Muscle inhibition: Why Your Glutes Won't Switch On (And Why Strengthening Isn't Working)

When muscles become inhibited, they won't contract, it's because your brain has moved it into safe mode, to protect you.

Written by Monica Williams Naturopath | Advanced FSM Practitioner | IICT Member 30+ years in clinical practice | Maroochydore, Sunshine Coast QLD

In short:  If your glutes won't engage no matter how much you exercise, the problem is most likely not weakness — it is your brain deliberately not letting the muscle fire. This is a well-documented neurological response to injury, and no amount of strengthening will override it until the underlying cause is addressed.

This article covers why the brain switches glutes off after injury, why that switch can stay on for years, and how resolving the original tissue injury may finally allow the muscle to come back online.

Key Takeaways

• Gluteal inhibition — also known as gluteal amnesia or arthrogenic muscle inhibition — is a documented neurological phenomenon where the brain reduces or removes the signal to the glute muscles following joint injury or tissue damage

• The brain does this deliberately, to prevent a damaged area from being loaded and torn further — it is a protective mechanism, not a failure

• Standard strengthening exercises cannot override a neurological switch-off — the inhibition must be addressed first

• Old, unresolved inflammation or bruising at the site of a past injury can maintain this inhibition for months or years after the original incident

• In clinical practice, clients have experienced restoration of gluteal activation and significant improvement in gait, stability, and posture following FSM therapy addressing the original tissue injury

1. It's Not Weak. Your Brain Made a Decision.

You've been to the exercise physiologist. You've done the glute bridges, the clamshells, the hip thrusts. You've been told to squeeze and hold, to focus, to activate. The physio or osteo can see the muscle isn't firing properly. And yet, no matter what you do, nothing seems to change.

There is a reason for this — and it has nothing to do with effort or technique.

When the body sustains an injury — a fall, an impact, a strain — the brain makes a rapid, unconscious decision to reduce the neural signal to muscles surrounding the injured area. This is arthrogenic muscle inhibition (AMI), sometimes called gluteal amnesia when it occurs in the glute group. [1]

The brain is not malfunctioning. It is doing exactly what it is designed to do: preventing a damaged tissue from being loaded, contracted, and potentially torn further. The glute switches off to protect you.

The problem is that this protective switch can stay on long after the original injury has healed — or appears to have healed. If the underlying cause of the inhibition is never resolved, the brain never gets the signal to lift the restriction. And no amount of exercise will override a deliberate neurological decision.

2. The Science of Arthrogenic Muscle Inhibition

Arthrogenic muscle inhibition is not a fringe concept. It has been studied for over two decades and is well recognised in rehabilitation science.

A landmark 2022 review titled Arthrogenic Muscle Inhibition: 20 Years On confirmed that AMI is a consistent finding following joint injury and inflammation — and critically, that it acts as a limiting factor in rehabilitation if the inhibition itself is not addressed. [1] Patients can perform exercise diligently and fail to make meaningful progress, because the neural pathway driving the muscle has been downregulated at the source.

A 2025 systematic review confirmed gluteus medius inhibition specifically in patients with hip and ACL injuries, with EMG studies showing reduced muscle activation despite intact muscle tissue. [2] The muscle itself is not damaged — the signal from the brain to the muscle has been reduced or removed.

Research by Dr Stuart McGill and colleagues demonstrated this mechanism directly: measuring glute activity normally, then artificially introducing pain to the hip joint, and finding a significant immediate reduction in glute activation on the affected side. [3] The muscle didn't change. The pain signal to the brain changed the muscle's behaviour.

This is the mechanism. Inflammation or injury signals from the tissue reach the brain, the brain reduces the neural drive to surrounding muscles, and the muscles become inhibited — regardless of how much the person tries to use them.

Professional Insight — Monica Williams, Naturopath & Advanced FSM Practitioner (IICT): What I find most important about this mechanism for clients is the reframe it offers. Years of being told to strengthen, activate, and try harder — when the brain has been quietly preventing the muscle from working — is deeply frustrating and often demoralising. Understanding that this is a protective neurological response, changes everything. And understanding that the solution is to address the original injury signal, not push harder at the exercise, opens a completely different pathway. I have had muscles activated within minutes of the cause being treated. It's very cool. The body never ceases to amaze me with its wisdom and care.

