Type 1 muscles are capable of generating the most energy due to the presence of more Mitochondria and an increased rate in Aerobic cellular activity.
- There are two types of skeletal muscle fibers: slow-twitch (Type I) and fast-twitch (Type II).
- Longer durations of time require increased efficiency from type I muscle fibers.
- They are mostly utilized for exercises that require endurance or posture maintenance (such as holding the head up straight) (like marathon running).
- Possess an abundant supply of capillaries, a large number of mitochondria and aerobic respiratory enzymes, and a significant amount of myoglobin.
- Myoglobin, a crimson pigment that resembles hemoglobin found in red blood cells, helps the slow-twitch fibers receive more oxygen.
- The term "red fibers" is also used to describe slow-twitch fibers due to their high myoglobin concentration.
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