Acute Exercise on Brain Insulin Sensitivity

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

16 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-05-11

Study Completion Date

2025-03-25

Brief Summary

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Dementia is a leading cause of death in the United States among aging adults. Brain insulin resistance has emerged as a pathologic factor affecting memory, executive function as well as systemic glucose control. Regular aerobic exercise decreases Alzheimer's Disease (AD) risk, in part, through changes in brain structure and function. However, there is limited data available on how exercise impacts brain insulin resistance in aging. This study will test the effect of acute exercise on brain insulin sensitivity in middle-aged to older adults. The study will also examine cognition and cardiometabolic health in relation to brain insulin sensitivity.

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Detailed Description

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Obesity, hypertension, high blood glucose (e.g. prediabetes/type 2 diabetes), and physical inactivity is thought to worsen brain insulin resistance and reduce cerebral blood flow. This suggests lifestyle approaches may be necessary to counteract declines in brain health. Regular aerobic exercise decreases Alzheimer's Disease (AD) risk, in part, through changes in brain structure and function. Moreover, exercise-related structural changes in the brain, namely increased hippocampal volume, is linked to improved memory. However, there is limited data available on how exercise impacts brain insulin resistance in aging. It is also unclear if one bout of exercise may help improve brain insulin responses to insulin before fitness gains or weight loss in people at risk for dementia, type 2 diabetes and cardiovascular disease. Because single bouts of exercise are established to improve metabolic and vascular insulin sensitivity in people with obesity, the investigators anticipate exercise to raise brain insulin sensitivity in relation to cognition and cardiometabolic health.

Conditions

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Aging Obesity Insulin Resistance Cognition Cardiovascular Disease Risk

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Individuals will perform both rest and exercise conditions.

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Rest

Individuals will rest for about 1 hour in the seated position to mimic time exercising.

Group Type NO_INTERVENTION

No interventions assigned to this group

Exercise

Individuals will exercise for at medium to hard intensity for 1 hour.

Group Type EXPERIMENTAL

Exercise

Intervention Type BEHAVIORAL

Exercise will be walking/jogging at a medium to hard intensity for 1 hour.

Interventions

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Exercise

Exercise will be walking/jogging at a medium to hard intensity for 1 hour.

Intervention Type BEHAVIORAL

Eligibility Criteria

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Inclusion Criteria

* Male or female \>/=40 and \</=80 years old.
* Has a body mass index \>/=25 and \</=45 kg/m2.
* Physical Activity (\<150 min of moderate/high intensity exercise per week)

Exclusion Criteria

* Subjects who have not been weight stable (\>2 kg weight change in past 3 months)
* Subjects who are smokers or who have quit smoking \<1 years ago
* Subjects with abnormal estimated glomerular filtration rate (eGFR).
* Hypertriglyceridemic (\>400 mg/dl) and hypercholesterolemic (\>260 mg/dl) subjects
* Hypertensive (\>160/100 mmHg)
* Subjects with a history of significant metabolic, cardiac, congestive heart failure, cerebrovascular, hematological, pulmonary, gastrointestinal, liver, renal, or endocrine disease or cancer that in the investigator's opinion would interfere with or alter the outcome measures or impact subject safety.
* Pregnant (as evidenced by positive urine pregnancy test) or nursing women
* Subjects with contraindications to participation in an exercise
* Current Pregnancy
* Currently taking active weight suppression medication (e.g. phentermine, orlistat, lorcaserin, naltrexone-bupropion in combination, liraglutide, benzphetamine, diethylpropion, phendimetrazine)
* Subjects currently taking medications that affect heart rate and rhythm (i.e. Ca++ channel blockers, nitrates, alpha- or beta-blockers).
* Known contraindications for MRI imaging

Minimum Eligible Age

40 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No