Orlov R S, Krol' T M, Poliak S B
Fiziol Zh SSSR Im I M Sechenova. 1977 Jun;63(6):872-80.
Chrono-ionotropic interrelationships were studied in isolated strips of the myocardium of poikilothermous animals (frogs and fishes) in conditions of either stationary or transitional regimens of stimulation. In the stationary regimen, the rhythm-strength relation is simple and corresponds to a parabolic curve. While changing the lesser frequency of stimulation for greater one, both the positive and negative transitional abbreviating stirs were observed, in contrast to literature references. The phenomena of positive and negative transitional stairs were concluded to be unrelated to species while being a general biological form of the myocardium response to change of the stimulation rhythm.
在变温动物（青蛙和鱼类）离体心肌条的静止或过渡刺激方案条件下，研究了时间离子otropic相互关系。在静止方案中，节律强度关系简单，对应于抛物线曲线。与文献参考不同的是，当将较小的刺激频率改变为较大的刺激频率时，观察到了正向和负向过渡性缩短刺激。正向和负向过渡阶梯现象被认为与物种无关，而是心肌对刺激节律变化反应的一种普遍生物学形式。
