Final answer:
The claim that slow glycolytic fibers are stronger and generally decrease with age is false. Slow-twitch fibers are more associated with endurance and have properties that support sustained activity, while fast glycolytic fibers are stronger and reduce in number as we age.
Step-by-step explanation:
The statement suggesting that slow glycolytic fibers are stronger than other types of fibers and usually decrease with age is false. In fact, there are two primary types of skeletal muscle fibers: slow-twitch (type I) and fast-twitch (type II). Slow-twitch fibers are not generally stronger; they are more endurance-oriented, capable of contracting for extended periods due to their high number of mitochondria, large network of capillaries, and myoglobin content, which supports aerobic metabolism.
Fast glycolytic (FG) fibers, on the other hand, are typically larger in diameter and contain more glycogen, enabling them to produce stronger contractions quickly but fatiguing more rapidly. These fibers primarily use anaerobic glycolysis to generate ATP.