remappingThe Effect of Exercise on Strength and Mobility and Corresponding CNS Plasticity in Multiple Sclerosis Patients: A Multimodal Neuroimaging Investigation

Rationale MEG is a direct measure of ongoing neurophysiological activity and is appropriate because of spatiotemporal resolution of measurements and immunity of the technique to vascular biases that contaminate functional MRI imaging of MS patients.4 MEG will help to illuminate the brain bases of motor deficits that exist relative to healthy controls and show how the improvements observed behaviorally are reflected in the brain activity that underlies those improvements. Since DTI has demonstrated the ability to find changes (plasticity) that occur in the brain in patients, it is very promising that DTI will be able to detect evidence of neuroplasticity in our research population.5 Using the MEG findings to sharpen the DTI analysis, a very powerful combination, will optimize the ability to detect and understand changes. Objectives Specific Aim 1 - Determine if there are activation differences (see below) in the neural regions serving motor function during basic movements using MEG in a group of MS patients, comparing MS affected portions of the brain versus non-affected. Specific Aim 2 - Determine the effect of a specific 6 month resistance and balance exercise program on activation in sensorimotor brain areas using MEG, and correlate changes in these neural indices with those of specific movement and balance. Specific Aim 3 - Determine the effect of a specific 6 month resistance and balance exercise program on brain diffusivity and fractional anisotropy using DTI and correlate changes in these metrics with improvement in strength and balance measures in subjects with MS, comparing MS affected portions of the brain versus non-affected areas.. Specific Aim 4 - Determine whether increased fiber integrity (fractional anisotropy) along the corticospinal tract is reflected in MEG activation metrics of the primary motor cortex from baseline to 6 months in subjects with MS enrolled in the three-month resistance and balance exercise program.