The Journal is included in Russian and International Library and Abstract Databases:
Russain Science Index (Russia)
Electronic Library (Russia)
DOI Registration Agency (USA)
Ulrich's Periodicals Directory (USA)
Scientific Indexing Services (USA)
InfoBase Index (India)

PROGNOSTIC POSSIBILITIES OF THE CARDIAC RHYTHMGRAM DURING EXERCISE

A.L. POKHACHEVSKIY, Y.M. REKSHA, D.A. FALEEV, S.S. SSORIN, S.M. SMOLEV, S.V. STROILOV ACADEMY OF THE FPS OF RUSSIA, RYAZAN, RUSSIA

Objective: to study distribution of differences in successive RR intervals (Ras) of the cardiac rhythmgram for the 1–3 minutes of load testing and their relation to the PE tolerance to reveal laws of its elaboration.
Materials and Methods: we examined a mixed population (68 persons) of apparently healthy high-school children and students, 36 of them are current champions and 32 do nothing with a systematic physical loads. We performed maximal ergometry testing, results of which: Ras and maximal performance of the left ventricle (PLV), calculated according to the formula: (W / HR) × 100, where HR is the heart rate at the peak of loading, and W is the maximal load in Watts, are analyzed using comparative (Mann-Whitney) and correlation (Spearman) methods.
Results: characteristic features of interrelation of the PE tolerance maximum are determined, firstly, by the presence of the central range of cardio intervals (inverse relationship with PE tolerance) limiting the loading tolerance, and two peripheral ranges (to the left and to the right) from the central one, cardio intervals of which realize the maximum of the tolerance (direct relation to the tolerance). At that, the central range of values is narrowed from the 1 to the 3 minute of loading, and peripheral ones are widened. High level of aerobic/anaerobic endurance at preserving the trends of a mixed population shows their most vivid accentuation. At that, the maximally wide limiting range of the 1 minute (12 values) is more than twice as much concentrated by the 3 minute (6 values), while the minimal range of realizing values appears by the 2 minute and substantially increases by the 3 one.
Conclusions: distribution of differences of cardio intervals at early stages of adaptation to PE has its defining characteristics that determine its maximal tolerance.
Keywords: 
heart beat lability; criteria; markers; loading tolerance; cardiac rhythmgram; maximal load test.