Metabolic and Fatigue Profiles Are Comparable Between Prepubertal Children and Well-Trained Adult Endurance Athletes, 2018, Anthony Birat

Not surprising, as children have more muscle power than adults compared to body mass. Muscle power increases by cross sectional area (i.e. squared), but mass increases by volume (i.e. cubed). So muscle power increases at a slower rate than mass as the body grows. It is one of the major limits on body size.

Same for bone strength too, only increases by the square.
 
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