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Basal Mg2+-dependent and Ca2+-stimulated myofibrillar ATPase activities are shown in Control, Ca2+-depleted, and Ca2+-paradox ventricles
| Group | Control | Ca2+-depletion | Ca2+-paradox |
|---|---|---|---|
| (n = 7–9) | |||
| ATPase activity | |||
| Basal (Mg2+), µmol Pi/mg protein/h | 3.20 ± 0.25 | 3.27 ± 0.10 | 7.21 ± 0.36*,# |
| Ca2+-stimulated, µmol Pi/mg protein/h | 12.08 ± 0.57 | 8.13 ± 0.19* | 8.40 ± 0.22* |
Data are given as mean ± SEM
*P < 0.05 versus Control; # P < 0.05 versus Ca2+-depletion
