The role of the cerebello-thalamo-cortical loop in the generation of tremor, gait impairments and postural instability has been made evident. The current study will use a Magstim Rapid 2 to deliver rTMS with the aim of modulating the activity in the vermal/paravermal region of the cerebellum, and consequently the cerebello-thalamo-cortical pathway. Analysis of the effects of an acute session of stimulation will be made to determine the therapeutic potential of the protocol. Motor symptom improvement will be assessed immediately following stimulation to detect motor symptom improvement up to one hour following stimulation, providing insight into the effectiveness of the protocol to produce benefits which outlast the period of stimulation. Participants will each receive one session of stimulation in the ON state of medication. A pre-assessment will be performed before beginning the session and a post-assessment will be performed immediately following stimulation. There will be two groups, which will both undergo the exact same protocol, however one group will receive real stimulation, and one group will receive sham stimulation.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
50
Sun Life Financial Movement Disorders Research & Rehabilitation Centre
Waterloo, Ontario, Canada
RECRUITINGGait (GaitRite carpet using Zeno software to measure spatial and temporal aspects of gait.)
5 trials of self-paced gait on a GaitRite carpet using Zeno software to measure spatial and temporal aspects of gait.
Time frame: Immediately post stimulation, effects up to one hour
Balance: Postural Stability Testing (quiet stance on a balance force plate)
3 trials lasting 30 seconds each of quiet stance on a balance force plate, where postural deviations from a central reference point on the platform will give an overall measure of postural sway, as well as score in the medial-lateral and anterior-posterior direction
Time frame: Immediately post stimulation, effects up to one hour
Balance: Sensory Integration Testing (modified clinical test of sensory integration on balance (m-CTSIB)
In accordance with the modified clinical test of sensory integration on balance (m-CTSIB), where four trials lasting 20 seconds each measure balance during various sensory conditions: 1) eyes open, firm platform, 2) eyes closed, firm platform, 3) eyes open, foam platform, 4) eyes closed, foam platform.
Time frame: Immediately post stimulation, effects up to one hour
Tremor: Kinesia Homeview Tablet (tremor magnitude, frequency and amplitude can be measured with wireless finger accelerometer)
With the use of a wireless finger accelerometer, tremor magnitude, frequency and amplitude can be measured during the upper limb movement tasks (such as rapid alternation and pointing tasks)
Time frame: Immediately post stimulation, effects up to one hour
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