Muscular Dystrophy: When Muscles Wear Out From Being Used

We tell our children, "Go and play. Your muscles will become strong." For almost every child, that is exactly how it works. Every run, every climb, every jump makes the muscle a little tougher.

But for a small group of children, this rule quietly turns upside down. Their muscles are doing precisely what we ask of them, and that very work is wearing them out.

That is muscular dystrophy. And to understand it, I want you to think of a tabla.

The tabla without its straps

A tabla takes thousands of strikes in a single concert. Why doesn't the leather tear? Because it is laced tightly to the wooden body with leather straps. Every beat is shared by the whole drum.

Now imagine a tabla built without those straps. It still plays. But every beat now lands on the same small patch of leather, and slowly, tiny splits begin.

Our muscles have straps too. Each muscle fibre is a long cell wrapped in a thin skin, its membrane. A protein called dystrophin ties the pulling machinery inside the fibre, through that membrane, to the supporting net outside. In Duchenne muscular dystrophy, the body cannot make dystrophin. The muscle still contracts. It simply has nothing to spread the force.

What is muscular dystrophy?

Muscular dystrophy is a group of inherited conditions in which a muscle protein is missing or faulty. The muscle gets damaged by its own normal work and, over years, is replaced by fat and scar tissue. It is not caused by diet, lack of exercise, an infection, or anything a mother did during pregnancy.

There are several types. Duchenne is the most common one in childhood, affecting roughly 1 in 5,000 boys born worldwide¹. Becker is its milder cousin, caused by the same gene but with some working dystrophin. Myotonic dystrophy is the most common type in adults, and it looks quite different: the grip is slow to let go after a handshake.

Here is what happens inside, step by step. Each contraction makes tiny tears in the membrane. Calcium leaks in and switches on the cell's own breakdown machinery. The body's repair cells rush in and patch the fibre.

Now, think about it. The repair crew never quits. It simply runs out. Slowly, fat and scar tissue take the place of muscle. That is why some of these boys have big, firm calves and yet struggle to climb stairs. The calf looks strong. It is mostly stuffing.

Why does it mostly affect boys?

The dystrophin gene sits on the X chromosome. Girls have two X chromosomes, so if one copy is faulty, the other usually covers for it. Think of it as a car with a spare tyre. Boys have only one X, with no spare.

That is why a mother can carry the gene silently and her son can show the condition. But please do not turn this into blame. In about one in three boys, the change appears fresh, with no family history at all. And carrier women are not always completely unaffected: some develop heart muscle problems, so they deserve heart check-ups too.

What are the early signs?

In Duchenne, signs usually appear between two and five years of age: walking late, falling often, difficulty running or climbing stairs, a waddling walk, big firm calves, and a typical way of getting up from the floor by pushing the hands up along the knees and thighs.

That last sign has a name, Gowers' sign. Say, for example, a four-year-old is sitting on the floor and wants to stand. He turns onto his hands and knees, pushes his hips up, puts his hands on his knees, and then walks his hands up his own thighs. He is using his body as a ladder, because the hip muscles, the lift, are not doing their job.

By the way, one simple blood test, CK (creatine kinase), is often very high in these children, because damaged muscle leaks it into the blood. Sometimes a child is investigated for "liver problems" because liver enzymes are also raised, when the enzymes are actually coming from muscle. A doctor who suspects muscle can check CK and then confirm the exact type with a genetic test.

Can it be treated?

There is no treatment yet that fixes the missing protein completely. But care has changed the story. Steroid medicines slow the muscle loss, and heart care, breathing support and physiotherapy have helped many young men live well into adulthood.

International care guidelines describe daily steroids as the standard of care², delaying loss of walking by a few years on average, with careful watch on weight, bones and growth. Heart and breathing muscles are monitored from early on, because heart muscle disease develops in most young men with Duchenne³, often without symptoms at first.

Newer gene-targeted treatments exist for some specific gene changes. They are promising, but early, expensive and not widely available in India. They also carry real risks: in 2025, the US regulator restricted the use of one gene therapy⁴ after reports of fatal liver injury. So when you read a headline about a "breakthrough", read it with hope and with a question mark.

What families can actually do

This is where everyday life matters. Gentle, regular activity like swimming, cycling and play is helpful. Heavy straining and exercise to exhaustion are not. Here is something surprising: walking downstairs is harder on these muscles than walking upstairs, because the muscle is lengthening under load. The tabla takes the hardest beat on the way down.

Food has a role too, not to replace dystrophin, but to protect the body carrying it. In the early years, steroids and less movement can add weight that tired muscles must carry. Later, as swallowing and breathing get harder, weight loss becomes the concern. Bones need calcium and vitamin D throughout. Care guidelines⁵ include a dietitian in the team for exactly this reason.

Some muscles are not weak. They are working without their straps.

So the next time you see a little boy on the floor, climbing up his own legs to stand, don't brush it off as clumsiness, and don't panic either. Just notice. Then ask a doctor one simple question.

A question asked early opens more doors than an answer that comes late.

Educational information only, not diagnosis, treatment or emergency care. Please speak to a qualified doctor before changing medicines, diet or treatment.