What You Will Learn
- The key milestones from the discovery that electricity can make muscles contract to today's treatment
- Why electrical stimulation has sometimes been associated with quackery, and why that association persists
- How the modern evidence base was built by the Vienna RISE programme
1. It Started with a Frog's Leg
The story begins, as these things sometimes do, with a frog's leg.
In 1791, Luigi Galvani, a professor of anatomy at the University of Bologna, published his observation that electricity applied to the nerve of a dissected frog produced contraction of the leg muscles. Galvani believed he had discovered "animal electricity," an intrinsic electrical force within living tissue. His contemporary Alessandro Volta disagreed, concluding that the metals in Galvani's apparatus were responsible. To prove his point, Volta built the first battery, one of the most consequential inventions in the history of science, born from an argument about a frog.
Both men were partly right. Every cell does have an electrical potential, and Galvani's "animal electricity" was real. The metals were also contributing. But for our purposes, the important legacy is this: by the early 1800s, scientists knew that electricity could cause muscles to contract. The question that followed, and that has driven the field ever since, was what to do with that knowledge.
2. From Spectacle to Science
Giovanni Aldini, Galvani's nephew, took the work in a dramatic direction. In the early 1800s, he toured Europe applying electrical current to the bodies of recently executed criminals. These demonstrations produced dramatic muscular contractions (jaws clenching, eyes opening, limbs rising) and contributed to the cultural moment that produced Mary Shelley's Frankenstein in 1818. The idea that electricity could somehow animate dead tissue captured the public imagination, though not always helpfully.
The Glasgow University Anatomy Theatre saw one of the most famous demonstrations. In 1818, Dr Andrew Ure applied electrical current to the exposed nerves of a recently executed man. The body convulsed, the chest heaved, and the face grimaced. Several spectators fled in terror.
The early nineteenth century was also an era of electric baths, galvanic treatments, and medical entrepreneurship of varying quality. The association between electrotherapy and dubious claims took hold early and has proved remarkably persistent.
The figure who most clearly bridges the age of spectacle and the age of clinical science is Duchenne de Boulogne. Working in Paris in the mid-nineteenth century, Duchenne was the first to systematically apply electrical stimulation to individual muscles in living patients. Crucially, he was the first to observe that denervated muscles respond differently to electrical stimulation than innervated ones, the same fundamental distinction that underpins the treatment described in this book. Duchenne identified the problem over 160 years ago. It would take another century and a half to solve it.
3. The Scientific Foundations
The early twentieth century provided the measurement tools that would eventually enable precise electrical stimulation. Around 1907, the French physiologist Louis Lapicque introduced the concept of chronaxie, a measure of how easily different tissues can be electrically stimulated. The large difference in chronaxie between normal and denervated muscle, which we touched on in Chapter 1, was first measured within Lapicque's framework. Without this, choosing the right settings for electrical stimulation would have remained guesswork.
But the figure whose work most directly shaped the modern field was Ernest Gutmann. Working in Czechoslovakia from the 1940s onwards, Gutmann conducted systematic research on the biology of long-term denervated muscle. His landmark 1962 publication was the first major synthesis of what was known about denervation and the potential for intervention. Critically, his work established that the pattern of electrical activity, rather than chemical signals from the nerve alone, is primarily responsible for maintaining muscle properties. This meant that electrical stimulation could, in principle, substitute for the lost nerve supply.
4. Modern FES Takes Off, but Denervated Muscle Is Left Behind
The 1960s marked the birth of modern functional electrical stimulation (FES). Researchers developed systems that could correct foot drop during walking, and the decades that followed saw an explosion of FES applications: cycling systems, standing programmes, and upper limb stimulation for grasp and reach.
But all of these applications relied on stimulation through intact nerves. The nerve acts as an efficient amplifier: a brief, low-current pulse activates it, and it does the rest. When the nerve is absent, this amplifier is gone, and the technical challenges of stimulating the muscle directly are formidable.
So while electrical stimulation for innervated muscle flourished, denervated muscle was set aside as a problem too difficult and too uncertain to pursue. For people living with denervated muscle, the message was essentially: there is nothing we can do.
5. Vienna: From Laboratory to Living Room
The answer came from Austria.
In the 1990s, Helmut Kern, an Austrian physician and rehabilitation specialist, together with the Italian researcher Ugo Carraro, set out to rigorously investigate what electrical stimulation could achieve for permanently denervated human muscle. Inspired by Gutmann's earlier work, they embarked on a systematic research programme spanning more than two decades.
What followed was the EU-funded RISE programme (Use of Electrical Stimulation to Restore Standing in Paraplegics with Long-Term Denervated Degenerated Muscles), bringing together researchers from Austria, Germany, Italy, the United Kingdom, Slovenia, and Iceland.
The results, published in 2010, were definitive: substantial gains in muscle mass and force, biopsy-confirmed structural restoration at the cellular level, and functional achievements including assisted standing in people previously considered unable to stand. The treatment involved daily home-based electrical stimulation using purpose-built devices capable of delivering the long, strong pulses needed to directly activate denervated muscle fibres.
The RISE programme also solved the technology problem. The emerging stimulators and electrodes could deliver the required treatment safely for daily home use. The RISE Stimulator we use today is the successor to the devices developed in this programme.
For the first time, a rigorous, multinational clinical programme had demonstrated that permanently denervated human muscle could be rescued. The field moved from "controversial" to "evidence-based," and the treatment moved from the research laboratory to the living room.
6. The Quackery Problem, and Why It Still Matters
There is an uncomfortable thread running through this entire history. From Aldini's demonstrations to today's consumer devices with exaggerated claims, electrotherapy has always attracted its share of dubious products and overpromising. The consequence is that many healthcare professionals approach electrical stimulation with greater scepticism than they might towards pharmaceutical or surgical treatments.
This scepticism sometimes means that people who could benefit from treatment are not told it exists. When you recognise that the science dates back to Galvani, that the measurement framework was established over a century ago, and that the clinical approach was systematically developed over twenty years by a multinational team with EU funding and peer-reviewed publications, you see a therapy with roots as deep as any in rehabilitation. The quackery is real, but it is not the full story. And the science has, ultimately, prevailed.
Chapter Summary
The story of electrical stimulation for denervated muscle spans more than two centuries. It begins with Galvani's discovery that electricity can make muscles contract and proceeds through Aldini's dramatic demonstrations, Duchenne's clinical insight, Lapicque's measurement tools, Gutmann's biological synthesis, and ultimately the Vienna RISE programme. Modern FES developed rapidly from the 1960s but focused on nerve-mediated stimulation, leaving denervated muscle behind because the technical challenges were formidable. The breakthrough came from the EU-funded RISE programme, which demonstrated biopsy-confirmed structural restoration in permanently denervated human muscle through daily home-based stimulation. Throughout this history, the association of electrotherapy with quackery has created a credibility barrier that continues to limit awareness, despite a scientific heritage as deep as any in rehabilitation medicine.