What type of metabolism do Type I muscle fibers predominantly use?

Type I muscle fibers, also known as slow-twitch fibers, predominantly utilize oxidative metabolism. This type of metabolism relies on aerobic pathways to convert nutrients into energy, making these fibers particularly efficient for sustained and endurance activities. Type I fibers are rich in mitochondria and myoglobin, which facilitate oxygen delivery and utilization, allowing them to generate ATP through the oxidation of carbohydrates and fats over extended periods.

Their primary function is to support activities that require endurance, such as long-distance running or cycling, rather than quick bursts of power or strength. This characteristic aligns with the physiological role of Type I fibers, as they are designed for prolonged, low-intensity activities rather than short, high-intensity efforts, which would rely more on other types of metabolic processes.