What is the term for rapid rise and fall in force produced by a muscle fiber after single action potential?

The term for rapid rise and fall in force produced by a muscle fiber after single action potential is "twitch."

A twitch is a single, brief contraction of a muscle fiber that occurs in response to a single action potential. It consists of a rapid rise in force followed by a rapid decline. The duration of a twitch can vary from a few milliseconds to several hundred milliseconds, depending on the type of muscle fiber.