Quick Overview
A 2022 peer-reviewed Polish hospital study tested NMFES, a clinical form of EMS, after ischemic stroke.
Scientists used electroneurography on 120 patients and 60 healthy volunteers. They recorded M-wave amplitude in the peroneal nerve.
The EMS plus PNF group rose from 5268 µV to 6009 µV in 60 days (p = 0.04). Exercise alone did not. Skin pads, not needles, delivered supervised pulses.
Poznań University of Medical Sciences and MDPI published the work after ethics review.
The numbers suggest added clinic EMS can support lower-limb nerve signals beside standard rehab.
Read the full post for protocol, limits, and tables.
We always provide direct links to the original research at the end of every article so you can review the evidence yourself.
Skin electrodes, not syringes: Polish stroke study saw stronger leg nerve signals with supervised EMS
This article explains one published study. It is not medical advice. It does not advertise a product. In Australia, TGA rules limit health claims. Electrical stimulation after stroke belongs under a clinician’s care.
Purpose
The team asked whether neuromuscular functional electrical stimulation, a clinical form of EMS, could aid nerve signals after ischemic stroke. They tested skin-surface pulses plus PNF exercise. They compared that plan with PNF exercise alone. No extra pills and no needles were part of the stimulation itself. Standard hospital care still continued.
They used electroneurography, or ENG. That test records M-waves and F-waves. Those traces show how motor nerves fire.
Why this write-up rests on a real paper
The study appeared on 8 January 2022. The journal was the International Journal of Environmental Research and Public Health. MDPI in Basel published it after peer review. Ethics approval came from the University of Medical Sciences in Poznań. The file number was 1279/18. The work followed the Declaration of Helsinki.
Katarzyna Kaczmarek worked on the Neurology Ward at Pomeranian District Hospital in Koszalin. Juliusz Huber and Katarzyna Leszczyńska work at the Department of Pathophysiology of Locomotor Organs in Poznań. Przemysław Daroszewski is from the same medical university. Poland has a long scientific line, from Copernicus to today’s teaching hospitals. This was ward-and-rehab research, not a shop-floor pitch.
A two-month story on the ward
Doctors first met people in the raw days after stroke. Scans had already shown ischemic damage. Some lesions sat deep under the cortex. Others sat toward the front and side of the brain.
One hundred and forty-five patients were screened. Sixty healthy volunteers gave normal values. After dropouts, 120 patients finished. Sixty received NMFES plus PNF. Sixty received PNF only.
Patients were about 62 to 65 years old. Volunteers were younger, about 49. The authors flagged that age gap. Mean follow-up was 62 to 63 days.
How the pulses were given
This was not a home gadget free-for-all. A physician and a physiotherapist locked the settings. They based the dose on early sEMG and ENG readings.
Sessions lasted about 15 to 20 minutes. Treatment ran five days a week. Average pulse-train rate was 48.6 Hz. Pulse width averaged about 14 milliseconds. Current was about 26 mA in the arm and 25 to 28 mA in the leg. People raised strength only until a visible, bearable twitch appeared.
Logged time almost matched the plan. Expected stimulation was 19.2 hours. The device recorded 18.4 hours. Nobody in this trial reported NMFES pain or other side effects.
Exercise was heavy in both groups. Therapists used PNF patterns for about three hours on weekdays. EMS here meant sticky pads on skin. It was not an injection and not a tablet.
The numbers that moved
Healthy peroneal M-wave height averaged 8677 µV. Stroke legs started far lower. The EMS group began at 5268 µV. The exercise-only group began at 5432 µV.
After two months the EMS group reached 6009 µV. That rise from day one was statistically significant at p = 0.04. The exercise-only group finished at 5224 µV. That change was not significant.
Nerve delay, or latency, barely budged. The gain looked like stronger axonal output, not a sudden speed fix. Arm ulnar traces did not show the same lift. F-wave counts from the peroneal nerve stayed below healthy norms.
So the clear bright result was this. Regular, supervised EMS plus therapy improved one key lower-limb nerve reading. Therapy alone did not.
What “bright side” can honestly mean
The hopeful point is modest and real. A personalised, controlled pad-based protocol beat exercise alone on peroneal M-wave amplitude. The rise appeared by three weeks. It held at two months.
