19/07/2026
I’m writing this post because a client recently asked me about high-intensity PEMF after seeing it promoted on social media.
Owners may recognise this treatment from videos showing a large handheld coil being moved over the horse while the muscles contract, twitch or visibly “jump.” These dramatic muscle contractions are often used in advertising because they look impressive, but visible movement does not tell us whether the treatment is appropriately dosed, clinically indicated or producing the desired therapeutic response.
High-intensity PEMF has become increasingly fashionable and is sometimes offered by people without recognised veterinary rehabilitation qualifications or sufficient education in pathology, neurology, tissue healing and electrotherapy dosage. Before booking treatment, owners should ask what qualifications the practitioner holds, how the dose is selected for their horse, what outcome is being targeted and what evidence supports that particular treatment plan.
🧠 High-Intensity PEMF… Are we asking the right questions? 🐴⚡
As a Veterinary Physiotherapist with a particular interest in neurology and rehabilitation, there is something I’ve been reflecting on recently that I think is worth discussing.
This isn’t an anti-PEMF post.
It’s a post about clinical reasoning, therapeutic dosing and making informed choices.
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⚡ Not all PEMF is the same
One thing I believe is often misunderstood is that low-intensity PEMF and high-intensity PEMF are frequently discussed as though they are the same therapy.
They are not.
Although both use pulsed electromagnetic fields, that doesn’t automatically mean they produce the same biological response.
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📚 What does the evidence tell us?
Low-intensity PEMF has a much stronger body of scientific evidence supporting its use for areas such as:
✅ Bone healing
✅ Delayed tissue repair
✅ Pain modulation
Importantly, these beneficial effects are achieved through carefully prescribed cumulative doses over time.
More energy does not necessarily equal a better therapeutic response.
This principle has been taught to physiotherapists for many years through the work of Professor Tim Watson, whose research and teaching on electrotherapy emphasises that every electrophysical agent should be prescribed according to:
🔹 The tissue being treated
🔹 The stage of healing
🔹 The desired physiological response
🔹 Appropriate treatment dosage
In other words…
Electrotherapy is a prescription—not simply the application of energy.
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🧬 Why does dosage matter?
Every cell in the body communicates through electrical and biochemical signalling.
Electrotherapies don’t “heal” tissues themselves.
Instead, they aim to influence the body’s own repair mechanisms.
The biological response depends upon the dose prescribed, including:
• Treatment intensity
• Frequency
• Pulse characteristics
• Treatment duration
• Number of treatments
• Stage of tissue healing
Just as medication has an optimal dose…
Electrotherapy also has an optimal therapeutic window.
Too little may produce little effect.
Too much isn’t necessarily better.
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⚡ So where does High-Intensity PEMF fit?
High-intensity PEMF is an exciting and evolving technology.
However, the evidence base for optimal dosing, particularly regarding neurological tissues, is still developing.
For that reason, I don’t believe we should automatically assume that the biological principles demonstrated with low-intensity PEMF can simply be transferred to high-intensity systems.
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🧠 A question that has made me think…
During my own clinical practice, I’ve started asking myself an interesting neurophysiological question.
In some horses that have previously received high-intensity PEMF, I’ve observed:
🐎 Reduced pain responses
🐎 Reduced flight arc
🐎 Subtle proprioceptive deficits
🐎 Mild incoordination or ataxia
This does not prove cause and effect, and many factors could contribute to these findings.
However…
Could excessive stimulation in some horses—particularly those with underlying neurological compromise—temporarily alter sensory input or neuronal excitability?
If proprioceptive feedback becomes less precise…
Could motor timing also become less precise?
Could this explain why a horse appears more comfortable, yet demonstrates subtle neurological deficits dynamically?
At present, this remains a clinical hypothesis, not an established fact.
But I believe it is a question worthy of scientific investigation.
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🎓 Why training matters
This is where I believe education becomes incredibly important.
In the UK, physiotherapists spend years studying:
✔️ Anatomy
✔️ Physiology
✔️ Pathology
✔️ Tissue healing
✔️ Neurophysiology
✔️ Evidence-based electrotherapy
✔️ Therapeutic dosing
These principles underpin the safe use of electrotherapies such as therapeutic ultrasound, laser therapy, radiofrequency and other electrophysical agents.
High-intensity PEMF, however, is now widely available and can be purchased by individuals with very different levels of training and understanding.
Owning advanced technology is not the same as understanding its biological effects.
Technology should support clinical reasoning, not replace it.
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💬 My hope…
This isn’t about criticising any profession or any particular technology.
It’s about encouraging discussion.
As rehabilitation professionals, we should continue asking:
❓What biological response am I trying to achieve?
❓Is this the correct dose?
❓Is this the correct stage of healing?
❓Is this the right patient?
❓What evidence supports the treatment I’m prescribing?
Our patients deserve treatments that are guided not only by innovation, but by science, clinical reasoning and evidence-based practice.
I’d genuinely love to hear the thoughts of fellow veterinary physiotherapists, veterinary surgeons, chiropractors and rehabilitation professionals.
Healthy professional discussion is how we continue to improve standards of care for the horses entrusted to us. 🐴
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