Is it Safe to Exercise and Lift Weights with FSHD?

Yes, it is generally safe and highly recommended to exercise and lift weights if you have Facioscapulohumeral muscular dystrophy (FSHD) ^[1][2]. For a long time, patients were warned against physical activity due to a fear of “overwork weakness”—the idea that using your muscles too much would accelerate muscle damage or permanently wear them out ^[3][4]. Modern research has disproven this. Studies show that moderate-intensity aerobic and strength training do not dangerously elevate creatine kinase (CK)—a protein that leaks into the blood when muscle is damaged—nor do they speed up the progression of FSHD ^[3][5].

The Myth of “Wearing Out” Your Muscles

A common fear among people with FSHD is that they have a limited amount of muscle tissue left, and exercise will “use it up” or destroy the muscle’s ability to repair itself. However, clinical studies show that FSHD muscle maintains a functional regenerative response to exercise ^[1].

When you exercise, your body relies on satellite cells, which are specialized stem cells that help repair and grow muscle fibers. Research into combined aerobic and strength training for FSHD patients shows that exercise actually expands this satellite cell pool without exhausting the muscle’s regenerative capacity or shortening its lifespan ^[1][2].

A Note on Expectations: While exercise maximizes the health and efficiency of your existing functional muscle, it cannot reverse or rebuild muscle tissue that has already been permanently replaced by fat and connective tissue. Exercise will not cure the disease, but staying active prevents general deconditioning and protects the muscle function you currently have ^[1].

The Benefits of Staying Active

Participating in a regular, well-designed exercise program provides several significant benefits for people with FSHD:

• Improved Fitness and Endurance: Moderate-intensity aerobic exercise, like cycling, improves cardiorespiratory fitness, walking speed, and overall functional capacity ^[5][1].
• Reduced Fatigue: Fatigue is one of the most common and debilitating symptoms of FSHD. Regular aerobic training is an evidence-based therapy to help reduce these feelings of exhaustion ^[6]. It is normal to feel a temporary increase in fatigue when starting a new routine, but consistency typically leads to more energy over time.
• Inclusive Options: If lower body weakness is an issue, upper limb exercises like arm cycling (arm ergometry) are safe, appropriate options that can help manage daily symptoms ^[7].

How to Exercise Safely with FSHD

While exercise is safe and beneficial, standard clinical care for FSHD focuses heavily on symptom management, meaning your routine must be tailored to your specific physical abilities ^[8].

Here are the best practices for exercising safely:

• Work with a Specialist: Approximately 85% of FSHD patients experience shoulder instability that affects daily living ^[7]. Because of this, it is highly recommended that you design your routine alongside a physical therapist who specializes in neuromuscular diseases.
• Adapt for Upper Body Weakness: If you have severe scapular winging (where the shoulder blades stick out), avoid heavy overhead lifting, as it forces other muscles to overcompensate and can cause severe pain. Aquatic therapy (exercising in a pool) can be an excellent alternative, as the water’s natural buoyancy supports unstable joints ^[9].
• Focus on Moderate Intensity: Start with low to moderate intensity and gradually increase it. A common, well-studied approach is 30 minutes of aerobic exercise (like a stationary bike) three times a week ^[5].
• Be Cautious with Eccentric Lifting: While strength training is safe ^[1], experts generally recommend avoiding heavy eccentric loading. This is the phase of an exercise where a muscle lengthens under tension—such as walking downhill, doing deep heavy squats, or slowly lowering a heavy dumbbell. These movements are much more likely to cause micro-tears in the muscle. Focus on controlled, moderate resistance instead.
• Watch for Medical Emergencies: Exercise should not leave you completely drained or in severe pain for days. If you experience dark, tea- or cola-colored urine, this is a medical emergency. It is a sign of severe muscle breakdown (rhabdomyolysis) and can lead to acute kidney failure. Seek emergency medical care immediately if this occurs.