EDG-5506 is a medication being studied to see how it affects certain markers in the body that show muscle damage. This study is focused on people with specific muscle diseases, like Becker Muscular Dystrophy, McArdle Disease, or Limb-Girdle Muscular Dystrophy. The goal is to understand if EDG-5506 can help improve the body’s response to exercise in these conditions.

Sevasemten is another medication being tested in this trial. It is being studied to see if it is safe for people with neuromuscular diseases. Researchers are also looking at how sevasemten affects markers in the body that indicate muscle damage, specifically in people with Becker Muscular Dystrophy, McArdle Disease, or Limb-Girdle Muscular Dystrophy Type 2I. The aim is to see if sevasemten can help reduce muscle damage in these conditions.

Becker Muscular Dystrophy – Becker Muscular Dystrophy is a genetic disorder characterized by progressive muscle weakness and wasting. It primarily affects the skeletal muscles, which are responsible for movement. The disease progresses slowly, with symptoms often appearing in adolescence or early adulthood. Muscle weakness typically begins in the hips and pelvic area, then spreads to the thighs and shoulders. Over time, individuals may experience difficulty walking, climbing stairs, and lifting objects. The progression of muscle weakness can vary widely among individuals.

McArdle Disease – McArdle Disease, also known as Glycogen Storage Disease Type V, is a metabolic disorder affecting muscle metabolism. It is caused by a deficiency of the enzyme myophosphorylase, which is necessary for breaking down glycogen in muscle cells. This leads to an inability to produce energy during exercise, resulting in muscle pain, cramps, and fatigue. Symptoms typically appear during childhood or adolescence and are often triggered by physical activity. The disease progresses with repeated episodes of muscle pain and potential muscle damage. Some individuals may develop a second wind phenomenon, where symptoms improve after a brief rest during exercise.

Limb-Girdle Muscular Dystrophy – Limb-Girdle Muscular Dystrophy is a group of genetic disorders characterized by progressive muscle weakness and wasting, primarily affecting the shoulder and hip areas. The disease can begin in childhood or adulthood, with varying rates of progression. Muscle weakness typically starts in the proximal muscles, such as those around the hips and shoulders, and may later affect the distal muscles. As the disease progresses, individuals may experience difficulty with activities such as walking, running, and lifting objects. The severity and progression of symptoms can vary significantly among individuals. Different genetic mutations are responsible for the various subtypes of this condition.