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. 2021 Dec 16;14(12):dmm049006. doi: 10.1242/dmm.049006

Fig. 4.

Fig. 4.

Characterization of the kinetics properties of tetanic contraction. (A) An illustrative tracing of the force during isometric tetanic contraction. The start and end of electric stimulation were marked by a gray dashed line and a solid gray line, respectively. 50% Po, half absolute tetanic force. (B) Quantitative comparison of Po. (C) Quantitative comparison of sPo. (D) Quantitative comparison of TPT. (E) Quantitative comparison of half-relaxation time. (F) An illustrative tracing of the velocity during isometric tetanic contraction. Max df/dt, maximum rate of force development during the contraction phase; max −df/dt, maximum rate of force reduction during the relaxation phase; time-to-max df/dt, time from the start of contraction to mdx df/dt; time-to-max −df/dt, time from the end of electric stimulation to mdx −df/dt. (G) Quantitative comparison of max df/dt. (H) Quantitative comparison of max −df/dt. (I) Quantitative comparison of time-to-max df/dt. (J) Quantitative comparison of time-to-max −df/dt. Sample size: normal (n=15) and affected (n=15). Data are mean±s.d. *P<0.05 (statistical analysis was performed using unpaired Student’s t-test for B-E and G-J).