tDCS and Glucose Uptake in Leg Muscles

Prospective participants, men and women with MS, will be recruited. The plan is to enroll up to 30 to get 20 evaluable subjects. To accomplish this study, all participants will need to complete 3 sessions. The first session at the INPL and sessions 2 and 3 at PET Imaging Center (0911ZJPP) and the PET Imaging lab in Pappajohn Biomedical Discovery Building. Session 2 and 3 are separated by 5-8 days. The duration of each session will be approximately 120 minutes. We expect data collection to last 6 months. In the first session, subjects will be consented, complete the PDDS, the Fatigue Severity Scale (FSS), and maximal voluntary contractions (MVCs) of the right and left knee extensors and flexors to determine the more-affected leg. When leg strength difference is less than 10%, the more affected side will be based on self-report. The second and the third sessions will involve 20 min walking on a treadmill at a self-selected speed during which time tDCS or SHAM will be applied to the motor cortex (M1) corresponding to the more-affected leg and \[18F\]fluorodeoxyglucose will be administered. At the end of the walking period, the subject will be imaged on a PET/CT scanner from top of head to toes. Prior to sessions 2 and 3, all subjects will be asked to fast (water and medication can be taken during this time) for a minimum of 6 hours prior to the FDG administration. In addition, the blood glucose level will be checked (via Accuchek) prior to FDG administration and the level must be equal to or less than 200 mg/dL in order to proceed with the FDG administration on that day. At the beginning of session 2 and 3, the subject will be weighed and height measured, have a blood glucose level determined via Accuchek as described above, undergo a urine pregnancy test if the subject is of child-bearing potential, and have an IV catheter inserted for FDG administration. The subject will then be moved to the PET Scanner area in Pappajohn Biomedical Discovery Building. The subject will be asked to use the restroom prior to walking on the treadmill. A tDCS device (Soterix) will deliver a small direct current through two sponge surface electrodes (5cm × 5cm, soaked with 15 mM NaCl). The positive electrode will be placed over the motor cortex representation of the more affected leg, and a second electrode will be placed on the forehead above the contralateral orbit. The participant will receive tDCS or SHAM throughout the walking (i.e., for 20 min). In the tDCS trial, the intensity will start at 0 mA and will increase to 3 mA over the first 30 seconds. In the sham condition, the participants will receive the initial 30 seconds of stimulation, after which the current will be set to 0. Two min into the walking test on the treadmill, 10 mCi of \[18F\]-FDG will be injected IV. Then, the walking test continues until 20 min is reached. When the walking test is completed, the tDCS device will be removed and the subject will be positioned in the PET/CT scanner and a whole body (top of head to toes) PET/CT scan will be acquired. Ratings of perceived exertion (RPE) will be recorded with the modified Borg 10-point scale (Borg, 1982). The subjects will be instructed to estimate the effort during walking. The scale will be anchored so that 0 denotes the resting state and 10 represents the strongest effort. No long-term follow-up will be done.