Endurance Exercise
Additional relevant MeSH terms:
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Cognitive Dysfunction
Cognition Disorders
Neurocognitive Disorders
Mental Disorders
Hypoglycemic Agents
Physiological Effects of Drugs