Matrix Analysis of ECG Parameters May be a Way to Improve Quality of Functional State Monitoring during Exercising

Abstract

Research background. The aim of this study was to compare the peculiarities of dynamics of cardiovascular
functional state indices during bicycle ergometry by applying the steep or slow increase in workload.
Methods. Twenty five  males attending health promotion sport clubs took part in two cardiovascular testing
procedures performing graded exercise stress, i.e. increasing the workload every min, and increasing the workload
every 6 min. They exercised till the inability to continue the task or when distressing cardiovascular symptoms
supervened. 12 Lead ECG was recovered and analysed.
Results. The steep increase of registered cardiovascular parameters was observed at onset of exercising and the
rate of it depended on the increase rate in workload. Registered maximal changes of heart rate, JT interval, and the
ratio JT/RR as a functional state index at the moment of refusing to continue the graded exercise test were of the
same level while applying the steep or slow increase in workload.
Conclusions. The rate of increase in workload determines the mobilization rate but not the degree of increase
of ECG parameters. Maximal changes of heart rate, JT interval, and the ratio JT/RR as functional state index at the
moment of refusing to continue the graded exercise test were the same level while applying the steep or slow increase
in workload.

Keywords:  cardiovascular system, graded exercise stress, functional state.