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The Ca uptake of the SR of a skinned fibre, which was studied with an indirect method, shows a biphasic time course. A total Ca concentration between 8 and 23 mᴍ was accumulated in the SR by an initial fast process (τ ≈ 4.7 s). This Ca-uptake activity of the SR is high enough to bring about relaxation o f twitch contraction in vivo. The magnitude of a subsequent slow process (τ ≈ 10 3 s) indicates that the total Ca storage capacity of the SR of skeletal muscle is in the order of 60 - 75 mᴍ.

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Electromechanical Coupling III. Estimation of the Ca Storage Capacity of the SR by Analysing the Time Course of Caffeine- Induced Tension Transients of Skinned Muscle Fibres