Improving the Efficiency of Electrical Stimulation Activities After Spinal Cord Injury.

In order to enhance spinal cord injury (SCI) rehabilitation programs using neuromuscular electrical stimulation (NMES) and functional electrical stimulation (FES) it is important to examine the manner in which muscle fibers are recruited and the dose-response relationship. A review of the literature suggests that premature force decline and early fatigue with NMES and FES activities may be alleviated with decreased current frequency and increased current intensity. Dose-response relationships with NMES and FES are dependent on the goals of interest as reversing muscle atrophy can be achieved with activities 2-3 times per week for 6 or more weeks while increasing bone mass is more limited and requires more intense activity with greater exercise frequency and duration, e.g., 3-5 days per week for at least 6-12 months. The best known protocol to elicit neurological improvement is massed practice activities-based restorative therapies (ABRT) (3-5 h per day for several weeks).