Fig. 3.

Effects of 3 mM [Ca²⁺]_o and ISO on Ca²⁺ transient decline with matched peaks. A: pooled data (means ± SE) of Ca²⁺ decline with 3 mM [Ca²⁺]_o (black) or ISO (gray). RT₂₅, RT₇₅, and RT₉₀, the time it takes the Ca²⁺ transient to decline by 25, 75, and 90%, respectively, from its peak amplitude. B: pooled data (means ± SE) of Ca²⁺ transient decline time intervals with 3 mM [Ca²⁺]_o or ISO. RT_50-25, the time for Ca²⁺ to decline 25% from the peak amplitude to the 50% point; RT_75-50, the time for Ca²⁺ to decline 50% from the peak amplitude to the 75% point; RT_90-75, the time for Ca²⁺ to decline 75% from the peak amplitude to the 90% point. *P < 0.05 vs. corresponding 3 mM [Ca²⁺]_o (n = 21 cells/10 hearts).