RESUMEN
For the purpose of revealing of adaptable possibilities of cardiovascular system research of 150 children of 5-7 years by a method oftetrapolar reography on Kubichek at rest and at mental loading. Research has shown that from 5 to 7 years there are essential changes of parameters of central haemodynamics: increase systolic and diastolic arterial pressure (SAP and DAP), increase stroke volume (SV) and the minute blood volume (MBV), and as decrease heart rate (HR). Mental loading causes two variants of reaction of stroke volume. The first variant was characterized by increase SV, the second - decreaseb SVand increase DAP. Short-term Adaptation to mental loading at the majority of children of 5-7 years independently of and orientation of changes SVwas not accompanied by pressure of regulation's mechanisms of cardiovascular system and had favorable character. At 13-15% of all surveyed children short-term adaptation to mental loading was characterized by considerable pressure of regulation's mechanisms of cardiovascular system. It was expressed in increase the SAP, DAP, HR, GPVR, SPVR, decrease SVand MBV, and also the long period of reconstraction the majority of parameters of central haemodynamics.