What You Will Learn
- Why SCI is where most of the evidence was developed
- How to understand whether your muscles need standard or specialist stimulation
- What SCI-specific complications to be aware of
- Realistic expectations for your treatment
- The long-term health argument for electrical stimulation
1. Where the Evidence Was Built
Everything in this book, the science, the evidence, the devices, the protocols, was developed primarily in the context of spinal cord injury. The RISE programme enrolled patients with complete conus and cauda equina lesions. The treatment protocol was refined for paralysed lower limbs. The electrodes, assessment tools, and home-based treatment model were all designed for the SCI population.
And yet, some therapists working in spinal injury might have little experience with this approach. Many patients are told that electrical stimulation will not work for their particular injury. This is often true when the device in use is a standard unit, but it is categorically wrong if a specialist device such as the RISE stimulator is available. The gap between what the evidence supports and what patients actually receive is, in our experience, wider in SCI than in any other population covered in this book.
2. Understanding Your Stimulation Needs
Not all spinal cord injuries produce denervation, and this is the single most important distinction for electrical stimulation.
An upper motor neuron injury (as in thoracic-level SCI) disconnects the brain from the muscles but leaves the nerves to the muscles intact. The muscles are paralysed because they receive no command from the brain, but they remain innervated. Standard FES and NMES can activate these muscles. FES cycling, standing programmes, and conventional stimulation are appropriate.
A lower motor neuron injury (the typical presentation in conus medullaris and cauda equina lesions, generally at T12 and below) destroys the nerve supply itself. Standard stimulation produces no contraction whatsoever. These muscles need the specialist RISE protocol.
Many people have both types. A thoracic spinal cord injury may produce upper motor neuron damage in some muscles (spasticity, hyperactive reflexes) and lower motor neuron damage at the level of injury, where the nerve cells are directly damaged. A person with a T12/L1 injury may have spastic hip flexors (upper motor neuron) but flaccid quadriceps (lower motor neuron).
This is why assessment must test each muscle individually. The ASIA classification describes the overall injury level and completeness, but it does not tell you whether a specific muscle is denervated. Only the strength-duration test does that.
3. The Mixed Presentation Challenge
In our experience, the neat separation between upper- and lower-motor-neuron injury described in textbooks is the exception rather than the rule. Many SCI patients present with a mixture of both.
The practical implication is that the same person may need the specialist RISE protocol for some muscles, standard stimulation for others, and perhaps FES cycling for cardiovascular fitness. The assessment maps the denervation status of each muscle group, and the treatment plan is built around this map.
This mixed presentation also explains why many people with SCI have been told stimulation does not work. A clinician using a standard device on a denervated muscle will see no response and may conclude the treatment is ineffective. The reality is that the wrong device was used, not that the principle is flawed.
4. When to Start (and What Happens If You Do Not)
We are asked frequently whether it is too late to start. The honest answer is: starting early produces the best results, but it is rarely too late.
Within the first one to two years after injury, muscle fibres remain largely intact despite wasting. The basic architecture is preserved, and the response to stimulation is relatively quick. Beyond two to five years, up to 80 per cent of muscle mass may be lost, and fat replacement becomes extensive.
But the satellite cells persist. Research has shown that muscle stem cells remain viable even after more than twenty years of denervation. The biological machinery for recovery does not disappear. It waits.
In practice, we have seen meaningful improvements in people who started years after their injury. The timelines are longer, and the magnitude of improvement may be smaller. But tissue quality improves, girth measurements increase, and the long-term health benefits apply regardless of when treatment begins.
5. SCI-Specific Complications to Be Aware Of
Several complications specific to spinal cord injury interact with electrical stimulation. They do not prevent treatment; they shape how it is delivered.
Autonomic dysreflexia is primarily a risk for injuries at T6 or above. Stimulation below the injury level can trigger a sudden, dangerous rise in blood pressure, with symptoms including sudden headache, facial flushing, and sweating above the level of injury. This does not prevent treatment but requires education, blood pressure monitoring during initial sessions, and a clear action plan if symptoms develop. Most people we see with denervation due to SCI have lower-level injuries and are not at significant risk, but it must be checked.
Pressure injuries. The relationship is bidirectional. Reduced sensation, impaired circulation, and prolonged sitting put you at high risk. Electrode placement must avoid compromised skin. But electrical stimulation of denervated gluteal and thigh muscles has been shown to improve tissue quality and muscle bulk, thereby reducing pressure injury risk over time. This is one of the strongest arguments for treatment.
Spasticity affects muscles that retain their nerve supply (upper motor neuron muscles). FES cycling has been shown to reduce spasticity. For denervated (flaccid) muscles, spasticity is not an issue, but in mixed presentations, spastic muscles may be adjacent to denervated muscles, and the treatment plan must account for both.
Osteoporosis. Bone density declines rapidly after SCI. Electrical stimulation contributes to bone loading through the mechanical stress of muscle contraction, and combined with standing programmes, can help maintain bone health.
6. What a Treatment Day Looks Like
A typical early-phase session for bilateral lower limb denervation: you position yourself, typically lying down, with the leg muscles accessible. Large wet sponge electrodes are placed over the quadriceps on both legs and secured with elastic Velcro straps. The two-channel RISE Stimulator is connected and the prescribed programme selected. The current is gradually increased until a visible twitch is observed, then set to about 10 per cent above this threshold.
The session runs for approximately thirty minutes. This is repeated five to six days per week.
As the muscle responds (confirmed by improvements in the strength-duration test at periodic reviews), the programme progresses: pulse lengths shorten, frequency increases, and the treatment transitions from isolated twitches to sustained contractions. This may take six to twelve months for early starters, longer for late starters.
The early weeks are often the most challenging. You are investing thirty minutes a day and seeing little visible result. This is where realistic expectations and objective monitoring become essential. The first visible sign of progress is often improved tissue quality rather than increased size: the skin looks healthier, the tissue feels firmer. Photographs at each review provide visual evidence of progress.
7. The Long-Term Health Argument
The strongest argument for electrical stimulation in SCI may not be functional recovery, though that is achievable for some, but long-term health.
Every person, with or without a spinal cord injury, needs physical activity to maintain their health. For people with SCI, options are severely limited. Electrical stimulation provides what voluntary exercise cannot: active contraction of paralysed muscles, with all the benefits that muscle activity produces.
- Reduced pressure injury risk means fewer hospital admissions and less suffering.
- Improved bone density means fewer fractures.
- Better cardiovascular fitness means reduced risk of the metabolic and cardiac complications that are leading causes of death in the chronic SCI population.
- Preserved muscle mass means improved body composition, temperature regulation, and overall tissue health.
When we present this argument to funders, we frame it as prevention rather than cure. The cost of the equipment and clinical support is a fraction of the cost of treating a single serious pressure ulcer.
Chapter Summary
Spinal cord injury is where the evidence for denervated muscle stimulation was developed. The critical distinction is between upper motor neuron damage (where standard stimulation works) and lower motor neuron damage (where the specialist protocol is needed), and most SCI patients have both. Each muscle must be assessed individually. Starting early produces the best results, but late starters retain the biological potential for improvement. SCI-specific complications (autonomic dysreflexia, pressure injuries, spasticity, osteoporosis) shape how treatment is delivered but do not prevent it. The strongest argument for treatment may be long-term health: reduced pressure injury risk, preserved bone density, and improved cardiovascular fitness.