Principles of Strength and Conditioning
Type I fibers, also known as slow-twitch fibers, are a type of muscle fiber characterized by their endurance and ability to sustain prolonged contractions. These fibers are highly resistant to fatigue and rely primarily on aerobic metabolism, making them essential for activities requiring stamina, such as long-distance running or cycling. The presence of a high number of mitochondria and capillaries in Type I fibers enhances their ability to produce energy efficiently over extended periods.
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