Multiple Sclerosis Clinical Trial
Official title:
Aerobic Exercise to Improve Brain Metabolism in MS
The purpose of this study is to learn more about multiple sclerosis (MS). The investigators
are studying whether aerobic exercise is better than a stretching program at improving brain
health in people with MS. We want to learn:
1. If it is safe and practical for people with MS to participate in an aerobic exercise
program with the goal of increasing cardiac fitness. Cardiac fitness is measured with
exercise stress tests at the beginning and end of the study.
2. If aerobic exercise improves brain metabolism, a reflection of brain health, more than
stretching. Brain metabolism is measured by MRIs at the beginning and end of the study.
There is a 50% chance of being in the aerobic exercise or the stretching program.
There are between 8 and 36 visits to OHSU, depending on the intervention group. The total
duration of the study is at most 21 weeks.
Multiple sclerosis (MS) is a disease of brain, spinal cord and optic nerves. Current MS
therapies reduce the frequency and severity of MS flare-ups, but do not help MS in later
stages of disease characterized by slow progression of disability. One obstacle to developing
therapies for progressive aspects of disease is a lack of ability to measure progression and
brain repair.
A new MRI technique developed by Bill Rooney, PhD, (co-investigator, OHSU Advanced Imaging
Resource Center) looks at brain health by measuring levels of phosphorous. Phosphorous levels
are thought to reflect energy stores produced by brain cells. The healthier the brain, the
greater the energy stores seen as higher the levels of phosphorous on imaging. Dr. Rooney has
shown decreased levels of phosphorous on brain MRIs from people with MS. We propose that
therapies that boost brain cell health will lead to an increase in brain cell energy stores
and be reflected by an increase in phosphorous levels on MRI spectroscopy.
In order to test whether improvements in brain energy stores can be seen as increased
phosphorous levels, we will use a therapy known to improve energy stores in muscles and see
if it also does so in the brain. We measure how much aerobic exercise increases energy stores
in muscles by measuring oxygen utilization during an exercise stress test. Therefore in this
study, we will see if the aerobic exercise that improves muscle energy stores (seen as an
increase in oxygen utilization) corresponds to an increase in brain energy stores (seen as an
increase in phosphorous levels).
Specific Aim 1. To determine if it is safe and feasible to conduct an aerobic exercise
intervention in MS patients to achieve an increase in oxygen utilization by 5-15%.
Hypothesis: An MS cohort undergoing a structured aerobic exercise program will increase their
aerobic capacity by 5-15% as measured by oxygen utilization testing and not experience
adverse events related to the exercise program.
Specific Aim 2. To determine if brain phosphorous levels by MR spectroscopy before and after
an aerobic exercise intervention increases in association with increases in oxygen
utilization.
Hypothesis: Aerobic exercise will increase energy stores in both muscles and the brain. Body
energy stores will be measured by oxygen utilization testing and brain energy stores by
phosphorous levels. We expect that increases in by oxygen utilization after a structured
exercise program will be associated with increases in phosphorous levels. We do not expect
increases in either by oxygen utilization or phosphorous levels in an MS cohort matched for
sex and baseline aerobic capacity that participates in a non-aerobic stretching program of
the same duration and intensity.
Outcome measures: The primary outcome is change in brain phosphorous levels by MRI
spectroscopy. The secondary outcomes are changes in oxygen utilization levels, walking and
balance tests, and changes in cognitive function and energy levels.
Methods: Participants will be enrolled over a 1 year period. Potential subjects will undergo
a baseline exercise stress test for oxygen utilization. Participants matched by sex and
baseline oxygen utilization level will undergo a baseline MRI spectroscopy study and then be
randomly assigned to either an aerobic exercise program or a self-guided stretching program.
The aerobic exercise program consists of supervised 30 minute sessions of either treadmill or
stationary bicycle exercise, 4 days per week for 8 weeks. The self-guided home stretching
program consists of 30 minute sessions, 4 days a week for 8 weeks with supervised sessions
occurring every 2 weeks. All participants will undergo a final exercise stress test and MRI
spectroscopy. Only participants who are matched and assigned to either exercise or stretching
groups will undergo MRI testing and receive payment for participation.
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