Immediately after a muscle fiber is stimulated by a nerve — when calcium ions are flooding into the sarcomeres to pull away those two protein bodyguards of tropomyosin and troponin from the actin — that's called the latent period.

肌肉纤维被神经刺激后立即——钙离子涌肌节，将肌动中保护原肌球和肌钙质带走——这称为潜伏期。