Enoka (2008, p. 340) only mentions PTP and states: “The magnitude of the twitch force is extremely variable and depends on the activation history of the muscle. A twitch elicited in a resting muscle does not represent the maximum twitch. Rather, twitch force is maximal fol-lowing a brief tetanus […].” Here it is important to understand the difference between a twitch contraction and tetanic contraction. While a twitch contraction is a transient rise and fall of force following a single activation, a tetanic contraction (tetanus) occurs with sequential acti-vations of the muscle at an interval that is short enough to prevent the complete relaxation between mechanical responses (MacIntosh, 2010, p. 317). Therefore, the term staircase is also
