The Effect of High Intensity Interval Training on Cardiovascular Fitness in People With Progressive Multiple Sclerosis.

This is a pilot trial to explore the cardiovascular of eight weeks of twice weekly high intensity interval training in people with progressive multiple sclerosis. A control group of people with progressive multiple sclerosis will undergo continuous moderate intensity exercise, twice weekly for 8 weeks. The training program will entail 6x1.5 minute intervals working at 80-95% heart rate max on a cycle ergometer. Each interval will be interspersed with 1.5 minutes of working rest at a light resistance of the participant's choosing. The continuous moderate intensity exercise program will entail 20 minutes on a cycle ergometer working at 60-70% heart rate max.