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Kinetic tracings from muscles stimulated from 1 Hz to 4 Hz (n = 35). Developed force (F dev) increases rapidly and then gradually following an increase in pacing frequency. The switch in frequency is marked by a rapid decline in F dev at approximately 60 seconds. Time to peak tension (TTP) and time to 50% relaxation (RT50) rapidly decline following an increase from 1 to 4 Hz pacing frequency and stabilize within 20 seconds of the frequency change.
