Which of the following is not a component of the stretch-shortening cycle?

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The stretch-shortening cycle is defined by three phases in sequence: an eccentric loading phase where the muscle-tendon unit is stretched, a brief amortization (transition) pause, and a concentric shortening phase where force is produced. Elastic energy storage happens during the eccentric stretch in the tendinous elements and is then released during the concentric action. But it is not a separate phase or component of the cycle itself—it’s a mechanism that enhances the subsequent concentric force. Therefore, elastic energy storage is not considered a distinct component of the cycle, making it the best answer. The other options—eccentric, amortization, and concentric—are the actual phases of the cycle.