3. How Old Injuries Stay Active

Here is where the picture becomes more complex — and more important.

The brain's inhibitory signal to the glutes is driven by ongoing input from the injured tissue. While there is active inflammation, bruising, or damage at the site, the signal continues. The glutes stay switched off.

In acute injury this resolves over weeks as the tissue heals. But in some cases, old bruising, chronic low-grade inflammation, or scar tissue at the original injury site continues to send the same signal — months or years later. The tissue may not be acutely painful. There may be no obvious sign on imaging. But the signal is still there, and the brain is still responding to it.

This is how a fall eight years ago can still be responsible for glutes that won't fire today.

The person does not connect the two. Why would they? The fall was years ago. The bruising resolved. They recovered — or seemed to. But deep in the tissue, the inflammatory signal persisted. The brain maintained its protective response. And every exercise programme since has been working against a neurological block that was never addressed.

In clinical practice, clients have presented with longstanding gluteal inhibition, gait instability, and postural compensation — tracing back to a fall or impact injury that occurred years prior. When the original tissue injury is addressed directly, gluteal activation has returned, often within a single treatment session. Gait, stability, and posture have stabilised as a direct result.

4. Why Strengthening Alone Can't Fix This

Exercise physiologists, osteopaths, physiotherapists, and massage therapists working with gluteal inhibition are not wrong to focus on activation. They are right that the glutes need to fire.

The limitation is that activation work cannot succeed if the neural inhibition is still in place. You cannot voluntarily override a reflex that is operating below conscious awareness. The brain's protective circuitry does not respond to effort or instruction — it responds to signals from the tissue.

This is why clients can do years of targeted glute work and see minimal change. It is not the programme. It is not the practitioner. It is the order of operations. Until the tissue signal driving the inhibition is resolved, the neural block remains, and the muscle cannot respond.

For allied health practitioners seeing patients who are not progressing despite appropriate exercise prescription, gluteal inhibition from unresolved tissue injury is worth considering — particularly where there is a history of falls, hip or pelvic trauma, or prolonged pain in the region.

5. When This May Be Relevant to You

This approach may be worth exploring if:

• Your glutes won't activate or engage despite consistent exercise

• You have been told you have weak glutes, dead butt syndrome, or gluteal amnesia

• You experience instability when standing, walking, or on uneven ground

• You have lower back pain, hip pain, or knee pain that is not improving with rehabilitation

• Your gait feels unsteady, effortful, or asymmetrical

• You have a history of a fall, impact injury, or hip/pelvic trauma — even years ago

• You have tried physiotherapy, exercise physiology, or osteopathy without meaningful progress

6. How FSM Therapy May Support Recovery

Frequency Specific Microcurrent (FSM) therapy uses gentle, sub-sensory electrical currents paired with specific frequencies to work with the body's tissue repair and nervous system regulation.

In the context of gluteal inhibition, the approach focuses on:

• Resolving old tissue injury — old bruising, chronic inflammation, adhesions and scar tissue at the original injury site can be directly addressed with specific frequency combinations. Research has shown that microcurrent increases cellular energy (ATP) production by up to 500%, supporting the tissue environment needed for resolution. [4]

• Reducing inflammatory signalling — specific frequency pairs have been shown to significantly reduce inflammatory cytokines in tissue. [5] When the inflammatory signal from the injury site reduces, the brain's reason for maintaining the inhibition resolves with it.

• Nervous system regulation — where chronic pain or long-term compensation patterns have affected the broader nervous system response, frequencies supporting nervous system regulation are included in treatment.

• Restoring motor connection — once the inhibition lifts, specific frequencies support the reconnection between the brain's motor centres and the muscle, which can be combined with active movement to re-establish the neural pathway.