That is not a licence for “more shock is better.” This paper used short, tailored sessions under lockable settings. It does not prove EMS heals the brain injury. Patients still sat below healthy amplitudes at the end. The arm nerve did not match the leg result. Follow-up lasted only two months. Grouping was not a perfect random draw. Some people could not, or would not, have stimulation.
The study also does not replace prescribed stroke medicine. The authors themselves list drugs and therapy as standard care. EMS in this trial was an add-on with surface electrodes.
Take-home
Purpose: measure whether clinic NMFES plus PNF changes nerve transmission after ischemic stroke. Finding: peroneal M-wave amplitude rose in the EMS group and not in the exercise-only group. Method: skin electrodes, no needles in the stimulator itself.
Read this as one peer-reviewed Polish hospital study. Ask a rehabilitation specialist before any stimulator. TGA oversees therapeutic goods and advertising in Australia. A journal paper is a talking point for clinic, not a shopping slogan.
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Research Summary
| Topic | Detail |
|---|---|
| Original study | Open-access paper: https://www.mdpi.com/1660-4601/19/2/713 (DOI: https://doi.org/10.3390/ijerph19020713) |
| Full title | Electroneurographic Evaluation of Neural Impulse Transmission in Patients after Ischemic Stroke Following Functional Electrical Stimulation of Antagonistic Muscles at Wrist and Ankle in Two-Month Follow-Up |
| Who ran it | Katarzyna Kaczmarek (Pomeranian District Hospital, Koszalin); Juliusz Huber and Katarzyna Leszczyńska (Department of Pathophysiology of Locomotor Organs, University of Medical Sciences, Poznań); Przemysław Daroszewski (same university, health-care management) |
| Where it was published | International Journal of Environmental Research and Public Health, 2022, 19, 713, by MDPI (Basel). Received 10 Dec 2021; accepted 6 Jan 2022; published 8 Jan 2022 |
| Purpose | To test whether personalised NMFES (a clinical form of EMS) plus PNF exercise improved motor-nerve transmission after ischemic stroke, compared with PNF alone |
| People studied | 120 stroke patients finished analysis (60 NMFES+K, 60 K only) plus 60 healthy volunteers. Patients were about 62–65 years old; controls about 49 |
| Design | Two-group rehab comparison with tests at T0 (within 7 days of stroke), T1 (~21 days), and T2 (~60 days). Mean observation 62–63 days |
| What was treated | Antagonistic muscles at wrist and ankle on the paretic side, using skin electrodes. Exercise was the same in both groups: PNF and about 3 hours of weekday kinesiotherapy |
| EMS dose | Portable four-channel stimulator; sessions ~15–20 min, five days a week. Mean train frequency 48.6 Hz; pulse width ~14 ms; current ~26 mA arm and 25–28 mA leg. Expected stimulation 19.2 hours; device logged 18.4 hours |
| How scientists measured | Electroneurography (ENG) of ulnar and peroneal motor fibres on the weaker side: M-wave amplitude/latency and F-wave frequency. Keypoint System (Medtronic) |
| Strongest nerve-signal change | Peroneal M-wave amplitude in the EMS group rose from 5268 ± 1211 µV at T0 to 6009 ± 928 µV at T2 (p = 0.04). Exercise-only group went from 5432 ± 1125 µV to 5224 ± 1005 µV (not significant). Healthy reference: 8677 ± 1122 µV |
| What did not improve the same way | Ulnar M-wave amplitude did not show a matching gain. Peroneal latency stayed similar. Peroneal F-wave frequency stayed below the healthy mean of 19 ± 1 |
| Safety in this trial | No patient reported NMFES side effects, including pain. Stimulus strength was raised only until a visible, tolerable contraction |
| Authors’ conclusion | After 60 days, only the combined NMFES plus kinesiotherapy group improved significantly on peroneal M-wave recordings. Combined, supervised electrotherapy plus therapy gave better ENG results than therapy alone |
| Limits to keep claims honest | Two-month follow-up; arm nerves did not match the leg result; patients still sat below healthy amplitudes; grouping was not a perfect lottery; age differed from controls; this was add-on hospital rehab, not a substitute for prescribed stroke medicine. Ethics approval: Bioethics Committee, University of Medical Sciences, Resolution 1279/18 |
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