What type of muscle fibers are characterized by slow contraction, low force, and high resistance to fatigue?

What type of muscle fibers are characterized by slow contraction, low force, and high resistance to fatigue?

• A. Type 1
• B. Type 2 A
• C. Type 2 B
• D. Fast twitch

Answer: (A)

Type 1 muscle fibers, also known as slow-twitch fibers, are indeed characterized by their slow contraction speed, low force production, and high resistance to fatigue. These fibers are highly efficient in using oxygen to generate energy, making them particularly suitable for endurance activities. They contain a high number of mitochondria and are rich in myoglobin, which allows them to sustain prolonged periods of activity without fatigue. Athletes engaged in long-distance running, cycling, or any endurance sport predominantly rely on these fibers. The physiological properties of Type 1 fibers enable them to support activities that require sustained effort without quick bursts of power, which would instead rely on other types of fibers. This distinction is crucial for understanding how different types of muscle fibers contribute to various physical performance aspects.

Type 1 muscle fibers, also known as slow-twitch fibers, are indeed characterized by their slow contraction speed, low force production, and high resistance to fatigue. These fibers are highly efficient in using oxygen to generate energy, making them particularly suitable for endurance activities. They contain a high number of mitochondria and are rich in myoglobin, which allows them to sustain prolonged periods of activity without fatigue.

Athletes engaged in long-distance running, cycling, or any endurance sport predominantly rely on these fibers. The physiological properties of Type 1 fibers enable them to support activities that require sustained effort without quick bursts of power, which would instead rely on other types of fibers. This distinction is crucial for understanding how different types of muscle fibers contribute to various physical performance aspects.