The result, when the original injury is the driver, can be rapid. The muscle does not need to be rebuilt — it was never damaged. It simply needs the brain's permission to work again.

For more on what a session involves, the FSM FAQ is a useful starting point. Referrers wishing to discuss a specific client are welcome to contact the clinic directly.

Frequently Asked Questions

Is FSM therapy for gluteal inhibition available in Queensland, Australia?

Yes. Healthier by Choice is located in Maroochydore on the Sunshine Coast, Queensland, and sees clients from across South East Queensland. A free 15-minute phone consultation is available to discuss whether this approach may be appropriate for your situation.

How is FSM different from physiotherapy or exercise physiology for this condition?

Physiotherapy and exercise physiology focus on retraining the muscle — which is the right goal, but requires the neural inhibition to be lifted first. FSM addresses the original tissue injury driving the inhibition. When the two approaches are sequenced correctly — FSM to resolve the tissue injury, followed by targeted rehabilitation to retrain the movement pattern — outcomes can be significantly better than either alone. FSM does not replace your existing allied health team; it addresses what they cannot reach.

Can an old injury really still be causing this?

Yes. Chronic low-grade inflammation, old bruising, and scar tissue can continue to generate the tissue signals that drive arthrogenic muscle inhibition long after an injury appears to have resolved. There may be no ongoing pain at the injury site — but the signal is still present, and the brain is still responding to it. A history of falls, impacts, or hip and pelvic trauma — even years prior — is clinically relevant.

Will I need to continue with rehabilitation after FSM?

In most cases, yes — and this is a good thing. Once gluteal activation is restored, retraining the movement pattern and rebuilding strength and confidence in the muscle is important for lasting results. FSM creates the neurological opening; rehabilitation consolidates it. Many clients benefit from returning to their exercise physiologist or physiotherapist after FSM to make use of the restored activation.

How quickly might I notice a change?

This varies depending on the nature and duration of the original injury and how the nervous system responds. In some cases, clients notice restored gluteal engagement within or immediately following a single session. In others, a series of sessions is needed to fully resolve the tissue injury and allow the inhibition to lift. A free 15-minute phone consultation can help clarify what to expect in your specific situation.

Ready to Talk?

If you — or a client — has been working hard on glute activation without result, and there is a history of injury that may not have fully resolved, it is worth a conversation.

Email us to book your free 15-minute discovery call

Inhibited muscles are in a protected state - when we treat the why, the rest is easy.

About the Author Monica Williams is a naturopath and Advanced FSM practitioner with over 30 years of clinical experience in holistic healthcare. A member of the International Institute for Complementary Therapists (IICT), Monica completed advanced training in Frequency Specific Microcurrent through the Frequency Specific Seminars programme founded by Dr Carolyn McMakin in Sydney. She works with people navigating complex and chronic health conditions at her Maroochydore clinic on the Sunshine Coast, Queensland.

References

[1] Thomas AC, Wojtys EM, Brandon C, Palmieri-Smith RM. Arthrogenic Muscle Inhibition: 20 Years On. Journal of Sport Rehabilitation. 2022;31(6):665–672. View article

[2] Tarchichi T et al. Evidence for arthrogenic inhibition of the gluteus medius after anterior cruciate ligament injury: A systematic review. Journal of Experimental Orthopaedics. 2025. View on PubMed

[3] Freeman S et al. Arthrogenic neuromusculature inhibition: A foundational investigation of existence in the hip joint. Clinical Biomechanics. 2013. View article

[4] Cheng N et al. The effects of electrical currents on ATP generation, protein synthesis, and membrane transport in rat skin. Clinical Orthopaedics and Related Research. 1982;171:264–272.

[5] McMakin CR, Gregory WM, Phillips TM. Cytokine changes with microcurrent treatment of fibromyalgia associated with cervical spine trauma. Journal of Bodywork and Movement Therapies. 2005;9(3):169–176. View abstract

The content in this article is provided for general educational information and is not a substitute for personalised medical or mental health advice, diagnosis, or treatment. Please consult your healthcare provider regarding your individual health needs.