Final answer:
The claim that type I fibers are lost more with aging than type II fibers is false. Aging is more associated with a decline in type II fibers, which are responsible for quick, powerful contractions.
Step-by-step explanation:
The statement that the loss in the number and size of type I fibers occurs more than the loss of type II fibers with aging is false. Aging causes a condition known as sarcopenia, which leads to a general decline in muscle mass and strength. However, this condition is associated with a reduction in fast glycolytic (FG) fibers, which are type II fibers, not type I. FG fibers hydrolyze ATP quickly to produce short, powerful contractions. On the other hand, type I fibers, also known as slow oxidative (SO) fibers, are more resistant to aging and can increase in number as we age. SO fibers are responsible for endurance and can contract for extended periods due to a large number of mitochondria and high levels of the oxygen-binding protein myoglobin.