Strength in kids with Duchenne muscular dystrophy is described as increasing until age 7 and then declining to age 14. At what ages do these changes occur?

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Multiple Choice

Strength in kids with Duchenne muscular dystrophy is described as increasing until age 7 and then declining to age 14. At what ages do these changes occur?

Explanation:
In Duchenne muscular dystrophy, strength tends to increase with growth up to about early school age, then decline as the disease progresses into adolescence. This pattern places the peak strength around age 7 and a notable decline by about age 14. This reflects the natural history: children may gain strength with growth until that around 7-year point, after which proximal muscle weakness accelerates, leading to reduced strength and functional decline by mid-teens. Therefore, the changes occur at about 7 and 14.

In Duchenne muscular dystrophy, strength tends to increase with growth up to about early school age, then decline as the disease progresses into adolescence. This pattern places the peak strength around age 7 and a notable decline by about age 14. This reflects the natural history: children may gain strength with growth until that around 7-year point, after which proximal muscle weakness accelerates, leading to reduced strength and functional decline by mid-teens. Therefore, the changes occur at about 7 and 14.

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