Thin myofilaments.
In muscle fibers, thin and thick myofilaments are arranged in specific patterns to create movement. The thin myofilaments are made of actin and the thick myofilaments are made of myosin. During muscle contraction, thick and thin myofilaments slide over each other to create movement.
When a muscle fiber is overstretched, there is insufficient overlap between the thick and thin myofilaments, which can affect the muscle's ability to contract effectively. This reduces force production, and may impair muscle function. In extreme cases, overstretching muscles can lead to muscle damage and injury. It is important to stretch muscles carefully and avoid overstretching to avoid these negative effects.
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