This study seeks to explore changes in the neural pathways and arm function following a breathing intervention in the multiple sclerosis (MS) population. The breathing intervention, known as Acute Intermittent Hypoxia (AIH), involves breathing brief bouts of low levels of oxygen. Research has found AIH to be a safe and effective intervention resulting in increased ankle strength in people with MS. Here, the study examines arm and hand function before and after AIH. In order to better understand the brain and spinal cord response to AIH, the investigators will measure muscle response, and signals sent from the brain to the arm muscles before and after AIH.
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Motor Evoked Potentials (MEPs) in First Dorsal Interosseous (FDI)
Timeframe: Immediately before, immediately after, and 60 minutes after the intervention.
Changes in Spinal Reflex Threshold
Timeframe: Immediately before the intervention and immediately after the intervention.
Threshold For Detecting Passive Joint Movement
Timeframe: Immediately before the intervention and immediately after the intervention.
Accuracy of Direction Estimation of Passive Joint Movement
Timeframe: Immediately before the intervention and immediately after the intervention.