The history of electrical muscle stimulation (EMS) goes back further than most people realize: not to a lab or a gym, but to the waters of the ancient Nile. It winds through Roman physicians, 18th-century scientists, and hospital ICUs before it ever reached a wellness studio.
Here’s the history of EMS.
It Started With Electric Fish
The earliest known human encounter with bioelectricity appears on the walls of an Egyptian tomb. The burial place of the architect Ti at Sakkara, dating to approximately 2750 BC, depicts the Nile electric catfish among its fishing scenes — the oldest known human record of an electric creature.
By the time the Greeks and Romans were documenting these animals, the therapeutic potential of their shock was already being explored. The Greeks called electric fish narke — the root of the modern word “narcosis” — because of their numbing properties. Plato referenced the torpedo fish in his dialogue Meno. Aristotle described how it narcotized its prey by the shock power resident in its body.
The most significant early development came around 46 AD, when the Roman physician Scribonius Largus became the first person documented to deliberately use electrical discharge in clinical medicine. His prescription for chronic headache: place a live black torpedo on the painful spot until numbness is felt, then remove it.
For gout, patients stood barefoot on a live torpedo on a wet shoreline until the foot and leg went numb to the knee. Historians credit Scribonius Largus with the first application of electricity to medicine. The underlying principle — that electrical current could block pain — was real, even if the delivery mechanism was a fish.
The 18th Century Changed Everything
For over a thousand years, electric fish were used medicinally across cultures. A 1777 London advertisement even invited the public to be shocked by a “torporific eel” at two shillings and sixpence a session.
The scientific turning point came when electricity became controllable and directable. The Leyden jar, invented in 1745, gave researchers a practical way to store electrical charge and produce controlled shocks. Almost immediately, physicians recognized its similarity to the torpedo fish’s discharge and began formal experimentation.
Between 1750 and 1780, 26 papers on medical electricity appeared in the Journal de Médecine alone. An electric shock machine was installed at the Middlesex Hospital in London in 1767, with hospitals across Europe following within a decade.
Key figures emerged rapidly. Christian Gottlieb Kratzenstein used frictional electricity to induce movement in paralyzed fingers. Albrecht Haller advanced the theory of muscle irritability — that muscles could respond to external stimulation independently of voluntary will.
Caldani provided experimental proof by stimulating muscle contractions in animals using electrical devices. And in 1776, Luigi Galvani elicited a muscular contraction in a frog’s leg with an electrical stimulus, demonstrating that external electrical input could replicate the body’s own movement signals.
That single observation is the foundation of every electrical muscle stimulation device in existence today.
The Fall and the Revival
The 19th century became the golden age of electrotherapy, with electrical stimulation applied across four technological phases for conditions ranging from neurological disorders to gynecological conditions. Then it collapsed. At the turn of the 20th century, electrotherapy was dismissed as unscientific, tainted by charlatans, and pushed aside by pharmaceutical advances.
The revival came in the second half of the 20th century and was built on real science. Researchers identified two primary mechanisms behind electrical pain relief: blocking pain signals in the spinal cord before they reach the brain, and triggering the release of the body’s own pain-relieving chemicals, including endorphins, serotonin, and GABA.
Around the 1960s, functional electrical stimulation emerged as a dedicated therapeutic branch focused on producing functional movement in people whose nervous systems could no longer do so voluntarily.
What Medicine Did With It
In the ICU
Muscle mass can be lost at up to 5% per day during the first week of critical illness. Electrical muscle stimulation became essential here because it can be used on sedated patients without requiring voluntary effort. A systematic review of eight randomized controlled trials found NMES to be more effective than standard care alone in preventing muscle weakness, with moderate-to-strong evidence. It also reduced inflammatory markers and accelerated weaning from mechanical ventilation.
In spinal cord injury rehabilitation
Early recommendations focused only on voluntary arm exercise, limited by the small amount of muscle mass involved. Electrical stimulation changed that. Eight weeks of hybrid FES cycling produced a 33% increase in stroke volume and 28% increase in aerobic capacity. NMES resistance training increased knee extensor muscle size by 26–33% over 12 weeks. For people who cannot voluntarily exercise, these outcomes represent the difference between a body in metabolic decline and one that can maintain functional health.
In cerebral palsy
Research from 2004 onward demonstrated that NMES applied during walking improved ankle movement, walking speed, step length, and muscle volume in children with CP. Some studies showed carryover neurotherapeutic effects — benefits that persisted even when the device was not in use — suggesting real neuromuscular adaptation rather than temporary compensation.
History of EMS: From the Hospital to the Gym
As the evidence base grew, miniaturization of electronics made electrical muscle stimulation devices smaller, lighter, and more accessible. The FDA approved commercial devices, originally developed for stroke patients, as early as 2005. Russian space medicine had already demonstrated crossover potential by developing EMS protocols that maintained cosmonauts’ muscle function during long-duration spaceflight.
The principles that made electrical muscle stimulation powerful in medical settings, including muscle activation, reduced inflammation, improved circulation, and pain relief, turned out to be just as relevant for healthy people seeking to optimize performance and recovery. The leap to fitness wasn’t a departure. It was an extension of a very long line.
The Bottom Line
EMS is not a fitness trend. It is a medical technology with documented use dating back to 2750 BC and decades of rigorous clinical research, used in ICUs, rehabilitation centers, and among some of the most demanding patient populations in medicine. Understanding the history of EMS gives you a real basis for understanding what it can actually do.