If a second stimulus arrives before the relaxation phase has ended, a second, more powerful contractionoccurs. This addition of one twitch to another is called

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Wave summation describes the addition of one twitch to another when a second stimulus arrives before the relaxation phase has ended. This results in a more powerful contraction than a single twitch. Incomplete tetanus occurs when there is partial relaxation between contractions, while complete tetanus is a sustained contraction with no relaxation. Treppe describes the phenomenon of progressively stronger contractions due to increasing Ca2+ availability, and recruitment refers to the activation of additional motor units to increase muscle force.

If a Second Stimulus Arrives Before the Relaxation Phase Has