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. 1997 Mar 1;109(3):385–399. doi: 10.1085/jgp.109.3.385

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Real and Ca²⁺-derived force of Xenopus fibers in control and at the end of phase 2. Records obtained from a type 1 fiber in control (A) and at the end of phase 2 (B). Records with higher noise level represent Ca²⁺-derived force. Dashed lines indicate end of tetanic stimulation. Measurements were performed at 70% of the tetanic force (horizontal lines); t₁ represents the calcium component, and t₂ represents the cross-bridge component of relaxation. C shows collected data (mean ± SEM; n = 7) of the relative time of real force relaxation (t₁ + t₂, •) and relaxation of the calcium component (t₁, ▾). The relaxation time of real force in control was in each experiment set to 100%.