Bowditch effect

The Bowditch effect (Treppe effect, staircase phenomenon) is one of the mechanisms of homeometric regulation of the heart.
 * At a higher heart rate, the sodium-calcium pump is not enough to pump Ca 2+ ions out of the cell to the original.
 * Their concentration gradually increases, which is manifested by positive inotropy (increased force of contraction).

Related articles

 * Homeometric regulation of the heart
 * Frank-Starling mechanism