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Stretch activation kinetics of EMB and control jump muscle fibers obtained at 8 mM Pi. (A) Individual stretch activation traces following a 1% ML step over 0.5 ms from control and EMB fibers were fitted to the sum of 3 exponential curves: a3[1-exp(−r3t)] + a2exp(−r2t) + a4exp(−r4t) + offset. Fitted line is shown in black. Rate of phase 2, r2; rate of phase 3, r3; rate of phase 4, r4. (B) r3 of control jump muscles decreased when EMB was expressed (∗P < 0.05, Student’s t-test).
