Functional Electrical Stimulation Cycling and Muscle Oxidative Capacity in Two Non-Ambulatory People with MS
Objectives: To describe differences in FES cycling performance and muscle oxidative capacity in two non-ambulatory individuals with MS who participated in a 4-week FES cycling intervention.
Methods: Participants were part of a larger trial in which they trained on an FES cycle 30 mins/day, 2-3 days/week for 4 weeks. FES cycling performance was collected during each session. Muscle oxidative capacity (mVO2) was measured in the right vastus lateralis muscle using near infrared spectroscopy before and after the FES cycling training program.
Results: Both individuals safely exercised on the FES cycle for 4 weeks, without adverse events. Both presented with mVO2 lower than that in able-bodied individuals. One was able to increase time and resistance during cycling over the 4-week period. She also demonstrated greater mVO2 than the participant who was unable to improve cycling performance; she also had an increase in mVO2 after training, while the other participant showed a decrease.
Conclusions: Muscle oxidative capacity may influence muscle performance in people with MS who are non-ambulatory. Exercise may impact muscle oxidative capacity and function. This may be an important consideration when prescribing exercise and choosing interventions for people with MS who are non-ambulatory. The relationship between exercise and muscle oxidative capacity requires further investigation in people with MS.