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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Circ Heart Fail. 2015 Mar 4;8(3):595–604. doi: 10.1161/CIRCHEARTFAILURE.114.001585

Figure 1. Hysteresis in plots of force vs [Ca2+]in during the cardiac twitch.

Figure 1

(A) Upon stimulation, [Ca2+]in rises to a peak well before twitch force. (B) Plotting twitch force vs. [Ca2+]in during the time progression of a twitch forms a hysteresis loop. Labels on the loop indicate diastole, A; peak of [Ca2+]in, B; peak of twitch force C. The segments formed between these points are described in the text.