Prolonged,low intensity exercise uses mainly ______ muscle fibers.

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Prolonged, low intensity exercise uses mainly slow-twitch Type I muscle fibers, which are red in color due to their high concentration of oxygen-carrying myoglobin. These fibers have a high endurance capacity and can maintain their contractions for extended periods of time without fatigue. Type IIX fibers, on the other hand, are fast-twitch fibers that are better suited for short bursts of high-intensity exercise, while Type IIA fibers have characteristics of both Type I and Type IIX fibers. White muscle fibers are not a recognized type of muscle fiber.

Prolonged,low Intensity Exercise Uses Mainly ______ Muscle Fibers