If you’ve been searching for IMS in Vancouver — or wondering whether dry needling could help your stubborn neck pain, recurring hamstring tightness, or that nagging shoulder — this is for you.
IMS stands for Intramuscular Stimulation. It’s a treatment we use at GroundSwell Physio that targets tight, irritable muscles using a fine acupuncture-style needle. It looks a lot like acupuncture from the outside, but the philosophy behind it is very different.
Here’s what you actually need to know before your first session.
What IMS Actually Is
IMS was developed right here in Vancouver by Dr. Chan Gunn in the 1970s. Dr. Gunn was working with chronic pain patients at the Workers’ Compensation Board and noticed that a huge portion of “mystery” musculoskeletal pain came from shortened, irritable muscles being driven by an over-sensitised nervous system.
He developed a needling technique that goes straight into the belly of those tight muscle bands. The needle is thin and solid — there’s no medication injected. When the needle hits a tight band, the muscle responds with a quick twitch (we call it a “local twitch response”), and then the muscle releases.
That release is the point of the treatment.
How IMS Is Different From Acupuncture
Acupuncture follows traditional Chinese meridian theory and focuses on energy flow through specific points. IMS is based purely on Western anatomy and neuroscience — needles go into muscles, not points. The goal is mechanical and neurological: release the tight band, calm the nerve supply, restore normal movement.
You’ll sometimes hear it called “dry needling,” which is the broader North American term. Gunn-IMS is one specific style of dry needling.
Why We Also Needle Near the Spine
One of the things that makes Gunn-IMS distinct is that we don’t just treat where it hurts. A core principle is that many peripheral muscle problems — a chronically tight calf, a recurring hamstring strain, a shoulder that keeps flaring up — are being driven by irritation at the nerve root, where the nerve exits the spine.
When a nerve root is mildly compressed or sensitised (often by tight paraspinal muscles), every muscle that nerve supplies downstream can become shortened and irritable. You can stretch and roll those peripheral muscles forever, but if the nerve root is the driver, they keep coming back.
That’s why a typical IMS session often includes needling the paraspinal muscles at the relevant spinal segment — not because your back hurts, but to release tension on the nerve root that’s feeding the problem further down the chain. For a stubborn calf, we might needle the calf and the lower lumbar segment. For a cranky shoulder, we might needle the shoulder and the lower cervical/upper thoracic segments.
This is often the piece that gets results when peripheral treatment alone hasn’t worked.
What It’s Used For
At GroundSwell, we use IMS most often for:
- Chronic neck and upper back tightness (especially desk-related)
- Recurring hamstring or calf strains in runners
- Stubborn glute or hip pain that hasn’t responded to stretching
- Plantar fasciitis and Achilles issues
- Shoulder impingement and rotator cuff irritation
- Tension headaches driven from the neck
IMS is rarely the only thing we do — it’s usually combined with hands-on work, exercise, and load management. It’s a tool, not a treatment plan on its own.
What It Actually Feels Like
I’ll be honest: most people feel the needle going in (a small pinch), but the bigger sensation is when the muscle twitches. That can feel like a deep ache or a cramp for a second, then it lets go. A lot of patients describe it as “good pain” — the kind of release you feel after deep tissue work on a really tight spot.
It’s not the same as acupuncture, where you usually don’t feel much at all. IMS is more intense in the moment, but the muscle response is what makes it work.
What to Expect After a Session
The most common after-effect is muscle soreness — like you did a hard workout for that body part. It usually settles in 24 to 48 hours. Some people get small bruises, especially in areas with thinner tissue. Light movement, hydration, and gentle stretching the next day all help.
If anything, you want to move after IMS, not rest. The treatment opens a window where the muscle is willing to lengthen and behave differently — moving through that window helps the change stick.
Who Shouldn’t Get IMS
A few situations where we’d hold off or modify:
- You’re on blood thinners (we’d be more conservative)
- You have a needle phobia that hasn’t been worked through
- Active local infection in the treatment area
- Pregnancy in the first trimester (we avoid certain regions)
A good physiotherapist will screen for these before starting. If IMS isn’t right for you, there are plenty of other effective options.
How IMS Fits Into a Session at GroundSwell
A typical first visit is a full assessment — movement, strength, history, the whole picture. If we decide IMS is appropriate, it’s one part of the session, not the whole thing. We pair it with hands-on treatment, exercise programming, and a clear plan for what to do between sessions.
The goal isn’t to be needling you every week forever. It’s to use IMS strategically to get the muscle quiet enough that you can rebuild strength and capacity — so the pain doesn’t come back.
Curious If It Would Help You?
If you’ve been dealing with a persistent muscle issue and you’re wondering whether IMS could be part of the answer, the easiest next step is to book an assessment. We’ll walk through what’s going on and figure out together whether needling is the right tool.
Book online at groundswellphysio.janeapp.com — appointments are direct-booking and you don’t need a doctor’s referral in BC.
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