[Analysis of recording of cardiac rhythm and myocardial function after exercise test]. / Analiz izmereniia serdechnogo ritma i funktsional'nogo sostoianiia miokarda pri vypolnenii fizicheskikh nagruzok.

A continuous telemetric registration of the cardiac contraction rate was made in 534 persons performing various physical exertions. The ensuing epxerimental graphs of changes in the rhythm obtained under the effect of physical loads are described by mathematical formulas. Three types of changes in the rhythm in effort have been established, viz. linear, exponential and logarithmic. To determine cardiac function quantitative coefficients, reflecting the rate of the cardiac rhythm coming up to the working level and relationship between the areas of the steady state cardiac contractions frequency phase and that of its rapid increment, are proposed.