The goal of this clinical trial is to find out if Vibrotactile Stimulation (VTS) can help improve mobility and reduce spasticity (muscle stiffness) in people with lower limb spasticity. The study will also look at how VTS affects walking speed. The main questions it aims to answer are: * Which areas of the body are the best for applying VTS? * Does VTS help improve walking speed in people with lower limb spasticity? Participants will: * Receive 15 minutes of VTS treatment on different parts of the body * Use the VTS device for 60 minutes during supervised lab sessions and at home (at rest and while walking) * Complete a daily log of how much time the device was used for and note any issues or difficulties the participant experience * Complete assessments after the treatment to measure change in mobility * Complete surveys about how comfortable the device is to use
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H-reflex amplitude Baseline (Aim 1)
Timeframe: Baseline measurement immediately before three 15-minutes intervention periods within a single session (Day 1) for Aim 1
H-reflex amplitude After Intervention (Aim 1)
Timeframe: Immediately after each of three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Surface EMG activity of gastrocnemius/soleus Baseline (Aim 1)
Timeframe: Baseline measurement immediately before three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Surface EMG activity of gastrocnemius/soleus After Intervention (Aim 1)
Timeframe: Immediately after each of three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Modified Ashworth Scale at Screening
Timeframe: Screening Visit (-0 to 7 days prior to Aim 1 intervention)
Modified Ashworth Scale at Baseline (Aim 1)
Timeframe: Baseline measurement immediately before three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Modified Ashworth Scale After Intervention (Aim 1)
Timeframe: Immediately after each of three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Modified Ashworth Scale at Baseline (Aim 2)
Timeframe: Baseline measurement immediately before intervention for 3 consecutive days for Aim 2
Modified Ashworth Scale After Intervention (Aim 2)
Timeframe: Immediately after intervention for 3 consecutive days for Aim 2
Passive range of motion at the ankle at Screening
Timeframe: Screening Visit (-0 to 7 days prior to Aim 1 intervention)
Passive range of motion at the ankle at Baseline (Aim 1)
Timeframe: Baseline measurement immediately before three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Passive range of motion at the ankle After Intervention (Aim 1)
Timeframe: Immediately after each of three 15-minutes intervention periods within a single session (Day 1) for Aim 1
Passive range of motion at the ankle at Baseline (Aim 2)
Timeframe: Baseline measurement immediately before intervention for 3 consecutive days for Aim 2
Passive range of motion at the ankle After Intervention (Aim 2)
Timeframe: Immediately after intervention for 3 consecutive days for Aim 2
10 meter walk test at Baseline (Aim 2)
Timeframe: Baseline measurement immediately before intervention for 3 consecutive days for Aim 2
10 meter walk test at Baseline After Intervention (Aim 2)
Timeframe: Immediately after intervention for 3 consecutive days for Aim 2